Long-life backfill stirring friction welding tool

Abstract

The invention relates to a long-life backfill stirring friction welding tool. The tool comprises a handpiece, a stirring needle, a shaft shoulder, a bushing, a back support and a heating lantern ring;the stirring needle, the shaft shoulder and the bushing are mounted on the handpiece, and the stirring needle and the shaft shoulder are rotationally connected with the handpiece; the back support comprises a connecting plate, a backing plate and a heating rod, wherein one end of the connecting plate is fixedly connected with the handpiece and the other end of the connecting plate extends below the bushing; the backing plate is horizontally arranged, the backing plate is fixedly connected to the connecting plate and corresponds to the upper and lower parts of the bushing; and the heating rodis vertically and fixedly connected to the lower portion of the backing plate, the diameter of the heating rod is smaller than the diameter of the backing plate, and the heating lantern ring is connected to the heating rod in a sleeved mode. According to the long-life backfill stirring friction welding tool, through arranging the heating lantern ring, the supporting backing plate can be heated, the welding spot position of a to-be-welded material can be heated in advance before welding, and the temperature at the position is increased, so that the residual stress on the material is reduced, and the generation of cold cracks is reduced; and meanwhile, the position is softened, the vertical jacking force borne by the stirring needle and the shaft shoulder is reduced, and the welding tool isprotected.

Description

technical field [0001] The invention relates to a backfill friction stir welding tool, in particular to a long-life backfill friction stir welding tool. Background technique [0002] Friction Stir Spot Welding (FSSW) is an innovative welding technology recently researched and developed on the basis of "linear" friction stir welding. FSSW can form spot welded lap joints, and its weld appearance is similar to that of resistance spot welding commonly used in aluminum alloy components, so it has high application value and research significance. [0003] The backfill welding method is to realize the welding of the joint by controlling the relative movement between the parts of the stirring head. The stirring head is mainly composed of three parts: the stirring needle, the shaft shoulder and the outermost bushing. During the welding process, the relative movement of the stirring needle and the shaft shoulder creates a cavity, and the plastic material is fused and stirred and fill...

AI Technical Summary

Problems solved by technology

[0006] The backfill friction stir spot welding tools disclosed in the above two invention patent applications need to frequently weld a single point position during use. In this process, when the temperature of the material to be welded is low, there is a large After welding, the weld is prone to cold cracks; at the same time, the stirring needle and the shaft shoulder will be subjected to a large vertical upsetting force, which is prone to deformation, which will easily lead to serious wear of the shaft shoulder and bushing, reducing the use of welding tools life

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