JPH0661620B2 - Pipe welding method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe welding method and apparatus, and more particularly to a pipe welding method and apparatus suitable for automatically welding a welded pipe to a fixed pipe. .

[Conventional technology]

In recent years, along with automation of welding work, an automatic welding apparatus has been put into practical use for the purpose of automatic welding of pipes in thermal power plants, nuclear plants, chemical plants, buildings and the like. The automatic welding of these pipes is a method of automatically welding the butt welding of the pipes or the fillet welding of the pipes and the pipe joint by the TIG welding method or the plasma welding method.

Conventionally, in the automatic welding of this type of pipe, it is necessary to temporarily weld the pipe before attaching the automatic welding device to the pipe, and to previously align one fixed pipe of the pipe with the welded pipe of the other. Therefore, even though it is called automatic welding, provisional work by manual welding was necessary in the setup work before automatic welding. As a positioning device for the fixed pipe and the pipe to be welded for the purpose of temporary attachment work by hand welding,
No. 5, Gazette of Utility Model Publication No. 60-46986, etc., but such an alignment device needs to be removed from the pipe in order to mount the automatic welding device after temporary welding work by hand welding. It was Further, as a device for automatically welding by rotating a welding torch on the circumference of a pipe, Japanese Utility Model Publication No. 59-42218,
Although there is JP-A-53-115638, these automatic welding devices perform main welding or build-up welding after temporary welding of pipes. It was necessary to manually weld them.

[Problems to be solved by the invention]

As described above, the prior art is to introduce an automatic welding device after finishing the tack welding for positioning the pipes, and the tack welding by manual welding can be performed only by a welding qualified person. There was a problem. Further, since the conventional pipe alignment device is not configured to be able to simultaneously install the automatic welding device, there is a problem that temporary welding of the pipe by the automatic welding device cannot be performed with the alignment device attached to the pipe. Atsuta

The present invention has been made in view of the above points, and its purpose is to eliminate temporary welding by hand welding, and temporary welding can be automatically performed by general workers instead of welding qualified personnel, It is an object of the present invention to provide a pipe welding method and apparatus capable of automatically performing subsequent main welding and improving efficiency and welding reliability.

[Means for solving problems]

The present invention performs temporary tack welding by automatically welding an arbitrary circumference on the circumference of a welding groove of a fixed pipe to be fixed and a pipe to be welded to the fixed pipe by an automatic welding device, Main welding performed after tack welding, the automatic welding apparatus that performed tack welding, the same device automatically welds the entire circumference of the circumference of the welding groove pipe welding method, and stationary A first clamp for holding a fixed pipe, a second clamp for holding a welded pipe to be welded to the fixed pipe, the first clamp, and a second clamp are connected to each other, and the fixed pipe and the welded pipe are respectively connected. A pipe alignment device including a connecting body for abutting a weld groove provided at an end, a welding torch for welding the weld groove of the fixed pipe and the welded pipe abutted by the pipe alignment device, and the welding Rotate the torch on the circumference of the welding groove where the fixed pipe and the pipe to be welded meet. And a driving device for supporting the welding torch and an automatic welding device including a frame for holding the fixed tube, wherein each of the first clamp and the second clamp includes a cross beam, A fixed pillar that hangs down from the central portion of the cross beam, and two levers that are pin-connected to and suspended from the cross beam on both sides of the fixed pillar,
The second clamp includes a tightening screw that hinges with the levers and is rotatably connected to the fixed column to open and close the lever. Further, the second clamp axially penetrates the fixed column and hinges with the fastening direction. To the welded pipe side end of the first feed screw, and the connecting body is connected to both ends of the horizontal beam of the first clamp. Two extended connecting rods, an end beam connecting the extended ends of the two connecting rods, a hinge with the end beam, and a rotatably connected second clamp. Two
A second feed screw for moving the clamp in the axial direction of the pipe, and the automatic welding device is mounted on the fixed pipe in a space formed by the first clamp, the second clamp, and the connecting body, The first clamp is configured in a semi-dividable cylindrical shape extending from the outer peripheral surface of the fixed pipe to the outer peripheral surface of the pipe to be welded, and at several places on the periphery of the butted welding groove of the cylindrical portion. Is an opening hole for temporary welding,
A tapered portion having an inner diameter of an end extending to the outer peripheral surface of the pipe to be welded of the cylindrical portion is provided, while the second clamp is formed in a cylindrical shape that can be halved on the outer peripheral surface of the pipe to be welded. A taper portion having the same slope as the taper portion is provided on the outer diameter of the fixed pipe side end of the cylindrical portion, and the connecting body is fixed by fitting the taper portion of the inner diameter and the taper portion of the outer diameter. Or the first clamp and the second clamp are formed in a cylindrical shape that can be half-divided on the peripheral surfaces of the fixed pipe and the pipe to be welded, respectively, and on the outer circumference of the cylindrical portion thereof. A bearing capable of being divided into halves is rotatably provided, and the connecting body is formed into a cylindrical shape capable of being divided into halves by fitting into the respective bearings, and the welding torch is provided on a peripheral surface of the connecting body. Mounted in the mounting hole, It is composed of a gear provided, a pinion provided in the first clamp and meshing with the gear, and an electric motor connected to the pinion, and the frame is also used as the first clamp, whereby the pipe It is characterized in that it is a pipe welding device in which a positioning device and the automatic welding device are integrated.

[Action]

By the pipe welding method of the present invention, the temporary welding is automatically performed by the automatic welding device in the state where the fixed pipe and the pipe to be welded are aligned, and any peripheral length on the circumference of the welding groove can be set. Since the main welding that is performed after the tack welding with the same automatic welding equipment as the welding can be performed automatically by welding the entire circumference of the welding groove circumference, tack welding by manual welding can be performed. The temporary welding can be automatically performed by the general worker instead of the qualified welding person, and the subsequent main welding can be automatically performed to improve the efficiency and the welding reliability.

Further, in the pipe welding apparatus of the present invention, the fixed pipe is held by the first clamp and the welded pipe is held by the second clamp,
It is a connecting body that connects the first clamp and the second clamp. It is provided at the end of the pipe to be welded at the welding groove provided at the end of the fixed pipe, and the welding groove is butt-aligned to fix the fixed pipe and the pipe to be welded. After aligning the position with the pipe alignment device and attaching the pipe alignment device to the fixed pipe and the pipe to be welded, attach the automatic welding device to the fixed pipe with the frame so that the welding torch is on the circumference of the welding groove. , Then, it is possible to automatically perform temporary welding in which the welding torch is moved by the driving device on the circumference of the welding groove by a predetermined circumferential length, and main welding in which the welding torch is moved over the entire circumference of the welding groove. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram comparing a work procedure up to main welding in a pipe welding method using one pipe welding apparatus of the present invention and a conventional pipe welding method. In the conventional example, as shown in FIG. 1B, (I) pipe setup, (II) installation / alignment of a pipe alignment device, (III) temporary welding (hand welding), (IV) pipe alignment device (V) Installation of automatic welding equipment, (V)
The procedure is I) automatic welding (main welding). Of particular note is that manual welding was required in procedure (III), and pipe alignment as seen from procedures (II) to (V). This means that the automatic welding device could not be installed while the device was installed in the pipe. On the other hand, according to the pipe welding method of the present invention, FIG.
As shown in (b), the procedure moves from (II) to (V), and the automatic welding device can be attached to the pipe together with the pipe alignment device, so temporary welding by program-controlled automatic welding becomes possible. , Manual welding can be eliminated.

2 to 4 are views showing a first embodiment of the pipe welding apparatus of the present invention, FIG. 2 is a front view, FIG. 3 is a plan view, and FIG. 4 is a side view. The pipe welding apparatus according to this embodiment includes a pipe alignment device 10 and an automatic welding device 40.

The pipe alignment device 10 is roughly classified into a first clamp 11 that holds the fixed pipe 1, a second clamp 21 that holds the welded pipe 2, and a connector 31 that connects the first clamp 11 and the second clamp 21. It consists of and. More specifically, the first clamp 11 includes a horizontal beam 12, a fixed column 13 hanging from the center of the horizontal beam 12, and a fixed column 13 thereof.
Two lever pairs 14 that are pin-joined to the horizontal beam 12 and are suspended on both sides of the column, and a fastening screw 15 that connects the fixed column 13 and the lever pair 14 and rotates the lever pair 14 to open and close the legs.
The fixed tube 1 is gripped at a total of three points, that is, the tip of the fixed column 13 and the tip of the lever pair 14.

The second clamp 21 includes a cross beam 22, a fixed column 23, a lever pair 24, and a tightening screw 2 having the same components as the first clamp 11.
Centering feed screw 2 including 5 and additionally passing through fixed column 23
6 and a swingable block 27 at the tip of the centering feed screw 26 are provided, and the block 27 is moved in the pipe radial direction by the rotation of the centering feed screw 26. Adjust the misalignment Δd. The welded pipe 2 is gripped by the tip of the block 27 and the tip of the lever pair 24 at a total of three points. The second clamp 21 is
The horizontal beam 22 has sliding surfaces at both ends and is connected to the connecting body 31 via the sliding surfaces.

The connecting body 31 is composed of two connecting rods 32 arranged in parallel, an end beam 33 and a feed screw 34, and the two connecting rods 32.
Each of them is connected to the cross beam 12 of the first clamp at one end, is connected to the cross beam 22 of the second clamp through the sliding surface in the middle, and is connected to the end beam 33 at the other end. . The feed screw 34 connects the end beam 33 and the second clamp 21. By rotating the feed screw 34, the second clamp 21 is slid in the pipe axial direction, and the fixed pipe 1 and the second welded portion are welded.
Adjust the clearance Δg.

The automatic welding device 40 includes a welding torch 41, a driving device 42 for rotating the welding torch 41 around the butt welding groove 3 of the fixed pipe 1 and the pipe to be welded 2, a welding torch 41 and a driving device 42. And a frame 43 for holding the fixed tube 1
In addition, the fixed pipe 1 can be mounted between the two connecting rods 32 of the pipe alignment device 10. Therefore, since the pipe alignment device 10 and the automatic welding device 40 can be attached to the pipe from the same direction on the outer circumference of the pipe, such as a thermal power plant, a nuclear power plant, and a gas hot water supply pipe in which pipes that cannot be manually welded are densely installed. Welding work can be performed even with fixed piping on site.

5 and 6 are views showing a second embodiment of the pipe welding apparatus of the present invention. In this embodiment, the pipe alignment device 50
Is a half-separable cylindrical clamp 51 that holds the fixed tube 1.
And a semi-dividable cylindrical clamp 5 for holding the pipe 2 to be welded
2 and the clamp 53 that connects the cylindrical clamps 51 and 52
Consists of. Further, the cylindrical clamp 51 is provided with several temporary attachment windows 54 on one circumference of the cylindrical portion, and a tapered portion is provided at the inner diameter of one end of the cylindrical portion. A tapered portion having the same gradient as the tapered portion of the cylindrical clamp 51 is provided on the inner diameter of one end of the cylindrical portion.

The automatic welding device 60 includes a welding torch 61, a driving device 62 that rotates the welding torch 61 around the butt welding groove 3 of the fixed pipe 1 and the pipe 2 to be welded, a welding torch 61 and a driving device 62. And a frame 63 for holding the fixed tube 1
Consists of.

Explaining the operation of this embodiment, first, the cylindrical clamp 51 is attached to the fixed tube 1 such that the center of the temporary attachment window 54 is located at the welding groove line of the fixed tube 1. Next, the other party's cylindrical clamp 52 is attached to the pipe to be welded 2. At this time, the fixed dimension 1 is set so that the welding groove between the fixed pipe 1 and the pipe to be welded 2 has a predetermined interval, that is, The welding is performed while keeping the distance from the groove surface of the welded pipe to the reference point of the cylindrical clamp 52. Then, the pipe to be welded 2 is inserted using the tapered portion of the inner surface of the cylindrical clamp 51 as a guide, and the fastener 5
The pipe 2 to be welded is attracted to the fixed pipe 1 by 3 and centered.
Since the mating surfaces of the cylindrical clamp 51 and the cylindrical clamp 52 have the same taper, the centering can be performed by pulling the fastener 53.

After the pipe alignment is completed, the automatic welding device 60 is attached to the fixed pipe 1 so that the welding torch 61 is located adjacent to the pipe alignment device 50 and on the circumference of the welding groove 3, and this automatic welding is performed. The tack welding is performed from the tack window 54 according to a predetermined program by the device 60. After tack welding, remove the pipe alignment device 50 and use the automatic welding device 60.
To perform main welding. In the present embodiment, temporary welding is performed by automatic welding as described above, so temporary welding by manual welding can be eliminated.

FIG. 7 is a view showing a third embodiment of the pipe welding apparatus of the present invention, which is an embodiment in which the fixed pipe 1 is a straight pipe and the welded pipe 4 is a bent pipe. The pipe alignment device 50 includes a cylindrical clamp 51 that holds the fixed pipe 1 and is capable of being divided in half, and a bent pipe 4.
A half-dividable cylindrical clamp 55 for gripping, a fastener for connecting the cylindrical clamps 51, 55, and a tightening screw 56 provided at several positions on the circumference of the cylindrical clamp 55 for fixing the bent pipe 4. In this embodiment, the second
It is a modification of the embodiment. In this embodiment, a tightening screw 56 is provided so that the cylindrical clamp 55 that holds the bent tube 4 can hold the curved surface of the bent tube 4, and that the inner diameter of the cylindrical clamp 55 does not interfere with the bent tube 4. The difference from the second embodiment is that it is increased, and the other parts are the same. Since the automatic welding device 60 is also the same as that of the second embodiment, the operation of the device and the welding method are almost the same.

FIG. 8 is a diagram showing a fourth embodiment of the pipe welding apparatus of the present invention, in which the pipe alignment device 70 and the automatic welding device 80 are integrated. The pipe alignment device 70 includes a cylindrical clamp 71 that can hold a fixed pipe 1 and can be divided in half, a cylindrical clamp 72 that can hold a bent pipe 4 that is a pipe to be welded, and a cylindrical clamp 71, 72. Cylindrical clamp 7 via bearings 74 that can be divided in half on each circumference
Cylindrical frame 73 capable of being divided in half for connecting 1, 72
The cylindrical frame 73 is rotatable around the pipe circumference via a bearing 74. In addition, the automatic welding device 80 in which the cylindrical clamp is provided with a tightening screw 75 for gripping the curved surface of the bent pipe 4, the torch 81 inserted in the welding torch holder 82 provided in the cylindrical frame 73, and the welding torch 81 are welded. Drive device 83 for traveling the torch 81 around the circumference of the welding groove
The electric motor 84 of the drive device and the pinion 85 directly connected to the electric motor 84 of the drive device are provided on the cylindrical clamp 71, and
A gear 86 capable of being split in half that meshes with the pinion is mounted on the cylindrical frame 73. In the welding according to the present embodiment, temporary welding and main welding can be continuously performed by program control.

According to this type of pipe welding device, not only temporary welding by hand welding is not necessary for pipe alignment work, but also the welding torch and torch drive to the pipe alignment device according to the order of pipe alignment and welding work. It is also possible to separately incorporate parts and the like, and the weight of the device can be divided, so that the workability can be improved and the maintainability of the device can be improved because of the dividing method.

The automatic pipe welding apparatus of the first, second, and fourth embodiments of the present invention described above is preferably selected by applying a convenient one according to the pipe diameter, pipe shape, and working conditions to be applied. Whichever type of automatic pipe welding apparatus is used, temporary welding by manual welding can be eliminated in the welding of fixed piping on site.

〔The invention's effect〕

According to the pipe welding method and the device thereof of the present invention described above, the temporary welding is automatically performed by the automatic welding device in the state where the fixed pipe and the pipe to be welded are aligned, on the circumference of the welding groove. Manual welding can be performed by automatically welding the entire circumference on the weld groove circumference by welding any circumference and performing the temporary welding after tack welding with the same equipment as the automatic welding equipment. The temporary welding can be automatically performed even by a general worker in place of a qualified welding person, and the subsequent main welding can be performed automatically to improve efficiency and improve welding reliability. .

Further, the fixed pipe is held by the first clamp, the welded pipe is held by the second clamp, and the welded groove provided at the end of the fixed pipe is welded by the connecting body that connects the first clamp and the second clamp. Provided at the end of the pipe, align the welding groove with the pipe alignment device that fixes the fixed pipe and the welded pipe by aligning the weld groove, and after installing the pipe alignment device on the fixed pipe and the welded pipe, The automatic welding device is attached to the fixed tube by the frame so that the welding torch is on the circumference of the welding groove, and then the welding torch is temporarily moved by the driving device on the circumference of the welding groove for a predetermined length. Since it is possible to automatically perform main welding in which welding and the entire circumference of the weld groove are moved, temporary welding that was conventionally performed by manual welding can be eliminated, and temporary welding by automatic welding is possible. And general work without welding qualification But it can be done temporarily with work, followed by the welding also automatically performed to be carried out, improvement of efficiency, to improve the reliability of the welding can be achieved.

[Brief description of drawings]

FIG. 1 is a work flow comparison diagram of a pipe welding method according to the present invention and a conventional pipe welding method, FIG. 2 is a diagram showing a first embodiment of the present invention, FIG. 3 is a plan view of FIG. 2, and FIG. 2 is a side view of FIG. 2, FIG. 5 is a view showing a second embodiment of the present invention, FIG. 6 is a plan view of FIG. 5, FIG. 7 is a view showing a third embodiment, and FIG. FIG. 8 is a diagram showing a fourth embodiment. 1 ... Fixed pipe, 2 ... Pipe to be welded, 3 ... Weld groove, 4 ...
… Bending pipe, 10 …… Piping alignment device, 11 …… First clamp (fixed pipe side), 21 …… Second clamp (welded pipe side), 31 …… Coupling body, 40 …… Automatic welding device, 41 ...
… Welding torch, 42… Drive device, 43… Frame,
50 ... Piping alignment device, 51 ... Cylindrical clamp (fixed pipe side), 52 ... Cylindrical clamp (welded pipe side), 55 ... Cylindrical clamp (curved pipe side), 60 ...
Automatic welding device, 61 ... Welding torch, 62 ... Driving device, 63 ... Frame, 70 ... Piping alignment device, 7
1 ... Cylindrical clamp (fixed tube side), 72 ... Cylindrical clamp (curved tube side), 73 ... Cylindrical frame, 80 ...
Automatic welding device, 81 ... Welding torch, 83 ... Drive device.

Front page continuation (72) Inventor, Houji Sakuma 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd., Hitachi Works (72) Inventor, Takeshi Yamade 3-1-1, Saiwaicho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Ltd., Hitachi Works (72) Inventor Masayoshi Yamaguchi 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd., Hitachi, Ltd. (72) Inventor Hidemasa Takada Toride City, Ibaraki Prefecture 4786-3 Terada (72) Makoto Iwamura 2640-30 Iijima-cho, Sakae-ku, Yokohama-shi, Kanagawa (56) References JP-A-56-91996 (JP, A) JP-B 56-18000 (JP, B2)

Claims (4)

[Claims] 1. A stationary fixed pipe and a pipe to be welded to be welded to the fixed pipe are gripped, and welding grooves provided at the ends of the fixed pipe and the pipe to be welded are butted against each other to perform centering, In this pipe welding method for automatically welding the weld groove of the fixed pipe and the welded pipe that have been butt-joined, an automatic welding device automatically determines an arbitrary circumference on the circumference of the weld groove of the fixed pipe and the welded pipe. The temporary welding is carried out by welding to the main welding, and the main welding performed after this temporary welding is automatically performed on the entire circumference of the circumference of the welding groove by the same device as the automatic welding device that performed the temporary welding. A pipe welding method characterized by welding. 2. A first clamp for holding a stationary fixed pipe, a second clamp for holding a welded pipe to be welded to the fixed pipe, the first clamp and a second clamp, and the fixed pipe, And a pipe alignment device formed of a connecting body that abuts the weld groove provided at each end of the pipe to be welded, and the weld groove of the fixed pipe and the pipe to be welded abutted by the pipe alignment device. A welding torch for welding, a drive device for rotating the welding torch on the circumference of the weld groove where the fixed pipe and the pipe to be welded are joined, the drive device, and the welding torch, and the fixed pipe. An automatic welding device including a frame for gripping is provided, and each of the first clamp and the second clamp includes a horizontal beam, a fixed column that hangs from a central portion of the horizontal beam, and pins on the horizontal beam on both sides of the fixed column. Combined and suspended The second clamp includes two levers and a tightening screw that hinges with the levers and is rotatably connected to the fixed column to open and close the lever. Further, the second clamp extends axially through the fixed column. A first feed screw that hinges and moves in its axial direction; and a block provided at the tip of the first feed screw on the welded pipe side,
Two connecting rods connected to both ends of the horizontal beam of the first clamp and extended to each other, end beams connecting the extended ends of the two connecting rods, the end beams and a butterfly And a second feed screw which is rotatably connected to the second clamp and moves the second clamp in the pipe axial direction,
The pipe welding device, wherein the automatic welding device is mounted on the fixed pipe in a space formed by the first clamp, the second clamp, and the connection body. 3. A fixed clamp for holding a stationary fixed pipe, a second clamp for holding a welded pipe to be welded to the fixed pipe, the first clamp and a second clamp, and the fixed pipe, And a pipe alignment device formed of a connecting body that abuts the weld groove provided at each end of the pipe to be welded, and the weld groove of the fixed pipe and the pipe to be welded abutted by the pipe alignment device. A welding torch for welding, a drive device for rotating the welding torch on the circumference of the weld groove where the fixed pipe and the pipe to be welded are joined, the drive device, and the welding torch, and the fixed pipe. And an automatic welding device including a frame to be gripped, wherein the first clamp is formed in a semi-dividable cylindrical shape extending from the outer peripheral surface of the fixed pipe to the outer peripheral surface of the welded pipe, On the circumference of the welded groove At several spots, an opening for temporary welding and a taper portion of the inner diameter of the end of the cylindrical portion that extends to the outer peripheral surface of the pipe to be welded are provided, while the second clamp is provided on the pipe to be welded. The outer peripheral surface is formed in a semi-dividable cylindrical shape, and a tapered portion having the same gradient as the tapered portion is provided on the outer diameter of the fixed pipe side end of the cylindrical portion, and the connecting body is A pipe welding apparatus comprising a fastener for fitting and fixing a taper portion and a taper portion having an outer diameter. 4. A first clamp for holding a stationary fixed pipe, a second clamp for holding a welded pipe to be welded to the fixed pipe, the first clamp and a second clamp, and the fixed pipe, And a pipe alignment device formed of a connecting body that abuts the weld groove provided at each end of the pipe to be welded, and the weld groove of the fixed pipe and the pipe to be welded abutted by the pipe alignment device. A welding torch for welding, a drive device for rotating the welding torch on the circumference of the weld groove where the fixed pipe and the pipe to be welded are joined, the drive device, and the welding torch, and the fixed pipe. And an automatic welding device including a frame for gripping, wherein the first clamp and the second clamp are formed in a cylindrical shape that can be halved on the peripheral surfaces of the fixed pipe and the pipe to be welded, respectively. Half cut on the outer circumference of the cylinder Possible bearing rotatably mounted,
The connecting body is formed into a cylindrical shape that fits into each of the bearings and is capable of being divided in half, and the welding torch is mounted in a mounting hole provided on the peripheral surface of the connecting body. Is composed of a gear provided on the connecting body, a pinion provided on the first clamp and meshing with the gear, and an electric motor connected to the pinion, and the frame also serves as the first clamp. By doing so, the pipe aligning device and the automatic welding device are integrated with each other.