Method for preparing interface layer for dissimilar metal connection and welding method based on interface layer

Abstract

The invention provides a method for preparing an interface layer for dissimilar metal connection and a welding method based on the interface layer. The method comprises the steps that firstly, a layer of AlNi intermetallic compound film with the nanoscale thickness is deposited on the surface of steel through a vapor deposition method, and an AlNi intermetallic compound is of a simple cubic structure; secondly, the nanoscale AlNi intermetallic compound film deposited on the surface of the steel serves as the interface layer for connection of a magnesium alloy and the steel; and thirdly, metallurgical connection of the magnesium alloy / preset AlNi intermetallic compound layer steel is achieved through an ultrasonic spot welding method, and an interface connection structure of the magnesium alloy / AlNi intermetallic compound layer / steel is obtained by optimizing welding process parameters. According to the method, by presetting the interface layer, controlling the type and the thickness of the interface layer, and meanwhile promoting the metallurgical reaction between the interface layer and base metal alloy elements on the two sides and keeping the structural integrity of the interface layer, the method has the characteristic that the type and the thickness of the interface layer are adjustable, batch production is facilitated, and the application range can be expanded.

Description

technical field [0001] The invention relates to the preparation of an interface layer for connection of dissimilar metals and a welding method based on the interface layer. Background technique [0002] Under the background of global participation in energy conservation and emission reduction, lightweight has gradually become an important development direction of the manufacturing industry. Improving the strength of the base metal and selecting lightweight materials are the main means to achieve lightweight. With the in-depth application of high-strength structural materials and light metal materials in aerospace, automobile, 3C and other fields, the design and manufacturing technology of multi-material composite structures have made great progress in the above fields. Magnesium alloy has the characteristics of high specific strength, good shock absorption performance, and low density, while steel, as the most widely used metal material, has the characteristics of high stre...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a solution to the problem of insufficient solid-solution and non-reactive dissimilar metal connection interface reaction, and to promote the metallurgical connection of difficult-solid-solution and non-reactive dissimilar metals by adding a preset film (interface layer) , and through a welding method, while ensuring that the interface layer is not damaged, metallurgical welding of dissimilar metals that are difficult to solid solution and do not react