Heterogeneous metal stirring friction welding method

Abstract

The invention discloses a heterogeneous metal stirring friction welding method. The heterogeneous metal stirring friction welding method is carried out according to the following steps: a first metalplate with a high melting point and a second metal plate with a low melting point are cleaned to remove impurities and oil contaminations from the surfaces, and then dried, during welding, a to-be-welded seam is formed in the abutting position of the first metal plate and the second metal plate, the second metal plate is placed on the lower end face of a preheating head, a stirring needle extendsinto the to-be-welded seam, the preheating head and the stirring needle rotate and move along the to-be-welded seam, the preheating head is in front, the stirring needle is in back, the preheating head preheats the second metal plate close to the to-be-welded seam firstly, then the stirring needle conducts stirring friction welding on the first metal plate and the second metal plate along the to-be-welded seam, and after welding is completed, the first metal plate and the second metal plate are cooled. By adopting the heterogeneous metal stirring friction welding method, heterogeneous metal can be welded, and meanwhile, strength and toughness of the welded seam can further be ensured.

Description

technical field [0001] The invention relates to a welding method of heterogeneous metals, in particular to a friction stir welding method of heterogeneous metals. 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. Conte...

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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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