CN100413630C

CN100413630C - Angle joint stirring and rubbing out weld method

Info

Publication number: CN100413630C
Application number: CNB2006100313196A
Authority: CN
Inventors: 贺地求; 邓航; 周鹏展; 梁建章
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2006-03-08
Filing date: 2006-03-08
Publication date: 2008-08-27
Anticipated expiration: 2026-03-08
Also published as: CN1810433A

Abstract

The present invention relates to an external-side stirring frictional angle joint welding method. The present invention is characterized in that the present invention adopts a method that an auxiliary technologic cushion block is spliced at the external side of an angle joint, and the top of the external side of the angle joint forms a plane which is needed for the friction of a stirring head platform shoulder; the method is used to convert angle joint welding of any angles into similar flat plate butt welding; friction heat generated by a backing board and the stirring head platform shoulder is used to heat an angle joint welding seam; a stirring friction angle joint welding seam is formed under the action of the combination of a stirring rod of stirring head and a heat machine. Compared with the existing angle welding method, the present invention has the advantages that the present invention has the advantages of any-angle welding and large welding thickness; besides, the present invention can carry out welding from the external side of an enclosed or semi-enclosed angle joint member.

Description

A kind of angle joint stirring and rubbing out weld method

[technical field]

The present invention relates to the method for the outer face down bonding of a kind of friction stir welding method, particularly corner connection.

[background technology]

Friction stir welding is a kind of new type low temperature solid phase interconnection technique.Be applicable to the low-melting alloy that is difficult to molten solder, each state is all in competitively research and development, in field extensive application such as space flight and aviation, boats and ships, bullet train, armored combat vehicles at present.But most of engineering Welding Structures adopt section bar or sheet material to constitute in the corner connection mode, and therefore, friction stir welding technology will obtain one of important prerequisite of extensive use and be, can realize fillet welding at any angle.At present, friction stir welding is to butt weld, comprise dull and stereotyped butt joint and curved surface butt joint, existing mature technology and equipment, the right angle connected 90 ° of welding are also available to be converted into docking mode and to weld, but to corner connection at any angle, also do not have ripe otherwise effective technique and method that the structural member of complex appearance is welded, realize that fillet welding at any angle is the essential step that friction stir welding enlarges range of application.Xiang Guan Japanese patent of invention (2001-321965) therewith, this patent proposes a kind ofly to establish a technology cushion block with triangular section from corner connection seam inboard (angle＜180 a ° side), fill and lead up angle in the welding, splash bar passes the technology cushion block during welding, enter the weldment seam, shoulder then with the cushion block mantle friction, realize the corner connection welding.There is following shortcoming in this method: one, and the actual welding degree of depth is much larger than the solder joint degree of depth, and the weldment angle is more little, and problem is outstanding more, is difficult to carry out the corner connection of low-angle slab; Its two, the good seam organization in upper strata is distributed on the technology cushion block, is unfavorable for improving the weld seam actual strength; Its three, some sealings or semi-enclosed welded unit are limit because of the space, are difficult to carry out from the inboard agitating friction welding.

[summary of the invention]

The present invention utilizes at the outside, to-be-welded pieces bight edge and pieces together the auxiliary process cushion block, planar structure is formed on corner connection weld seam top constituting at any angle, solve of the specific (special) requirements of friction stir welding technology to the welding position, stirring-head with the hot machine of the backing plate that constitutes planar structure on, the frictional heat that the stirring-head shoulder is produced is efficiently imported into and is treated in the weldment joint metal, and under the hot machine synergy of splash bar, realize that the high-quality at fillet welding position connects at any angle.

Fillet welding connection of the present invention can realize fillet welding at any angle, can be big from sealing or the outside welding of semiclosed corner connection member, throat thickness, can finish the high-quality welding of the structural member of complex appearance.

Below in conjunction with accompanying drawing the present invention is further detailed.

[description of drawings]

Fig. 1 is the angle joint stirring and rubbing out weld fundamental diagram;

Fig. 2 is a lateral angle welding seam fracture morphology;

Fig. 3 is a low-angle corner connection chamfering weldering method schematic diagram.

[embodiment]

The present invention is spliced in the weld seam outside by auxiliary cushion block of adopting process and actual weldment, and fillet welding is converted into similar butt plates welding.

As shown in Figure 1,1 and 2 for treating weldment, and 3 and 4 are the auxiliary cushion block of technology, and 5 is stirring-head.If treating the corner connection half-angle of weldment 1,2 is α, the angle of its actual welding is 2 α, after the welding, welds 1 and 2.

Cushion block

3,4 processing is angled the groove of β, and makes alpha+beta=90 °.The main effect that should assist cushion block is the splicing by angle, form the required shoulder frictional plane of friction stir welding, angled friction stir welding is converted into butt plates welding,, the heat that produces is passed to the actual weldment for the treatment of by stirring-

head

5 and 3,4 mantle frictions of forming.

Stirring-head 5: produce on the heat transferred welded plate by planar friction, make welded plate reach the situation that can stir, under the stirring action of its splash bar, finish friction stir welding then in certain regional metal plasticizing with

cushion block

3,4 compositions.

Weld the back and removed the technology cushion block, can obtain the friction stir welding angle joint, Figure 2 shows that the weld seam fracture morphology that adopts the outer face down bonding method of this angle joint

During welding low-angle angle joint, remove wedge angle, can solder joint thickness greater than the angle joint of splash bar length, Figure 3 shows that low-angle corner connection chamfering weldering method schematic diagram, A is a seam caliper among the figure, and B is a splash bar length, after removing wedge angle, the available short thicker weld seam of splash bar welding, i.e. A＞B.

Claims

1. angle joint stirring and rubbing out weld method, it is characterized in that: edge is pieced together the auxiliary process cushion block in the angle joint outside, form planar structure with the bight of to-be-welded pieces, constitute the required plane of stirring-head shoulder friction in the angle joint outside top, fillet welding at any angle is converted into butt plates welding, described edge is pieced together the angle of auxiliary process cushion block and is determined that method is, the bevel angle that the half-angle of two to-be-welded pieces angles and auxiliary process cushion block are processed into and be 90 °.