Vacuum brazing technology can be rapidly developed and applied, mainly because it has a series of advantages compared with other brazing methods.
1. In the process of vacuum brazing, the workpiece to be brazed is under vacuum conditions (10-4-67.5Pa range), and there will be no oxidation, carbonization, decarburization and pollution deterioration. The cleanliness of the welded joints is good, and the strength higher.
2. When brazing, the brazing temperature is lower than the melting point of the base metal, which has little influence on the base material, the whole part is heated evenly, the thermal stress is small, and the deformation degree can be controlled to a minimum, which is especially suitable for the brazing of precision products.
3. The low pressure around the base metal and the brazing filler metal can eliminate the volatile gas and impurities released by the metal at the brazing temperature, which can improve the performance of the base metal.
4. Since there is no flux, there will be no defects such as pores and inclusions, which improves the corrosion resistance of the base metal, avoids pollution, and saves the process of removing residual flux after brazing, saving time and improving working conditions. No pollution to the environment.
5. The heat treatment process of the workpiece can be completed at the same time in the brazing process engineering. By selecting appropriate welding process parameters, brazing can also be arranged as the final process, and a brazed joint with performance that meets the design requirements can be obtained.
6. It can braze multiple adjacent brazing seams at one time, or braze multiple components in the same furnace, with high brazing efficiency.
7. There are many kinds of metals that can be brazed, especially suitable for brazing aluminum and aluminum alloys, titanium and titanium alloys, stainless steel, high-temperature alloys, etc. Brazing connection, vacuum brazing is also suitable for composite materials, ceramics, graphite, glass, diamond and other materials.
8. Broaden the way of product design. Parts with narrow grooves, extremely small transition tables, blind holes, closed containers, and parts with complex shapes can be brazed without considering the problems of corrosion, cleaning, and damage caused by fluxes.
