No-flash and no-thinning shaft shoulder-free friction stir welding tool and method

Abstract

The invention discloses a no-flash and no-thinning shaft shoulder-free friction stir welding tool and method. The welding tool comprises a shaft shoulder-free stir needle, a pressing plate, a welding-trailing block, a bearing, a welded part and a basal plate, wherein the pressing plate is used for pressing the welded part on the basal plate; a pressing plate matching body groove is formed in the pressing plate; a trapezoidal pressing plate matching body is arranged in the pressing plate matching groove; and the bearing is connected to the welding-trailing block. According to the welding tool and the method, the shaft shoulder-free stir needle and the pressing plate matched with the shaft shoulder-free stir needle are correspondingly designed according to the change of the thickness and theappearance of the welded part, so that a shaft shoulder-free stir needle matched body is well matched with a pressing plate matched body and a welding-trailing block matched body, and shavings are easy to remove; and meanwhile, no-flash and no-thinning friction stir welding is realized, the method is simple in design, the tool is convenient to install and the applicability is wide.

Description

technical field [0001] The invention discloses a non-flash and thinning non-shaft friction stir welding tool and method, and relates to the technical field of stirring tools. Background technique [0002] Since the friction stir welding technology was invented by the British Welding Institute in 1991, it has been widely used in aviation, aerospace and high-speed ships because of its low heat input, small welding deformation, good weld microstructure and mechanical properties, etc. , automobile industry, high-speed trains and other manufacturing fields. [0003] In order to overcome the limitations of welding flash and thinning of traditional friction stir welding technology, the British Welding Institute separated the shoulder from the stirring pin on the basis of traditional FSW, and developed the static shoulder friction stir welding technology. The existing "A New Type of Friction Stir Welding Tool with No Thinning of Material Surface After Welding" (CN201610524886.9) pr...

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Problems solved by technology

The existing "A New Type of Friction Stir Welding Tool with No Thinning of Material Surface After Welding" (CN201610524886.9) proposes a static shoulder friction stir welding welding device for flat plate butt joints, which solves the problem of friction stir welding. However, due to the complex structure and strict assembly requirements, the non-shouldered stirring needle and the static shoulder are easy to occlude, and it is difficult to realize engineering application; the existing foreign patents (US7404510B2, US 7416102B1) involve a non-shouldered Although the friction stir welding tool has realized the welding of unequal thick plates, it fails to solve the problems of welding flash and thinning, and is prone to welding defects; Head" (CN201310046262.7), although the welding flash has been reduced by improving the surface shape and structure of the non-shouldered stirring needle, it still cannot fundamentally solve the problem of welding flash in friction stir welding, and at the same time cannot solve the problem of welding thinning

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