JP2009160638A - Joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method where a butted part between metal members is subjected to friction stir welding from the front surface side and the rear surface side, and the airtightness and watertightness of the metal members can be improved. <P>SOLUTION: The method has: a first final joining step for applying friction stirring from a front surface A of the metal member 1 to be joined; a second final joining step for applying friction stirring from a rear surface B of the metal member 1 to be joined; a repair material inserting step for inserting a void part repair member U2 and a void part repair member U3 into a groove hole formed at the side face of the metal member 1 to be joined; and a side face final joining step subjecting a butted part to friction stirring from the side faces of the metal member 1 to be joined. In the side face final joining step, an unplasticized region between a front surface side plasticized region W1 and a rear surface side plasticized region W2 are subjected to friction stirring, and further, butted parts between the void part repair members U2, U3 and the surface side plasticized region W1 and the rear surface side plasticized region W2 are subjected to friction stirring. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for joining metal members using friction stirring.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a process of rotating a rotating tool along the abutting portion between metal members, and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member, so that the metal members are solid-phased. It is what is joined. In general, the rotating tool is formed by protruding a stirring pin (probe) on the lower end surface of a shoulder portion having a cylindrical shape.

11 and 12 are perspective views showing a conventional joining method in which friction stir welding is performed on a pair of metal members. As shown in FIG. 11, when the thickness of the metal members 101, 101 to be joined is larger than the length of the stirring pin of the rotating tool (not shown), after performing the friction stir welding from the surface 102 side of the metal member 101. In some cases, friction stir welding is also performed from the back surface 103 side.
That is, in the conventional joining method, the friction stir welding is performed from both sides of the front surface 102 and the back surface 103 along the abutting portion 104 (two-dot chain line) of the metal members 101, 101, and the plasticized region 105 formed by the friction stir welding is formed. , 106 are joined so that the central portions in the thickness direction are in contact with each other. Thereby, in the butt | matching part 104, it can join without a clearance gap.

Japanese Patent Laying-Open No. 2005-131666 (see FIG. 7)

  However, in the conventional example shown in FIG. 11, in the plasticized regions 105 and 106, there is a possibility that a cavity defect 109 continuous from one side surface 107 to the other side surface 108 occurs. Such a tunnel-like cavity defect 109 contributes to a decrease in watertightness and airtightness between the side surface 107 and the side surface 108 of the metal members 101 and 111.

  On the other hand, as shown in FIG. 12, when the thickness of the metal members 111 and 111 to be joined is large, even if friction stir welding is performed from the front surface 102 and the back surface 103, the center portion of the abutting portion 104 (two-dot chain line) is not formed. There is a possibility that a plasticized region will occur. That is, when the thickness of the metal member 111 is very large with respect to the length of the stirring pin of the rotating tool (not shown), even if friction stirring is performed from the front surface 102 and the back surface 103 of the metal member 111, the plasticizing region 105 is obtained. , 106 cannot be brought into contact with the central portion in the thickness direction, and a gap (unplasticized region 119) is generated in the central portion of the abutting portion 104. Thus, when the unplasticized area | region 119 which continues from the one side surface 107 to the other side surface 108 arises, there existed a problem that the watertightness and airtightness between the side surface 107 and the side surface 108 fell further.

  Here, if the length of the stirring pin of the rotary tool is increased in accordance with the thickness of the metal member 111, it is possible to join the metal members 111 without gap by performing friction stir welding from the front surface 102 and the back surface 103. is there. However, since the rotating tool moves while the stirring pin is buried in the metal member 111 and rotates at a high speed, if the length of the stirring pin is increased, the load acting on the driving means of the friction stirrer and the stirring pin increases. However, there is a problem that the life of the apparatus is shortened.

  From such a point of view, the present invention provides a joining method capable of performing friction stir welding of abutting portions between metal members from the front surface side and the back surface side of the metal members and improving the air tightness and water tightness of the metal members. The issue is to provide.

  A joining method according to the present invention that solves such a problem is a joining method in which friction agitation is performed on a metal member to be joined that is formed by abutting a pair of metal members, and is formed at a mating portion of the pair of metal members. On the other hand, a first main joining step in which friction stirring is performed from the surface of the metal member to be bonded, a second main bonding step in which friction stirring is performed from the back surface of the metal member to be bonded to the abutting portion, and the metal to be bonded. In the side surface of the member, a cavity is formed in a cavity defect formed in at least one of the front side plasticization region formed in the first main joining step and the back side plasticization region formed in the second main joining step. A cavity repair member inserting step for inserting a repair member, and a side main joining step for performing frictional stirring on the abutting portion from the side surface of the metal member to be joined. Plasticization Friction stir of the unplasticized region between the region and the back side plasticized region, and at least one of the front side plasticized region and the back side plasticized region, and the butt portion of the cavity repair member Is characterized by friction stirring.

  According to such a joining method, the cavity repair member is inserted into the cavity defect formed on the side surface of the metal member to be joined to close the cavity defect, and the cavity part repair member and the surface side plasticization are performed in the side surface main joining process. Since the abutting portion between the region and the back side plasticizing region is frictionally stirred, the airtightness and watertightness of the metal member to be joined can be improved.

  Further, in the cavity repair member insertion step according to the present invention, in the side surface of the metal member to be joined, around the cavity defect formed in at least one of the front side plasticization region and the back side plasticization region It is preferable to include a slot forming step of forming a slot by cutting and inserting the cavity repair member into the slot. According to such a joining method, the cavity repair member can be preferably inserted.

  Moreover, this invention is a joining method which carries out friction stirring with respect to the to-be-joined metal member formed by abutting a pair of metal members, Comprising: The surface of the to-be-joined metal member with respect to the abutting part of a pair of said metal member A first main joining step in which friction agitation is performed, a second main joining step in which friction agitation is performed from the back surface of the metal member to be bonded to the abutting portion, and a side surface of the metal member to be bonded. A weld metal filling step of filling a weld metal into a cavity defect formed in at least one of the front side plasticization region formed in the joining step and the back side plasticization region formed in the second main joining step; A side main joining step in which friction agitation is performed from the side surface of the metal member to be joined to the abutting portion, and the side main joining step is performed between the front side plasticizing region and the rear side plasticizing region. Unplasticized area With friction stir and wherein one at least one of the surface plasticized region and the back-side plastic region, to stir friction interface between the weld metal.

  According to such a joining method, the weld metal is filled in the cavity defect formed on the side surface of the metal member to be joined to close the cavity defect, and the weld metal, the surface side plasticized region, and the back surface are filled in the side surface main joining process. Since the interface with the side plasticized region is frictionally stirred, the airtightness and watertightness of the metal member to be joined can be improved.

  In the weld metal filling step according to the present invention, the periphery of a cavity defect formed in at least one of the front surface side plasticized region and the back surface side plasticized region on the side surface of the metal member to be joined is cut. It is preferable to include a slot forming step of forming a slot, and to fill the slot with the weld metal. According to such a joining method, the weld metal filling step can be easily performed.

  Moreover, this invention is a joining method which carries out friction stirring with respect to the to-be-joined metal member formed by abutting a pair of metal members, Comprising: The surface of the to-be-joined metal member with respect to the abutting part of a pair of said metal member A first main joining step in which friction agitation is performed, a second main joining step in which friction agitation is performed from the back surface of the metal member to be bonded to the abutting portion, and a side surface of the metal member to be bonded. A recess forming step for forming a recess in an unplasticized region between a front side plasticized region formed in the joining step and a back side plasticized region formed in the second main joining step; and a recess repairing member in the recess A recess repairing member insertion step for inserting the recess, and a side main joining step for performing frictional stirring on the abutting portion between the recess repairing member and the one metal member and the abutting portion between the recess repairing member and the other metal member And including To.

  According to this joining method, the recessed portion repair member is inserted into the recessed portion formed in the unplasticized region that appears on the side surface of the bonded metal member, and the abutting portion between the recessed portion repair member and the bonded metal member is frictionally stirred. Thereby, the watertightness and airtightness of a to-be-joined metal member can be improved.

  Further, a slot forming step of cutting a periphery of a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region according to the present invention to form a slot, and the slot A cavity repair member insertion step of inserting a cavity repair member into the cavity, and at least one of the front surface side plasticization region and the back surface plasticization region and the abutting portion of the cavity repair member It is preferable to carry out friction stirring.

  According to this joining method, the cavity repair member is inserted into the cavity defect formed in at least one of the front surface side plasticized region and the back surface side plasticized region to close the cavity defect, and the cavity Since the abutment portion between the part repair member and the front side plasticization region and the back side plasticization region is frictionally stirred, the airtightness and water tightness of the metal member to be joined can be improved.

  Further, a slot forming step of cutting a periphery of a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region according to the present invention to form a slot, and the slot A cavity part repairing member inserting step of inserting a cavity part repairing member into the entire surface of the abutting part of the cavity part repairing member and at least one of the front surface side plasticizing region and the back surface plasticizing region It is preferable to carry out friction stirring over the entire time.

  According to such a joining method, the cavity repair member is inserted into the cavity defect formed in at least one of the front surface side plasticized region and the back surface side plasticized region to close the cavity defect, and Since the entire abutting portion between the cavity repair member and the front side plasticization region and the back side plasticization region is frictionally stirred, the airtightness and water tightness of the metal member to be joined can be further improved.

  Moreover, it is preferable that the said side main joining process based on this invention moves a rotary tool in the way of one-stroke writing. According to this joining method, the workability of friction stirring can be improved.

  In the present invention, it is preferable that the rotary tool used in the side main joining step is smaller than the rotary tool used in the first main joining step and the second main joining step. According to such a joining method, a small rotating tool has a relatively small turn, so that the operability of the rotating tool can be improved.

  Moreover, it is preferable that this invention includes the temporary joining process of temporarily joining the said butt | matching part before performing at least 1 process of said 1st main joining process, said 2nd main joining process, and side surface main joining process. According to this joining method, it is possible to prevent the opening of the metal members when performing frictional stirring.

  Moreover, it is preferable that this invention includes a tab material temporary joining process which arrange | positions a pair of tab material on the both sides of the said abutting part, and temporarily joins the abutting part of the said tab material and the said to-be-joined metal member. According to this joining method, it is possible to prevent the opening between the tab material and the metal member to be joined when the friction stir is performed.

  In the present invention, it is preferable that a pilot hole is formed in advance at a planned insertion position of the rotary tool used in the first main joining step, the second main joining step, and the side main joining step. According to such a joining method, it is possible to reduce press-fit resistance when the rotary tool is pushed in. Thereby, while improving the precision of friction stir welding, a joining operation can be performed rapidly.

  According to the joining method according to the present invention, the abutting portions of the metal members can be frictionally stirred from the front side and the back side of the metal members, and the air tightness and water tightness of the metal members can be improved.

[First embodiment]
As shown in FIG. 1, the joining method according to the first embodiment joins the front surface A and the back surface B of the metal member 1 to be joined by abutting the first metal member 1a and the second metal member 1b by friction stirring. As for both side surfaces of the metal member 1 to be joined, after the repair members U1 to U3 are inserted, they are joined by friction stir along the repair members U1 to U3.
First, the metal member 1 to be bonded of the bonding method according to the present embodiment will be described in detail, and the first tab material 2 and the second tab material 3 used when bonding the metal member 1 to be bonded will be described in detail. To do.

As shown in FIGS. 2A and 2B, the metal member 1 to be joined includes a first metal member 1a and a second metal member 1b that are rectangular in cross-section, and each end face is abutted. Thus, the abutting portion J1 is formed. In the present embodiment, the first metal member 1a and the second metal member 1b are metal materials having the same composition, for example, friction such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. It consists of a stirrable metal material. Although there is no restriction | limiting in particular in the shape and dimension of the 1st metal member 1a and the 2nd metal member 1b, It is desirable to make the thickness dimension in the abutting part J1 the same at least.
In addition, as shown in FIG. 1, let the surface of the to-be-joined metal member 1 be the surface A, the back surface is the back surface B, one side surface is the 1st side surface C, and the other side surface is the 2nd side surface D. Also, the vertical and horizontal directions in the present embodiment follow the arrows in FIG.

  As shown in FIGS. 2A and 2B, the first tab member 2 and the second tab member 3 are arranged so as to sandwich the butted portion J1 of the metal member 1 to be joined, The seam (boundary line) between the first metal member 1a and the second metal member 1b, which is attached to the bonded metal member 1 and appears on the first side surface C and the second side surface D, is obscured. Although there is no restriction | limiting in particular in the material of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, it forms with the metal material of the same composition as the to-be-joined metal member 1. FIG. Moreover, there is no restriction | limiting in particular also in the shape and dimension of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, the thickness dimension is the same as the thickness dimension of the to-be-joined metal member 1 in the butt | matching part J1. I have to.

  Next, referring to FIG. 3, a rotary tool F (hereinafter referred to as “small rotary tool F”) used in the temporary joining process and a rotary tool G (hereinafter referred to as “large rotary tool G”) used in the main joining process. ) Will be described in detail.

  A small rotary tool F shown in FIG. 3A is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and projects into a shoulder portion F1 having a columnar shape and a lower end surface F11 of the shoulder portion F1. A stirring pin (probe) F2 is provided. The size and shape of the small rotary tool F may be set according to the material and thickness of the metal member 1 to be joined, but at least the large rotary tool G (FIG. 3 ( b) smaller than reference). This makes it possible to perform temporary bonding with a load smaller than that of the main bonding, so that it is possible to reduce the load applied to the friction stirrer during temporary bonding, and further, the moving speed of the small rotary tool F. Since (feeding speed) can be made higher than the moving speed of the large-sized rotary tool G, the working time and cost required for temporary joining can be reduced.

The lower end surface F11 of the shoulder portion F1 is a portion that plays a role of pressing the plastic fluidized metal and preventing scattering to the surroundings, and is formed in a concave shape in this embodiment. There is no particular limitation on the size of the outer diameter X ₁ of the shoulder portion F1, in this embodiment, is smaller than the outer diameter Y ₁ of the shoulder portion G1 of a large rotating tool G.

The stirring pin F2 hangs down from the center of the lower end surface F11 of the shoulder portion F1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin F2. There is no particular limitation on the size of the outer diameter of the stirring pin F2, in the present embodiment, than the maximum outer diameter of the maximum outer diameter of the stirring pin G2 of (upper diameter) X ₂ is large rotating tool G (upper end diameter) Y ₂ It is small, and the minimum outer diameter (bottom diameter) X ₃ is smaller than the minimum outer diameter (bottom diameter) Y ₃ of the stirring pin G2. The length L ₂ of the stirring pin F2 is preferably smaller than the large rotating the stirring pin G2 of the tool G length L _{1 (see} FIG. 3 (b)).

  A large rotary tool G shown in FIG. 3B is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and projects into a shoulder portion G1 having a cylindrical shape and a lower end surface G11 of the shoulder portion G1. A stirring pin (probe) G2 is provided.

  The lower end surface G11 of the shoulder portion G1 is formed in a concave shape like the small rotary tool F. The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

  Hereinafter, the joining method according to the present embodiment will be described in detail. The bonding method according to this embodiment includes (1) a butt process, (2) a first temporary bonding process, (3) a first main bonding process, (4) a second temporary bonding process, and (5) a second main bonding process. , (6) repair member inserting step, (7) first side main joining step, and (8) second side main joining step.

(1) Matching process The matching process will be described with reference to FIGS. 2 and 3. A butt | matching process is the process of forming the to-be-joined metal member 1, and preparing the contact member (the 1st tab material 2 and the 2nd tab material 3) in which the start position and completion | finish position of friction stirring of the to-be-joined metal member 1 are provided. is there. In this embodiment, the abutting step includes a abutting step of abutting the first metal member 1a and the second metal member 1b, and a first tab member 2 and a second tab member 3 on both sides of the abutting portion J1 of the metal member 1 to be joined. And a temporary welding step in which the first tab material 2 and the second tab material 3 are temporarily joined to the metal member 1 to be joined by welding.

  In the abutting step, as shown in FIGS. 2A and 2B, the end surface 11b of the second metal member 1b is brought into close contact with the end surface 11a of the first metal member 1a. The surface 12a of the first metal member 1a and the surface 12b of the second metal member 1b are flush with each other, and the back surface 13a of the first metal member 1a and the back surface 13b of the second metal member 1b are flush with each other. Similarly, the first side surface 14a of the first metal member 1a and the first side surface 14b of the second metal member 1b are flush with each other, and the second side surface 15a of the first metal member 1a and the second side of the second metal member 1b. The side surface 15b is flush.

  In the tab material arranging step, as shown in FIGS. 2A and 2B, the first tab material 2 is arranged on the second side surface D side of the abutting portion J1, and the contact surface 21 is made the second side surface. Abut against D. Furthermore, the 2nd tab material 3 is arrange | positioned in the 1st side C of the abutting part J1, and the contact surface 31 is made to contact | abut to the 1st side C. FIG. At this time, as shown in FIG. 2A, the surface of the first tab member 2 and the surface of the second tab member 3 are flush with the surface A of the bonded metal member 1, and the first tab member 2 And the back surface of the second tab member 3 are flush with the back surface B of the bonded metal member 1.

In the temporary welding step, as shown in FIGS. 2A and 2B, the corner portions 2a and 2b formed by the metal member 1 and the first tab member 2 are welded to join the metal member. 1 and the 1st tab material 2 are temporarily joined. Furthermore, the corners 3 a and 3 b formed by the metal member 1 and the second tab material 3 are welded to temporarily bond the metal member 1 and the second tab material 3 to each other.
In addition, welding may be performed continuously over the entire length of the corners 2a, 2b and 3a, 3b, or welding may be performed intermittently. Moreover, in a butt | matching process, when a temporary welding process is abbreviate | omitted, you may perform a butt | matching process and a tab material arrangement | positioning process on the mount frame of the friction stirring apparatus which is not shown in figure.

(2) First Temporary Bonding Step The first temporary bonding step is a step performed prior to the first main bonding step, and in the present embodiment, on the surface A side, the metal member to be bonded 1 and the first tab member 2 are joined. The first tab material temporary joining step for joining the abutting portion J2 with, the temporary joining step for temporarily joining the abutting portion J1 of the metal member 1 to be joined, and the abutting portion between the metal member 1 to be joined and the second tab material 3 It includes a second tab material temporary joining step for joining J3 and a prepared hole forming step for forming a prepared hole at the friction stirring start position in the first main joining step.

In the first temporary joining step, as shown in FIG. 4, one small rotary tool F is moved so as to form a one-stroke writing movement trajectory (bead) and continuously with respect to the abutting portions J2, J1, and J3. And friction stir. That is, the stirring pin F2 (see FIG. 3A) of the small rotary tool F inserted at the friction stirring start position _SP1 is moved to the end position _EP1 without being removed halfway. In the present embodiment, the first tab member 2 is provided with the friction stirring start position S _P1 and the second tab member 3 is provided with the end position E _P1 . However, the positions of the start position S _P1 and the end position E _P1 are the same. It is not intended to limit. Moreover, in this embodiment, all the rotation directions of the small rotation tool F and the large rotation tool G shall be performed by right rotation. In this way, by unifying the rotation directions of the small rotary tool F and the large rotary tool G, work labor can be omitted.

The procedure of friction stirring in the first temporary joining step of the present embodiment will be described in more detail with reference to FIGS.
First, the to-be-joined metal member 1 subjected to the temporary welding process is fixed to a frame of a friction stirrer (not shown). Then, positions the small rotary tool F immediately above the start position S _P1 provided in place of the first tab member 2, followed by a small rotating tool F to the right the rotated stirring started pin F2 is lowered while the position S _P1 Press on. The rotational speed of the small rotary tool F is set in accordance with the size and shape of the stirring pin F2, the material and thickness of the metal member 1 to be friction-stirred, etc. It is set within the range of 2000 (rpm).

  When the entire stirring pin F2 enters the first tab member 2 and the entire lower end surface F11 of the shoulder portion F1 comes into contact with the surface 22 of the first tab member 2, as shown in FIG. While rotating, relative movement is made toward the starting point s2 of the first tab material temporary joining step.

  When the small rotary tool F is moved, the axis of the shoulder portion F1 may be slightly inclined to the rear side in the traveling direction with respect to the vertical line. The direction can be changed easily and complicated movements are possible. When the small rotary tool F is moved, the metal around the stirring pin F2 is plastically fluidized at the same time, and the plastic fluidized metal is hardened again at a position away from the stirring pin F2.

  When the small rotary tool F is relatively moved and friction stirring is continuously performed up to the starting point s2 of the first tab material temporary joining step, the first tab material temporary joining step is performed without removing the small rotating tool F at the starting point s2. Transition.

  In the first tab material temporary joining step, friction agitation is performed on the abutting portion J2 between the first tab material 2 and the metal member 1 to be joined. Specifically, a friction stir route is set on the joint (boundary line) between the metal member 1 to be joined and the first tab member 2, and the small rotating tool F is relatively moved along the route. Friction stirring is performed on J2. In the present embodiment, friction stir is continuously performed from the start point s2 to the end point e2 of the first tab member temporary joining step without causing the small rotary tool F to be detached on the way.

  In addition, when the small rotary tool F is rotated to the right, there is a possibility that a fine cavity defect may occur on the left side in the traveling direction of the small rotating tool F. It is desirable to set the positions of the start point s2 and the end point e2 of the first tab material temporary joining step so that the member 1 is positioned. If it does in this way, since it becomes difficult to generate | occur | produce a cavity defect in the to-be-joined metal member 1 side, it becomes possible to obtain a high quality joined body.

  Incidentally, when the small rotary tool F is rotated counterclockwise, there is a possibility that a fine cavity defect may occur on the right side in the traveling direction of the small rotating tool F. It is desirable to set the positions of the start point and end point of the first tab material temporary joining step so that the member 1 is positioned. Specifically, although not shown, a starting point is provided at the end point e2 when the small rotating tool F is rotated to the right, and an end point is provided at the starting point s2 when the small rotating tool F is rotated to the right. Just do it.

  In addition, when the stirring pin F2 of the small rotary tool F enters the abutting portion J2, a force for separating the bonded metal member 1 and the first tab material 2 acts, but the bonded metal member 1 and the first tab material 2 are applied. Since the corners 2a and 2b (see FIG. 2) formed by the above are temporarily joined by welding, no openings are generated between the metal member 1 to be joined and the first tab member 2.

  When the small rotary tool F reaches the end point e2 of the second tab material temporary joining process, the friction stirring is continuously performed at the end point e2 until the starting point s1 of the temporary joining process is finished, and the process proceeds to the temporary joining process as it is. To do. That is, friction stirring is continued without detaching the small rotary tool F from the end point e2 of the first tab material temporary joining process to the start point s1 of the temporary joining process, and further, the temporary rotary tool F is temporarily removed without detaching the small rotary tool F at the start point s1. Transition to the joining process. If it does in this way, the separation work of small rotation tool F in the end point e2 of the first tab material temporary joining process becomes unnecessary, and also the insertion work of small rotation tool F in the starting point s1 of the temporary joining process becomes unnecessary. Therefore, it becomes possible to improve the efficiency and speed of the preliminary joining work.

  In the temporary joining step, friction agitation is performed on the abutting portion J1 (see FIG. 4) of the metal member 1 to be joined. Specifically, a friction stir route is set on the joint (boundary line) of the metal member 1 to be joined, and the small rotary tool F is relatively moved along the route, so that the entire length of the abutting portion J1 is reached. Friction stirring is performed continuously. In the present embodiment, friction stir is continuously performed from the start point s1 to the end point e1 of the temporary joining step without causing the small rotary tool F to be detached halfway.

  When the small rotary tool F reaches the end point e1 of the temporary joining process, the friction stir is not completed at the end point e1 and the friction stirring is continuously performed up to the start point s3 of the second tab material temporary joining process. Transition to the joining process. That is, the friction stirring is continued without detaching the small rotary tool F from the end point e1 of the temporary joining process to the start point s3 of the second tab material temporary joining process, and further, the first rotation without removing the small rotary tool F at the start point s3. The process proceeds to the two-tab material temporary joining step.

  In this embodiment, the friction stir route from the end point e1 of the temporary joining step to the start point s3 of the second tab member temporary joining step is set to the second tab member 3, and the small rotary tool F is moved from the end point e1 of the temporary joining step. A movement locus when moving to the start point s3 of the second tab material temporary joining step is formed in the second tab material 3. If it does in this way, since it becomes difficult to generate | occur | produce a cavity defect in the to-be-joined metal member 1 in the process from the end point e1 of a temporary joining process to the start point s3 of a 2nd tab material temporary joining process, a high quality bonded body is obtained. It becomes possible.

  In the second tab material temporary joining step, friction agitation is performed on the abutting portion J3 between the metal member 1 to be joined and the second tab material 3. Specifically, a friction stir route is set on the joint (boundary line) between the metal member 1 to be joined and the second tab member 3, and the small rotary tool F is relatively moved along the route. Friction stirring is performed on J3. In the present embodiment, friction stir is continuously performed from the start point s3 to the end point e3 of the second tab material temporary joining step without causing the small rotary tool F to be detached on the way.

  Since the small rotary tool F is rotated to the right, the positions of the start point s3 and the end point e3 of the second tab member temporary joining step are set so that the metal member 1 to be joined is located on the right side of the traveling direction of the small rotary tool F. Set.

  Further, when the stirring pin F2 of the small rotary tool F enters the abutting portion J3, a force for separating the metal member 1 to be bonded and the second tab material 3 acts, but the metal member 1 to be bonded and the second tab material 3 are applied. Since the corners 3 a and 3 b (see FIG. 2) are temporarily joined by welding, no opening is generated between the metal member 1 to be joined and the second tab member 3.

When the small rotary tool F reaches the end point e3 of the second tab material temporary joining step, the friction stir is continuously performed to the end position E _P1 provided in the second tab material 3 without ending the friction stirring at the end point e3. . In the present embodiment, the end position E _P1 is provided on the extension line of the seam (boundary line) that appears on the surface A side of the bonded metal member 1. Incidentally, the end position E _P1 is also a friction stirring start position S _M1 in the first main joining process described later.

When the small rotary tool F reaches the end position E _P1 , the small rotary tool F is raised while being rotated to disengage the stirring pin F2 from the end position E _P1 .

  The first tab material temporary joining process, the temporary joining process, and the second tab material temporary joining process have been described above, but the trajectory in each joining process is merely an example, and other forms may be used. Further, the first tab material temporary joining step and the second tab material temporary joining step may be omitted and only the temporary joining step may be performed.

In the pilot hole forming process, as shown in FIG. 3B, the pilot hole P1 is formed at the friction stirring start position in the first main joining process. In the pilot hole forming process according to the first temporary joining process, the pilot hole P1 is formed in S _M1 set on the surface 32 of the second tab member 3.

  The pilot hole P1 is provided for the purpose of reducing the insertion resistance (press-fit resistance) of the agitation pin G2 of the large rotary tool G. In this embodiment, the agitation pin F2 of the small rotary tool F ((a ) See)) is formed by expanding the diameter of the hole H1 formed by a drill (not shown). If the punch hole H1 is used, the process of forming the pilot hole P1 can be simplified, and the working time can be shortened. Although there is no restriction | limiting in particular in the form of the pilot hole P1, In this embodiment, it is cylindrical. In addition, in this embodiment, although the pilot hole P1 is formed in the 2nd tab material 3, there is no restriction | limiting in particular in the position of the pilot hole P1, You may form in the 1st tab material 2, and the butt | matching part J2 , J3 may be preferably formed on the extended line of the joint (boundary line) of the metal member 1 to be bonded that appears on the surface A side of the metal member 1 to be bonded as in the present embodiment. .

(3) 1st main joining process A 1st main joining process is a process of joining the butt | matching part J1 in the surface A side of the to-be-joined metal member 1 in earnest. In the first main joining process according to the present embodiment, a large rotating tool G is used, and friction stir is performed from the surface A side of the joined metal member 1 to the abutting portion J1 in a temporarily joined state.

In the first one bonding step, as shown in (a) ~ (c) of FIG. 5, the stirring pin G2 of the large rotating tool G inserted (press-fitted) into the prepared hole P1 formed in the start position S _M1, inserted The stirring pin G2 is moved to the end position E _M1 without being removed halfway. That is, in the first main joining process, the friction stirring is started from the pilot hole P1, and the friction stirring is continuously performed up to the end position _EM1 .

In this embodiment, the second tab member 3 is provided with the friction stirring start position S _M1 and the first tab member 2 is provided with the end position E _M1 . However, the positions of the start position S _M1 and the end position E _M1 are as follows. It is not intended to limit.

The first main joining process will be described in more detail with reference to FIGS.
When the entire stirring pin G2 enters the second tab member 3 and the entire lower end surface G11 of the shoulder portion G1 comes into contact with the surface 32 of the second tab member 3, as shown in FIG. While stirring, the large rotary tool G is relatively moved toward one end of the abutting part J1 of the metal member 1 to be joined, and further, the abutting part J3 is traversed to enter the abutting part J1. When the large rotating tool G is moved, the metal around the stirring pin G2 is plastically fluidized at the same time, and at the position away from the stirring pin G2, the plastic fluidized metal is hardened again and becomes a plasticized region ( Hereinafter, “surface-side plasticization region W1”) is formed.

  The moving speed (feeding speed) of the large-sized rotating tool G is set according to the size and shape of the stirring pin G2, the material and thickness of the metal member 1 to be joined by friction stirring, etc. In this case, it is set within a range of 30 to 300 (mm / min).

  When there is a possibility that the amount of heat input to the bonded metal member 1 becomes excessive, it is desirable to cool the large rotating tool G by supplying water from the surface A side. In addition, when cooling water enters between the first metal member 1a and the second metal member 1b, there is a possibility that an oxide film may be generated on the joining surfaces (end surfaces 11a and 11b, see FIG. 2B). In the embodiment, since the joint between the bonded metal members 1 is closed by executing the temporary bonding process, it is difficult for the cooling water to enter between the bonded metal members 1 and there is no possibility of deteriorating the quality of the bonded portion.

At the abutting portion J1 of the metal member 1 to be bonded, a route for friction stirring is set on the joint of the metal member 1 to be bonded (on the movement locus in the temporary bonding process), and the large rotary tool G is relatively moved along the route. Thus, friction stirring is continuously performed from one end to the other end of the abutting portion J1. When the large rotary tool G is relatively moved to the other end of the abutting portion J1, the abutting portion J2 is traversed while performing frictional stirring, and is relatively moved toward the end position E _M1 as it is.

In the present embodiment, the friction stirring start position S _M1 is set on the extension line of the joint (boundary line) of the metal member 1 to be bonded that appears on the surface A side of the metal member 1 to be bonded. The friction stir route in the joining process can be made straight. If the friction stir route is made straight, the moving distance of the large rotating tool G can be minimized, so that the first main joining process can be performed efficiently, and the amount of wear of the large rotating tool G is further improved. Can be reduced.

When the large rotary tool G reaches the end position E _M1 , as shown in FIG. 5C, the large rotary tool G is raised while rotating to move the stirring pin G <b _> 2 to the end position E _M1 (FIG. 5B). (See below).

It is desirable that the rotational speed of the large rotary tool G when the stirring pin G2 of the large rotary tool G is separated from the end position E _M1 (the rotational speed at the time of separation) is higher than the rotational speed at the time of movement. In this case, the separation resistance of the stirring pin G2 becomes smaller than when the rotational speed at the time of separation is the same as the rotational speed at the time of movement, so that the work of removing the stirring pin G2 at the end position E _M1 can be performed quickly. Can be done.

  In the present embodiment, the first temporary bonding step is performed before the first main bonding step, but the first temporary bonding step is omitted and the first main bonding step is performed immediately after the abutting step. Also good.

(4) Second Temporary Bonding Step In the second temporary bonding step, as shown in FIGS. 6A and 6B, the abutting portion J3 using the small rotating tool F from the back surface B of the metal member 1 to be bonded. Temporary joining is performed to J1 and J2. In the second temporary joining step, when the first main joining step is finished, the front and back of the metal member 1 to be joined are reversed and fixed to the friction stirrer. In the second temporary joining step, friction stir is continuously performed from the start position S _P2 set for the second tab material 3 to the end position E _P2 set for the first tab material 2. Since the second temporary bonding step is substantially the same as the first temporary bonding step except that the second temporary bonding step is temporary bonding to the back surface B, detailed description thereof is omitted. Note that the second temporary joining step may be omitted.

(5) Second Main Joining Process In the second main joining process, as shown in FIG. 7, friction agitation is performed on the abutting part J1 in earnest from the back surface B of the metal member 1 to be joined using a large rotary tool G. Do. In the second main joining step, friction stir is continuously performed from S _M2 set for the first tab material 2 to E _M2 set for the second tab material 3. By the second main joining step, the back surface side plasticized region W2 is formed along the abutting portion J1 on the back surface B of the metal member 1 to be joined. The second main joining step is substantially the same as the first main joining step except that the second main joining step is frictional stirring with respect to the back surface B, and a detailed description thereof will be omitted.

FIG. 8 is a perspective view showing a state in which the surface A is directed upward after the second main joining step. As shown in FIG. 8, the front side plasticization region W1 and the back side plasticization region W2 formed respectively on the front surface A and the rear surface B of the metal member 1 to be joined are continuous from the first side surface C to the second side surface D. As a result, tunnel-like cavity defects R ₁ and R ₂ may be formed. As described above, when the rotating tool is rotated to the right, the defect may be formed on the left side in the traveling direction. Therefore, in the present embodiment, the tunnel-like cavity defect R ₁ , R ₂ is formed. Further, on the first side surface C and the second side surface D of the metal member 1 to be joined, unplasticized regions j and j are formed between the front surface side plasticized region W1 and the rear surface side plasticized region W2, respectively. When the second main joining process is completed, the pair of tab members are cut from the metal member 1 to be joined.

(6) Repair Member Insertion Step The repair member insertion step is a step of inserting each repair member into the side surface of the metal member 1 to be joined, as shown in FIG. In the present embodiment, the repair member insertion step includes a slot forming step for forming the slots K2 and K3 in the tunnel-like cavity defects R ₁ and R ₂ and a recess K1 in the unplasticized region j. A recessed portion forming step, and a repair member inserting step of inserting each repair member into the slots K2, K3 and the recessed portion K1.

In the slot forming step, as shown in FIG. 9, the periphery of the tunnel-like cavity defects R ₁ and R ₂ appearing on the first side surface C and the second side surface D (not shown) is cut by a known end mill or the like and predetermined. Slots K2 and K3 are formed at a depth of. The slots K2 and K3 have substantially the same size in this embodiment. The slots K2 and K3 are formed in a cylindrical shape, but the shape is not limited.
Even if the tunnel-like cavity defects R ₁ and R ₂ do not appear (are not exposed) on the first side surface C and the second side surface D, the cavity defects may be inherent. Slots K2 and K3 may be formed at appropriate positions on the second metal member 1b side of the front side plasticizing region W1 and the back side plasticizing region W2 according to the one side C and the second side D.

As shown in FIGS. 8 and 9, the recess forming step is a step of cutting the periphery of the unplasticized region j appearing on the first side surface C and the second side surface D with a known end mill or the like to form the recess K1. . In the present embodiment, the recess K1 has an oval shape in plan view and is formed with a predetermined depth. Although the shape of the concave portion K1 is not limited, the concave portion K1 is formed continuously over the entire length of the unplasticized region j, and the concave portion K1, the front surface side plasticized region W1, and the back surface side plasticized region W2 overlap. It is preferable to form as follows. In the present embodiment, the depth of the recess K1 and the depth of the slots K2 and K3 are formed to be equal.
Incidentally, as shown in FIG. 9 (b), the distance from the butting portion J1 to the center of the tunnel-like void defects R _1, the distance from the butting portion J1 and a long side at K1a which is one side of the recess K1 is substantially equal It is preferable to form such that Thereby, the route of friction stirring can be formed in a straight line in the side surface main joining step described later.

In the repair member inserting step, as shown in FIG. 9, the first cavity repair member U2 and the second cavity repair member U3 are inserted into the slots K2 and K3, and the recess repair member U1 is inserted into the recess K1. The first cavity repair member U2 and the second cavity repair member U3 have the same composition as the bonded metal member 1, and are formed in a shape substantially equivalent to the shape of the slots K2 and K3. Thereby, the 1st cavity part repair member U2 and the 2nd cavity part repair member U3 are arrange | positioned in the slot K2, K3 substantially without gap.
Moreover, the recessed part repair member U1 consists of a composition equivalent to the to-be-joined metal member 1, and is formed in substantially the same shape as the recessed part K1. Thereby, the recessed part repair member U1 is arrange | positioned in the recessed part K1 substantially without gap.

  In addition, although the recessed part repair member U1, the 1st cavity part repair member U2, and the 2nd cavity part repair member U3 are formed so that the surface and the 1st side surface C may become the same, it is not limited to this In addition, the thickness of each member may be increased so that each member protrudes from the first side surface C. In the description, the first side surface C is taken as an example, but the slot side forming step, the concave portion forming step, and the repair member inserting step are similarly performed on the second side surface D.

(7) First side main joining step In the first side main joining step, friction agitation is performed on the first side C using a small rotary tool F as shown in FIG. The first side main joining process includes a tab material arranging process for arranging a pair of tab materials on the metal member 1 to be joined, and a second cavity repair member friction stirring process for performing friction stirring on the second cavity repair member U3. And a recess repair member friction stirring step for performing friction stirring on the abutting portion J2 of the recess repair member U1 and the metal member 1 to be joined, and a first cavity portion for performing friction stirring on the first cavity repair member U2 A repair member friction stirring step.

  In the tab material arranging step, the first tab material 4 is arranged on the back surface B of the bonded metal member 1 and the second tab material 5 is arranged on the front surface A. Both end surfaces of the first tab member 4 and the second tab member 5 are formed flush with the first side surface C and the second side surface D (not shown) of the bonded metal member 1. Moreover, the to-be-joined metal member 1, the 1st tab material 4, and the 2nd tab material 5 are temporarily joined by welding.

In the second cavity repair member friction stirring step, friction stirring is performed on the second cavity repair member U3 as shown in FIG. In the present embodiment, the small rotary tool F is inserted into the start position _SM3 set on the first tab member 4, the entire stirring pin F2 enters the first tab member 4, and the lower end surface of the shoulder portion F1 When the entire surface of F11 comes into contact with the surface of the first tab member 4, it is moved relative to the metal member 1 side to be joined, and further moved across the abutting portion J4 and on the second cavity repair member U3.
Here, as shown in FIG. 10 (b), the first side surface plasticizing region W3 formed in the first side main bonding step is such that the second cavity portion repair member U3 is the first side surface plasticizing region W3. It is preferable that it is formed so as to be entirely contained in the inside. This makes it possible to butting portion between the bottom and side surfaces of the second cavity portion the repair section U3 and slot K3 (abutting surface) are all friction stir, to reliably seal the tunnel-like void defects R _2.

  When the small rotary tool F passes through the second cavity repair member U3, the process proceeds to the recess repair member friction stirring step. In the recess repairing member friction stirring step, friction stirring is continuously performed along the outer periphery of the recess repairing member U1. That is, friction stirring is performed by relatively moving the small rotary tool F along the abutting portion J2a between the second metal member 1b and the concave portion repairing member U1 and the abutting portion J2b between the first metal member 1a and the concave portion repairing member U1. Since the depth of the first side surface plasticizing region W3 is larger than the depth of the recess K1, the entire length in the depth direction of the abutting portion J2 can be frictionally stirred.

As shown in FIG. 10 (c), when the small rotating tool F is made to make one round along the outer periphery of the concave portion repairing member U1 and the friction stir with respect to the abutting portion J2a and the abutting portion J2b is finished, the small rotating tool F is detached. Instead, the friction agitation is again performed along the abutting portion J2a, and the first cavity repair member U2 is moved to move to the first cavity repair member friction agitation process. Although not specifically illustrated, it is preferable that the first side surface plasticizing region W3 formed in the first side main bonding step is formed so that the first cavity repair member U2 includes all. That is, it is preferable that the abutting portion between the first cavity repair member U2 and the bottom and side surfaces of the slot K2 is frictionally stirred. Thus, it is possible to reliably seal the ends of the tunnel-like void defects R _2.
Then, a small rotary tool F is After passing through the first hollow portion the repair section above U2, disengaging the small rotary tool F at the end position E _M3 set in the second tab member 5 as it across the butting portion J5.

  In the present embodiment, the frictional stirring is performed only on the outer periphery of the concave portion repairing member U1, but the present invention is not limited to this, and the entire surface of the concave portion repairing member U1 may be subjected to frictional stirring. At this time, it is preferable that all the abutting portions between the bottom surface of the concave portion K1 and the concave portion repairing member U1 are friction-stirred. Thereby, watertightness and airtightness can be improved more.

In the first cavity repair member friction stirring step and the second cavity repair member friction stirring step, the diameters of the first cavity repair member U2 and the second cavity repair member U3 are set to the first side plasticity region W3. because of the formation width (small rotational outer diameter X ₁ of the shoulder portion F1 of the tool F substantially equal) smaller than the a first cavity repair section U2 and the second cavity portion the repair section U3 upper passed a small rotary tool F Then, friction stirring was performed. However, when the diameters of the first cavity repair member U2 and the second cavity repair member U3 are larger than the outer diameter of the shoulder of the rotary tool, the first cavity repair member U2 and the second cavity repair member U3 Friction stirring may be performed by moving the rotary tool along the outer periphery. In such a case, friction stirring may be performed over the entire surface of the first cavity repair member U2 and the second cavity repair member U3 by reciprocating the rotary tool.

(8) Second side main joining step In the second side main joining step, although not specifically illustrated, friction stirring is performed on the second side D using the small rotary tool F. Hereinafter, the plasticized region formed in the second side main joining process is referred to as a second side-side plasticized region (not shown). Since the second side main joining step is substantially the same as the first side main joining step except that friction stirring is performed on the second side D, detailed description thereof is omitted. In addition, in this embodiment, although the 1st side surface main joining process and the 2nd side surface main joining process were performed from the both sides | surfaces of the to-be-joined metal member 1 as a side surface main joining process, you may carry out only to either one. . Moreover, in the side surface main joining process which concerns on this embodiment, although the small rotation tool F was used, you may use the rotation tool of another magnitude | size.

According to the joining method described above, since the recessed portion repairing member U1 is inserted into the recessed portion K1 formed on the side surface of the metal member 1 to be joined, the unplasticized region j can be closed. Further, since the first cavity repair member U2 and the second cavity repair member U3 are inserted into the slots K2 and K3, respectively, the ends of the cavity defects R ₁ and R ₂ can be closed. And in order to frictionally stir the butt | matching part of the recessed part repair member U1, the 1st cavity part repair member U2, the 2nd cavity part repair member U3, and the to-be-joined metal member 1 at a side surface main joining process, the airtight of the to-be-joined metal member 1 is carried out. And water tightness can be improved. Moreover, since the recessed part K1 has overlapped with the surface side plasticization area | region W1 and the back surface side plasticization area | region W2, the 1st 1st side surface side plasticization area | region W3, the surface side plasticization area | region W1, and the back surface side plasticization area | region W2 And can be duplicated. Thereby, since all the unplasticized area | region j (refer FIG. 8) is sealed, airtightness and watertightness can be improved more.
Further, in the first side main joining step and the second side main joining step, workability is improved because friction stir is performed in the manner of one stroke writing without removing the small rotary tool F once inserted. it can.

Here, when friction-stirring the tunnel-like cavity defects R ₁ and R ₂ , if each repair member is not used, the metal for filling the tunnel-like cavity defects R ₁ and R ₂ is insufficient. There was a consideration that a groove inevitably formed on the surface of the side-side plasticized region W3 becomes large. However, the metal shortage can be compensated by inserting the first cavity repair member U2 and the second cavity repair member U3 as in the present embodiment.

  The embodiment of the present invention has been described above, but the present invention can be modified as appropriate without departing from the spirit of the present invention. In the following description, the same description as in the first embodiment is omitted.

[Second Embodiment]
In the first embodiment, the recess repair member U1, the first cavity repair member U2, and the second cavity repair member U3 are inserted into the recess K1, the slot K2, and the slot K3. For example, a weld metal filling step of performing welding on K1 and slots K2 and K3 may be performed.
Although the welding metal filling process is not specifically illustrated, in the second embodiment, a groove forming process for forming a hole for a tunnel-like cavity defect and a recess for an unplasticized region are formed. A recess forming step and a weld metal filling step of filling the groove and the recess with the weld metal. Since the slot forming step and the recess forming step are substantially the same as those in the first embodiment, description thereof is omitted.

For welding, for example, overlay welding such as TIG welding or MIG welding is performed, and the weld metal may be filled in the recesses K1 and the slots K2 and K3 (see FIG. 9). Moreover, the airtightness and watertightness of the to-be-joined metal member 1 can be improved by carrying out friction stirring of all the interfaces of the recessed part K1, the slot K2, K3, and the said weld metal at a side surface main joining process. Further, since the friction stir is performed while the weld metal is being pushed in, the airtightness and watertightness can be further improved.
In the case of the second embodiment, overlay welding is performed to cut the weld metal protruding from the first side surface C (second side surface D) to form the first side surface C (second side surface D) smoothly. It is preferable to do this. Moreover, you may join by combining the repair member insertion process which concerns on 1st embodiment, and the weld metal filling process which concerns on 2nd embodiment.

Further, for example, before the recess forming step, the first side C and the second side D are temporarily joined to the abutting portion between the abutting portion J1 and the tab material and the joined metal member 1 using the small rotary tool F. May be performed. Moreover, when the thickness of the to-be-joined metal member 1 is thin and the front surface side plasticization area | region W1 and the back surface side plasticization area | region W2 overlap, the recessed part K1 and the recessed part repair member U1 do not need to be used.
Moreover, when the oxide film is formed in the surface side plasticization area | region W1 and the back surface plasticization area | region W2, the said oxide film is sealed by welding etc., and the water-tightness and airtightness of the to-be-joined metal member 1 are improved. It is preferable.
Further, in the present embodiment, the case where the rotating tool is rotated to the right has been described as an example. However, when the rotating tool is rotated to the left, a tunnel-like cavity defect is formed on the right side in the traveling direction of the rotating tool. there is a possibility. That is, a region where friction stirring is performed may be appropriately set depending on the rotation direction and the traveling direction of the rotary tool. Further, in this embodiment, the periphery of the tunnel-like cavity defect is cut to form the slot, but the present invention is not limited to this, and the cavity repair member may be inserted into the tunnel-like cavity defect as it is. .

It is the perspective view which showed the to-be-joined metal member which concerns on 1st embodiment. It is the figure which showed the butt | matching process which concerns on 1st embodiment, (a) is a perspective view, (b) is a top view. It is the figure which showed the rotation tool which concerns on 1st embodiment, Comprising: (a) is a side view of a small rotation tool, (b) is a side view of a large rotation tool. It is the top view which showed the 1st temporary joining process which concerns on 1st embodiment. It is sectional drawing which showed the 1st main joining process which concerns on 1st embodiment by the II arrow direction of FIG. 4, Comprising: (a) is a starting position part, (b) is an intermediate position part, (c ) Is a diagram showing friction agitation at the end position portion. It is the figure which showed the 2nd temporary joining process which concerns on 1st embodiment, Comprising: (a) is sectional drawing, (b) is a top view. It is the II-II sectional view taken on the line II-II of Drawing 6 (b) showing the 2nd final joining process concerning a first embodiment, (a) is a starting position portion and (b) is friction stirring of an intermediate position portion. FIG. It is the perspective view which showed the state which orient | assigned the surface A upwards after performing a 2nd main joining process. (A) is the perspective view which showed the slot formation process, recessed part formation process, and repair member insertion process which concern on 1st embodiment, Comprising: (b) is an expansion of the surface side plasticization area periphery of (a) It is a front view. It is the figure which showed the 1st side surface main joining process, Comprising: (a) is the top view which showed the intermediate part, (b) is the III-III sectional view taken on the line (a), (c) is an end position. It is the top view which showed the part. It is the perspective view which showed the conventional joining method. It is the perspective view which showed the conventional joining method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal member to be joined 1a 1st metal member 1b 2nd metal member 2 1st tab material 3 2nd tab material A surface B back surface C 1st side surface D 2nd side surface F small rotation tool G large rotation tool j unplasticization area | region K1 recess K2 slot K3 slot U1 recess repair member U2 first cavity repair member U3 second cavity repair member P1 pilot hole R ₁ , R ₂ tunnel-like cavity defect W1 surface side plasticization region W2 back side plasticization region

Claims (12)

A joining method in which friction stir is performed on a metal member to be joined formed by abutting a pair of metal members,
A first main joining step in which friction agitation is performed from the surface of the metal member to be joined to the abutting portion of the pair of metal members;
A second main joining step in which friction agitation is performed from the back surface of the metal member to be joined to the abutting portion;
A cavity formed in at least one of the front side plasticization region formed in the first main joining step and the back side plasticization region formed in the second main joining step on the side surface of the metal member to be joined A cavity repair member insertion step of inserting the cavity repair member into the defect;
A side main joining step in which friction agitation is performed from the side surface of the metal member to be joined to the abutting portion, and
The side surface main joining step includes
Friction stirring the unplasticized region between the front surface side plasticized region and the back surface side plasticized region, and at least one of the front surface side plasticized region and the back surface side plasticized region, and the cavity repair A joining method characterized by friction-stirring an abutting portion with a member. The cavity repair member insertion step includes
Including a slot forming step of forming a slot by cutting around a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region on the side surface of the metal member to be bonded; The joining method according to claim 1, wherein the cavity repair member is inserted into the slot. A joining method in which friction stir is performed on a metal member to be joined formed by abutting a pair of metal members,
A first main joining step in which friction agitation is performed from the surface of the metal member to be joined to the abutting portion of the pair of metal members;
A second main joining step in which friction agitation is performed from the back surface of the metal member to be joined to the abutting portion;
A cavity formed in at least one of the front side plasticization region formed in the first main joining step and the back side plasticization region formed in the second main joining step on the side surface of the metal member to be joined A weld metal filling process for filling the defect with weld metal;
A side main joining step in which friction agitation is performed from the side surface of the metal member to be joined to the abutting portion, and
The side surface main joining step includes
While friction-stirring an unplasticized region between the front side plasticized region and the back side plasticized region, at least one of the front side plasticized region and the back side plasticized region, and the weld metal A joining method characterized by friction-stirring the interface. The weld metal filling step includes
Including a slot forming step of forming a slot by cutting around a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region on the side surface of the metal member to be bonded; The joining method according to claim 3, wherein the weld metal is filled in the slot. A joining method in which friction stir is performed on a metal member to be joined formed by abutting a pair of metal members,
A first main joining step in which friction agitation is performed from the surface of the metal member to be joined to the abutting portion of the pair of metal members;
A second main joining step in which friction agitation is performed from the back surface of the metal member to be joined to the abutting portion;
On the side surface of the metal member to be joined, a recess is formed in the unplasticized region between the front side plasticized region formed in the first main joining step and the back side plasticized region formed in the second main joining step. A recess forming step to be formed;
A recess repair member inserting step of inserting a recess repair member into the recess;
And a side main joining step in which friction agitation is performed on the abutting portion between the recessed portion repairing member and the one metal member and the abutting portion between the recessed portion repairing member and the other metal member. Method. A slot forming step of forming a slot by cutting around a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region;
A cavity repair member inserting step of inserting a cavity repair member into the slot, and
The joining method according to claim 5, wherein friction agitation is performed on an abutting portion between at least one of the front surface side plasticizing region and the back surface side plasticizing region and the cavity repair member. A slot forming step of forming a slot by cutting around a cavity defect formed in at least one of the front surface side plasticized region and the back side plasticized region;
A cavity repair member inserting step of inserting a cavity repair member into the slot, and
6. The joining according to claim 5, wherein friction stir is performed over the entire abutting portion between at least one of the front surface side plasticized region and the back surface side plasticized region and the cavity repair member. Method.   The joining method according to any one of claims 1 to 7, wherein in the side main joining step, the rotary tool is moved in a manner of one-stroke writing. The rotary tool used in the side main joining process is:
The joining method according to any one of claims 1 to 8, wherein the joining method is smaller than a rotary tool used in the first main joining step and the second main joining step.   2. The method according to claim 1, further comprising a temporary bonding step of temporarily bonding the abutting portion before performing at least one of the first main bonding step, the second main bonding step, and the side main bonding step. Item 10. The bonding method according to any one of Items 9.   The tab material temporary joining process which arrange | positions a pair of tab material on the both sides of the said abutting part, and temporarily joins the abutting part of the said tab material and the said to-be-joined metal member is included. The joining method according to any one of the above. The pilot hole is formed in advance at a planned insertion position of a rotary tool used in the first main joining step, the second main joining step, and the side main joining step. The joining method according to item.

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