Multi-needle type friction welding stirring head

Abstract

The invention discloses a multi-needle type friction welding stirring head which comprises an outer shell and two rotating parts. The outer shell is of a hollow structure, and the rotating parts are arranged in the outer shell. Each rotating part comprises a rotating shaft which is vertically arranged. Two rotating holes penetrate the bottom of the outer shell, the rotating holes correspond to therotating shafts one by one, the lower ends of the rotating shafts stretch into the corresponding rotating holes, a preheating head is mounted at the lower end of one rotating shaft, and a stirring needle is mounted at the lower end of the other rotating shaft. According to the multi-needle type friction welding stirring head, the lower end surface of the preheating head rubs a metal upper surfacewhich is relatively high in melting point first to improve the temperature during welding, then the stirring needle stretches into metal plate joints of different materials, and the lower end surfaceof a friction seat leans against the metal plates of different materials and rub to generate heat, so that the metal plate joints of different materials are softened. The stirring head rotates at a high speed for friction stirring of the metal plate joints of different materials for welding, and the strength and toughness of a weld joint are guaranteed.

Description

technical field [0001] The invention relates to a stirring head, in particular to a multi-pin friction welding stirring head. Background technique [0002] Friction stir welding refers to the use of the heat generated by the friction between the high-speed rotating welding tool and the workpiece to locally melt the welded material. When the welding tool moves forward along the welding interface, the plasticized material is under the action of the rotating friction of the welding tool. It flows from the front of the welding tool to the rear, and forms a dense solid-phase weld under the extrusion of the welding tool. [0003] Metals of different materials have different melting points. When joining by friction stir welding, metals with lower melting points will soften first during friction stirring, while metals with higher melting points have not yet reached the temperature required for softening, so they cannot be welded directly. Contents of the invention [0004] In vie...

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Problems solved by technology

[0003] Due to the different melting points of metals of different materials, when friction stir welding is used to join, the metal with a lower melting point will soften first during friction stirring, while the metal with a higher melting point has not yet reached the temperature required for softening, so it cannot be directly welded

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