Characteristics of vacuum brazing

    Vacuum brazing has been widely used in the field of vacuum cryogenic technology, in aerospace, nuclear industry, and electronic devices. It is inseparable from its unique welding advantages.

    ①The working pressure range of vacuum brazing is 68~10-4Pa. In the vacuum atmosphere, there will be no oxidation, decarburization, and carbon increase, avoiding pollution, and the welded joints are clean, dense and high in strength.

    ②The brazing temperature is low, the overall heating is uniform, the thermal stress is small, and the post-welding deformation is small. It is especially suitable for the welding of precision parts and components.

    ③In a vacuum environment, the gas contained in the base metal and brazing filler metal is easily released, which improves the performance of the base metal.

    ④Vacuum brazing does not use flux, no pores and inclusions, and improves the corrosion resistance of the base metal. At the same time, there is no need to clean up welding slag, which improves working conditions and does not pollute the environment.

    ⑤Multiple welds can be welded at one time, which improves welding efficiency.

    ⑥It is especially suitable for welding metal and non-metal materials that are easily oxidized at high temperature. Such as the brazing of aluminum and aluminum alloys, titanium and titanium alloys, and the brazing of non-metals such as ceramics, graphite, glass, and diamond. It is also very suitable for the same or dissimilar brazing of stainless steel, high temperature alloys, zirconium, niobium, tungsten, molybdenum and other materials.

    In short, vacuum brazing has uniform heating, small deformation of the weldment, no flux, no cleaning after welding, high quality brazing products, and it can braze metals and alloys that are difficult to weld by other methods. It has been widely used in many fields.

    The disadvantage of vacuum brazing is that the assembly quality and tolerance requirements are higher than ordinary brazing, and it is not suitable to braze materials that are easy to evaporate in a vacuum environment.

(Huiputech)