A kind of anti-crack multilayer aluminum alloy with low melting point brazing layer and preparation method thereof

Abstract

The invention discloses a low-melting point brazing layer anti-cracking multi-layer aluminum alloy to solve the problems existing in the prior art that the addition of copper is not conducive to rolling, and also makes the potential positive, which is not conducive to the potential matching of each layer, especially when the copper is high The problem of rolling cracking easily occurs after 1.5%, and the present invention creatively combines the optimization of the content of alloying elements with the cladding structure. Cracking occurs, and at the same time, the composite layer effectively meets the requirements of the low melting point of the brazing material, which can reduce the brazing temperature by 20-30°C, greatly reduce the brazing energy consumption, improve the post-weld strength, and realize energy-saving and environmentally friendly green manufacturing of materials. On the other hand, the addition of Cu and Zn elements at the same time realizes the potential matching of each layer of the material, which is less prone to corrosion acceleration problems caused by high copper content and prolongs the service life.

Description

technical field [0001] The invention relates to a low-melting-point brazing layer anti-cracking multilayer aluminum alloy and a preparation method thereof, which are mainly used in the field of aluminum alloy low-melting brazing. Background technique [0002] Due to the large volume of the pipe materials such as the radiator Header, they absorb more heat during the welding process of the aluminum alloy material at 600 ° C, resulting in the corrosion of the header and the core material of the pipe material, resulting in a greatly reduced material strength and service life. If the brazing temperature decreases It can reduce heat absorption, reduce corrosion, enhance material strength and service life, so reducing the melting point of brazing materials is an urgent requirement for the heat transfer material industry. For many years in the heat transfer industry, the brazing temperature of aluminum alloy brazing materials has reached 550°C, which can be said to be the highest pu...

AI Technical Summary

Problems solved by technology

However, due to the addition of Cu, the introduction of Al into the solder 2 Cu intermetallic compound, the processability is very poor, in the process of heat transfer material rolling, if the copper content exceeds 1%, firstly, the ingot after casting is easy to crack, a large amount of Al 2 Cu aggregates together to create stress-forming crack sources, on the other hand, hard and brittle Al during rolling 2 Cu is subjected to rolling stress and is easy to form a crack source

Leading to cracking in rolling, this problem has occurred in small tests and many attempts

Images