CN105772934A - Thick metal plate right-angle friction stir welding structure and method - Google Patents

Abstract

A metal thick plate right-angle friction stir welding structure and its welding method. Two matching first metal thick plates and second metal thick plates are welded by friction stir to form a whole corner piece whose included angle is a right angle. The first right angle A first concavo-convex structure with alternating concavo-convex structures is provided at the butt end, a second concavo-convex structure with alternate concavo-convex structures is provided at the second right-angled butt end, and the first concavo-convex structure matches the second concavo-convex structure. The first concave-convex structure is provided with alternate first convex portions and first concave portions; the second concave-convex structure is provided with alternately second convex portions and second concave portions. The metal thick plate right-angle friction stir welding structure and its welding method can increase the actual connection surface area of the metal thick plate in friction welding, thereby improving the structural strength of the right-angle welding place.

Description

A metal thick plate right-angle friction stir welded structure and its welding method

technical field

The invention relates to the technical field of metal thick plate welding, in particular to a metal thick plate right-angle friction stir welding structure and a welding method thereof.

Background technique

At present, traditional fusion welding methods such as submerged arc welding are mainly used in the industry to weld thick metal plates through surfacing welding. However, due to fusion welding, the welded joints are prone to defects such as oxidation and pores, and the joint performance is poor. However, friction stir welding has been widely used because it solves the problems of easy oxidation and porosity of traditional fusion welding. At present, friction stir welding is mainly used in the butt joint of thin metal plates. For the welding of thick metal plates, many people propose to use Enlarging the stirring head, lengthening the stirring needle and double-sided friction stir welding technology. However, in order to ensure sufficient heat input after increasing the stirring head and lengthening the stirring needle, the requirements for equipment quality increase exponentially with the increase of the thickness of the weldment, and the conventional friction stir welding machine cannot meet the requirements. In addition, for metal thick plates that need to be welded at right angles or workpieces with thick plate-like protruding ends, double-sided friction stir welding obviously does not meet the welding prerequisites.

Therefore, in view of the deficiencies of the prior art, it is necessary to provide a right-angle friction stir welded structure of thick metal plates with good structural strength at the weld and its welding method to overcome the deficiencies of the prior art.

Contents of the invention

The object of the present invention is to avoid the deficiencies of the prior art and provide a metal thick plate right-angle friction stir welding structure and its welding method. The metal thick plate right-angle friction stir welding structure and its welding method have good structural strength at the weld features.

The above object of the present invention is achieved through the following technical means.

A right-angle friction stir welding structure of thick metal plates is provided, in which two matched first thick metal plates and second thick metal plates are welded by friction stir to form a whole corner piece whose included angle is a right angle, the first thick metal the plate is provided with a first right angle butt end and the second metal slab is provided with a second right angle butt end;

The first right-angle butt end is provided with a first concave-convex structure with alternating concave and convex, the second right-angle butt end is provided with a second concave-convex structure with alternating concave and convex, the first concave-convex structure matches the second concave-convex structure, The first right-angle butt end and the second right-angle butt end are spliced by the first concave-convex structure and the second concave-convex structure to form a whole corner piece.

Preferably, the above-mentioned first concave-convex structure is arranged at the position of the 45 ^° inclined surface of the first direct butt end, and the first concave-convex structure is provided with alternate first convex parts and first concave parts;

The second concave-convex structure is arranged at the position of the 45 ^° inclined surface of the second direct abutting end, and the second concave-convex structure is provided with alternately second convex parts and second concave parts.

Preferably, the first convex angle A1 of the above-mentioned first convex portion is the same as the first concave angle B1;

The second protrusion angle A2 of the second protrusion is the same as the second recess angle B2; and A1 is equal to A2.

Preferably, the length L1 of the first convex portion is equal to the length S1 of the first concave portion;

The length L2 of the second protrusion is equal to the length S3 of the second recess, and L1 is equal to L2.

Preferably, the length L1 of the first protrusion is equal to the thickness H1 of the first thick metal plate; the length L2 of the second protrusion is equal to the thickness H2 of the second thick metal plate. The length L1 of the first protrusion is greater than 20 mm.

In the right-angle friction stir welding structure of thick metal plates of the present invention, the first right-angle butt end is provided with a first concave-convex structure with alternating concavo-convex structures, and the second right-angle butt-joint end is provided with a second concavo-convex structure with alternating concavo-convex structures. The metal thick plate right-angle friction stir welding structure can increase the actual connection surface area of the metal thick plate in the friction welding by setting the first direct butt end and the second direct butt end with matching concave-convex structures, thereby improving the right-angle weld. Structural strength.

The present invention also provides a method for right-angle friction stir welding of thick metal plates. The two metal plates to be welded are respectively processed into the structures of the first thick metal plate and the second thick metal plate, and then the two metal plates are spliced together. Friction stir welding is performed on both ends of the right angle by the stir welding method.

In the right-angle friction stir welding method for metal thick plates of the present invention, two metal plates to be welded respectively have a first concave-convex structure and a second concave-convex structure before performing friction stir welding, which can increase the actual connection surface area of the metal thick plates in friction welding , thereby improving the structural strength of the right-angle weld.

Description of drawings

The present invention will be further described by using the accompanying drawings, but the content in the accompanying drawings does not constitute any limitation to the present invention.

Fig. 1 is a schematic diagram of the welding state of the metal thick plate right-angle friction stir welded structure of the present invention.

Fig. 2 is a structural schematic diagram of the disassembled state of the first thick metal plate and the second thick metal plate of the right-angle friction stir welded structure of thick metal plates according to the present invention.

In Figure 1 to Figure 2, including:

the first metal slab 100,

The first convex portion 110, the first concave portion 120,

second thick metal plate 200,

The second convex portion 210, the second concave portion 220,

Stirring head 300.

detailed description

The present invention is further described in conjunction with the following examples.

Example 1.

A right-angle friction stir welding structure of metal thick plates, as shown in Figure 1 and Figure 2, two matched first metal thick plates 100 and second metal thick plates 200 are welded by friction stir to form a right angle The corner piece as a whole. The first thick metal plate 100 is provided with a first right-angle butt end, the second thick metal plate 200 is provided with a second right-angle butt end, the first thick metal plate 100 and the second thick metal plate 200 pass through the first right-angle butt end, Direct butt ends fit for welding.

The first right-angle butt end is provided with a first concave-convex structure with alternating concave and convex, the second right-angle butt joint is provided with a second concave-convex structure with alternating concave and convex, the first concave-convex structure matches the second concave-convex structure, the first right-angle butt end and the second The right-angled butt ends are spliced by the first concave-convex structure and the second concave-convex structure to form a whole corner piece, and the butt joint surfaces are welded by stirring friction.

Specifically, the first concave-convex structure is arranged at the position of the 45 ^° inclined surface of the first direct abutting end, and the first concave-convex structure is provided with alternately first convex portions 110 and first concave portions 120 .

The second concave-convex structure is arranged at the position of the 45 ^° inclined surface of the second direct abutting end, and the second concave-convex structure is provided with alternately second convex portions 210 and second concave portions 220 .

The first concave-convex structure and the second concave-convex structure are assembled to realize the splicing of the right-angle structure, and after the splicing, the two ends of the right-angle are friction stir welded by means of friction stir welding through the stirring head 300 . The specific friction stir welding pass can continue single-pass or multi-pass welding at both ends according to the actual plate thickness. The metal thick plate right-angle friction stir welding structure can increase the actual connection surface area of the metal thick plate in the friction welding by setting the first direct butt end and the second direct butt end with matching concave-convex structures, thereby improving the right-angle weld. Structural strength.

Preferably, the first protrusion angle A1 of the first protrusion 110 is the same as the first recess angle B1; the second protrusion angle A2 of the second protrusion 210 is the same as the second recess angle B2; and A1 is equal to A2.

The length L1 of the first protrusion is equal to the length S1 of the first recess 120; the length L2 of the second protrusion 210 is equal to the length S3 of the second recess 220, and L1 is equal to L2.

The length L1 of the first protrusion 110 is equal to the thickness H1 of the first thick metal plate 100 ; the length L2 of the second protrusion 210 is equal to the thickness H2 of the second thick metal plate 200 . The length L1 of the first protrusion 110 is greater than 20 mm.

The metal thick plate right-angle friction stir welding structure can increase the actual connection surface area of the metal thick plate in friction welding, thereby improving the structural strength of the right-angle weld, and has the characteristics of simple structure and convenient processing and preparation.

It should be noted that the structure and size of the first convex portion, the second convex portion, the first concave portion, and the second concave portion are not limited to the situation of this embodiment, and can also be set to different structures according to specific needs, as long as the first convex portion is satisfied. It only needs to match the first concave-convex structure and the second concave-convex structure.

Example 2.

A method for right-angle friction stir welding of thick metal plates, in which two metal plates to be welded are respectively processed into the structures of the first thick metal plate and the second thick metal plate, and then the two metal plates are spliced together and welded by stirring welding. Friction stir welding is performed at both ends of the right angle. In the right-angle friction stir welding method for metal thick plates, the two metal plates to be welded respectively have a first concave-convex structure and a second concave-convex structure before performing friction stir welding, which can increase the actual connection surface area of the thick metal plates during friction welding, thereby Improves structural strength at right-angle welds.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that Modifications or equivalent replacements are made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. A metal thick plate right-angle friction stir welded structure, the first metal thick plate and the second metal thick plate that are matched with each other are welded by friction stir mode to form a corner fitting whole that the included angle is a right angle, it is characterized in that: The first thick metal plate is provided with a first right-angle butt end, and the second thick metal plate is provided with a second right-angle butt end; the first right-angle butt end is provided with a first concave-convex structure with alternating concavities and convexities, and the second The right-angle butt end is provided with a second concave-convex structure with alternating concave and convex, the first concave-convex structure matches the second concave-convex structure, and the first right-angle butt end and the second right-angle butt end pass through the first concave-convex structure, The second concave-convex structure is spliced to form the whole corner piece and welded by friction welding. 2. The metal thick plate right-angle friction stir welding structure according to claim 1, characterized in that: the first concave-convex structure is arranged at the position of the 45 ^° inclined surface of the first direct butt joint end, and the first concave-convex structure is provided with mutual Alternate first protrusions and first recesses; the second concave-convex structure is arranged on the 45 ^° inclined surface of the second direct abutment end, and the second concave-convex structure is provided with alternate second convex parts and second concave parts. 3. The metal thick plate right-angle friction stir welding structure according to claim 2, characterized in that: the angle of the first convex angle A1 of the first convex part is the same as the angle of the first concave angle B1; The second convex angle A2 of the protrusion is the same as the second concave angle B2; and A1 is equal to A2. 4. The metal thick plate right-angle friction stir welding structure according to claim 3, characterized in that: the length L1 of the first protrusion is equal to the length S1 of the first recess; the length L2 of the second protrusion is equal to The lengths S3 of the second recesses are equal, and L1 is equal to L2. 5. The metal thick plate right-angle friction stir welded structure according to claim 4, characterized in that: the length L1 of the first protrusion is equal to the thickness H1 of the first thick metal plate; the length of the second protrusion is L2 is equal to the thickness H2 of the second metal slab. 6 . The right-angle friction stir welded structure of thick metal plates according to claim 5 , wherein the length L1 of the first protrusion is greater than 20 mm. 7. A right-angle friction stir welding method for thick metal plates, characterized in that: the two metal plates to be welded are respectively processed into the first thick metal plate and the second thick metal plate according to any one of claims 1 to 6 structure, and then splice the two metal plates, and perform friction stir welding on both ends of the right angle by stir welding.