Method for preparing joint made of dissimilar material by firstly ultrasonically prefabricating and secondly welding transition belt

Abstract

The invention discloses a method for preparing a joint made of a dissimilar material by firstly ultrasonically prefabricating and secondly welding a transition belt. The method comprises the main steps of stacking at least one layer of metal foil on the surface of a to-be-connected material through ultrasonic rolling welding to form a stacking layer; after the stacking layer is prepared, cutting off a foil disconnected part at the periphery of the stacking layer by a milling cutter of an ultrasonic rolling welding system, and milling the stacking layer to form the transition belt with a proper shape and a proper size; directly welding the transition belt with another to-be-connected metal by a fusion welding method, a braze welding method or a diffusion welding method so as to obtain the joint made of the dissimilar material with the macrostructure being formed by the to-be-connected material, the transition belt, a welding seam and another to-be-connected material. The technical scheme has the characteristics that through stacking the metal foil on the surface of the to-be-connected material to finally form the transition belt by utilizing the advantage of ultrasonic solid phase connection, welding of dissimilar hard-to-weld materials is indirectly converted into welding of two kinds of materials with metallurgy dissolvability, and then the joint made of the dissimilar material with reliable performance is prepared.

Description

technical field [0001] The invention belongs to the field of welding connection of dissimilar materials, and mainly relates to a process method for preparing joints of dissimilar materials by ultrasonic rolling welding of prefabricated transition zones, especially the advantages of good joint strength and low material type dependence obtained by ultrasonic rolling welding. Before the material is directly welded, the transition zone is prefabricated on the surface of the material to be connected by means of ultrasonic solid-phase bonding, and the direct welding between dissimilar materials is transformed into a new process method of welding between metallurgically tolerant materials. Background technique [0002] Since dissimilar material joints can combine the performance advantages of two metals, they are more and more widely used in the industrial field, for example, aluminum / steel dissimilar material joints, aluminum / copper dissimilar material joints, etc. At present, fus...

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Problems solved by technology

However, when the joints of dissimilar materials are simply welded by fusion welding, hard and brittle intermetallic compounds are often produced at the weld. Compounds, even if the static mechanical properties of the joints are guaranteed by optimizing the welding process, the dynamic mechanical properties of the joints in practical applications will be greatly reduced due to the existence of these brittle compound phases

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