Dissimilar metal material brazing method

Abstract

The invention discloses a dissimilar metal material brazing method. The dissimilar metal material includes a first base metal and a second base metal different from each other. The method comprises the following steps: clamping the first base metal on a telescopic fixture and clamping the second base metal on a fixed fixture in such a manner that the welding surfaces of the first base metal and the second base metal face to each other, and placing a solder between the welding surfaces; applying a pre-pressure on the first base metal relative to the welding surface; locally rapidly heating thewelding parts of the first base metal and the second base metal to a preset temperature and keeping the temperature; increasing the pre-pressure to a welding pressure; applying ultrasonic vibration to the first base metal relative to the welding surfaces by an ultrasonic compression bar; and continuously keeping the temperature and the pressure after the ultrasonic vibration completes, stopping heating, and further keeping the pressure until the welding parts are cooled. The method can improve the strength of a brazed joint of dissimilar metal materials by reducing the formation of laminar brittle intermetallic compounds and the like.

Description

technical field

[0001] The invention relates to a brazing method between metal materials, especially a brazing method suitable for welding heterogeneous metal materials such as copper or copper alloy and aluminum or aluminum alloy, stainless steel and aluminum or aluminum alloy, stainless steel and magnesium alloy Welding method. Background technique

[0002] In recent years, domestic and international copper prices have continued to rise, which has brought great cost pressures to manufacturing industries such as refrigeration, electronics, and automobiles. The main application value of copper is that this material has excellent electrical and thermal conductivity. Due to the small amount of copper stored in the earth's crust, there is no doubt that the price of copper will continue to rise. Therefore, it is a common starting point for companies to save costs to find a material with performance close to that of copper and a relatively low price to replace copper. The elect...

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