An Anti-Thinning, Wide Welding Width, Permanent Enhanced Friction Stir Welding Method

Abstract

The invention discloses a reinforced friction stir welding method for preventing thinning and improving surface forming through wide-width permanent reinforcing plates. The method includes the following steps that: (1) reinforcing plates are pre-arranged on the surfaces of base materials to be butted before welding is performed, solder is preset between the reinforcing plates and the surfaces of the base metals, wherein the solder is required to undergo a eutectic reaction with the base materials or can significantly dissolve the base materials; and (2) a tool with a needle is adopted to rub the surfaces of the reinforcing plates, and at the same time, friction stir butt welding (FSBW) between the base materials and friction stir lap welding (FSW) between the reinforcing plates / the surfaces of the base materials are realized. According to the reinforced friction stir welding method of the of the present invention, the base materials are covered with the permanent reinforcing plates, and therefore, non-thinning and smoothly-formed reinforced weld passes can be formed, and permanent cover weld passes similar to weld passes in arc-welded joints can be obtained. The method is used forthe friction stir welding of aluminum pressure vessels and dissimilar metals.

Description

technical field [0001] The invention belongs to the field of friction stir welding, and in particular relates to a "reinforced friction stir welding (R-FSW: reinforced FSW)" method using a wide-width permanent reinforcement plate cover, so as to prevent the base metal from being thinned and damaged after friction stir welding. Improve the smoothness of the surface forming of friction stir welding of dissimilar metals, and can be used for friction stir welding of aluminum pressure vessels and dissimilar metals. Background technique [0002] Friction stir welding (FSW: friction stir welding) without groove opening, preheating, and crystal cracks has been widely used in the welding of the same aluminum sheet, and can replace argon tungsten arc welding and inert gas shielding Arc welding. FSW can be further divided into friction stir butt welding (FSBW: friction stir butt welding) and friction stir lap welding (FSLW: friction stir lap welding). Among them, because the rotation...

AI Technical Summary

Problems solved by technology

[0016] There are two major problems in friction stir welding (FSBW: friction stir butt welding): (1) The same metal joint has the problem of thinning of the base metal thickness in the welding zone, which seriously affects the promotion and application of FSW in the aluminum pressure vessel industry; ( 2) The surface of dissimilar metal joints is rough (caused by the poor plasticity of the intermetallic compound formed by the dissimilar base metal under the shoulder), adhesion tools, and the thickness of the local weld bead in the stirring zone will be seriously thinned. An Enhanced Friction Stir Welding Method Using Wide Permanent Stiffeners to Prevent Thinning and Improve Surface Formation

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