Crimping diffusion welding process of aluminum or aluminum alloy and heterogeneous metal

Abstract

The invention discloses a crimping diffusion welding process and clamp of aluminum or aluminum alloy and heterogeneous metal, relating to the technical field of solid-state welding. The process comprises the following steps of: carrying out surface treatment on prewelded surfaces: overlapping the prewelded surfaces of a piece to be welded face to face together, then putting between an upper pressing plate and a lower pressing plate of the clamp, and carrying out cold pressing; putting the piece to be welded, which is tightly pressed and protected, and the whole clamp into a box-type electric furnace, heating, preserving the heat and prewelding; after diffusion welding is finished, taking the whole clamp out, and carrying out hot pressing on a hydraulic machine once; and then carrying out diffusion welding. The invention provides the process which is used for carrying out crimping diffusion welding of aluminum or aluminum alloy and heterogeneous metal under the non-vacuum condition by using the common hydraulic machine, the common box-type electric heating furnace and the clamp; meanwhile, a workpiece with large feature size and larger thickness is not limited by the traditional vacuum diffusion welding process.

Description

technical field [0001] The invention relates to the technical field of solid-state welding, in particular to a crimping diffusion welding process of aluminum or aluminum alloy and dissimilar metals and a fixture thereof. Background technique [0002] At present, since the aluminum alloy and pure copper or aluminum alloy and stainless steel and other dissimilar metals are welded, the oxide film on the aluminum surface is not easy to completely remove during the surface treatment process, which affects the progress of diffusion welding, so the aluminum alloy and pure copper or aluminum alloy and The welding of stainless steel is more difficult than the welding of aluminum to aluminum or copper to copper. There is a big difference between copper and aluminum in physical properties, especially the difference in melting point of 424 ° C, and the difference in linear expansion coefficient of more than 40%; and aluminum is easy to form Al when it encounters oxygen. 2 o 3 Oxide fi...

AI Technical Summary

Problems solved by technology

[0007] It takes a long time to do a vacuum diffusion welding, and only one workpiece can be welded at a time. The size and shape of the workpiece are also limited by the space of the vacuum diffusion welding furnace and the pressure of the machine. The welding efficiency is low and the cost is high. mass production requirements

Images