Method for low temperature brazing aluminium alloy to obtain brazed joint with high temperature use performance

Abstract

The invention relates to a method for brazing an aluminum alloy at a low temperature to obtain a welded joint with high-temperature performance, and the invention relates to a welding method. It is to solve the large deformation after welding in the existing method, and it is difficult to realize the welding of complex structural parts. In the brazing method, the residual flux after welding has a corrosive effect on the workpiece, high operating cost, long welding cycle and the strength of the soldering joint. Low, poor performance of welded joints at high temperatures. The method for obtaining welded joints with high-temperature serviceability by low-temperature brazing of aluminum alloys is realized through the following steps: 1. Putting brazing filler metal into the weld gap or the gap port; 2. Preliminary brazing; 3. Ultrasonic treatment. When the aluminum alloy is brazed by the method of the invention, there is no corrosion effect on the workpiece, and the method of the invention has short welding cycle, low welding temperature and low operation cost. The method of the invention improves the strength of the welded joint, and improves the performance of welding at high temperature.

Description

technical field

[0001] The invention relates to a welding method. Background technique

[0002] Aluminum alloy has the characteristics of low density, high strength and corrosion resistance, so it is widely used in automobiles, high-speed railway vehicles, and aerospace industries. In particular, the price of copper metal materials is soaring. Many traditional copper alloy structural parts have been replaced by aluminum alloys, which makes the application range of aluminum alloys wider than before. As a result, more and more attention is paid to the welding technology of aluminum alloys. The requirements are also more stringent. For aluminum alloy structural parts, ensuring a small amount of denaturation is the key point, so people expect that the lower the welding temperature, the better, TIG welding, MIG welding, laser welding, electron beam welding, diffusion welding and instantaneous liquid phase welding methods There are problems of large deformation after welding and...