Agitation friction point braze welding method for metal plate overlap joint combination

Abstract

The invention discloses an agitation friction point braze method for a metal plate overlap joint combination. The method comprises the following steps: placing a brazing filler metal at a to-be-welded position in advance, starting a needle-free tool to rotate, and melting the brazing filler metal by virtue of frictional heat between a shoulder and the surface of an upper plate; after in-situ friction is performed for few seconds, shutting down, and applying upset forging, thereby finishing a large-area spot welding process under the condition of no abrasion and no key holes. By virtue of the twisting effect of a tool on an interface in a friction stage, the dissolution effect of the brazing filler metal on a mother metal in an in-situ friction stage and the upset forging effect of the tool on the interface in a shutdown stage, an oxidation film is easily broken, and oxidation film fragments are easily extruded along with the molten brazing filler metal which is alloyed; meanwhile, the interface wetting property and final compactness are improved, crystal structures containing brittle phases are eliminated, the soldering seam tenacity is improved, and the method can be used in occasions such as electric power fittings, electric contacts, cookers, hybrid electric vehicle series welding and overlap joint welding of thin aluminum plates in automobile and aircraft manufacturing.

Description

technical field [0001] The invention belongs to the field of welding, and relates to a partial lap joint method for overlapping joints of copper, aluminum, silver, etc., in particular to a friction stir point brazing method for lap joints of copper, aluminum, silver, and other metal plates. Background technique [0002] Traditional resistance spot welding has the obvious advantages of high efficiency and protection-free, but it has the following disadvantages: (1) high energy consumption: the power supply is required to provide high power instantly, and the power supply capacity is demanding; (2) it is not suitable for copper and aluminum base materials , Silver base material with very low resistivity. In recent years, inspired by the friction stir welding method invented by the British Welding Institute in 1991, Japan and Germany have successively reported two new techniques for achieving spot welding by friction: (1) Friction stir spot welding using traditional needle tool...

AI Technical Summary

Problems solved by technology

[0002] Traditional resistance spot welding has the obvious advantages of high efficiency and protection-free, but it has the following disadvantages: (1) high energy consumption: the power supply is required to provide high power instantly, and the power supply capacity is demanding; (2) it is not suitable for copper and aluminum base materials , Silver base material with very low resistivity

Although this technology has the advantage of being able to backfill the keyhole, the disadvantages are: (1) The design and preparation of the tool are complicated and the operation is complicated; (2) The welding area is limited; (3) When there is a base material with high strength, the needle wears seriously

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