The main technological parameters of the brazing process are the brazing temperature and holding time.

 The main technological parameters of the brazing process are the brazing temperature and holding time. The brazing temperature is usually selected to be 25-60℃ higher than the liquidus temperature of the solder to ensure that the solder can fill the gap. The brazing holding time depends on the size of the workpiece and the intensity of the interaction between the brazing filler metal and the base metal. The holding time of large parts should be longer to ensure uniform heating. If the brazing filler metal has a strong effect on the base material, the heat preservation time should be short. Generally speaking, a certain holding time is necessary to promote the mutual diffusion of the solder and the base metal to form a firm bond. But too long holding time will lead to defects such as melting. There are many common brazing process methods, which are mainly distinguished by the equipment used and the working principle. If distinguished by heat source, there are infrared, electron beam, laser, plasma, glow discharge brazing, etc.; according to the working process, there are contact reaction brazing and diffusion brazing. Contact reaction brazing utilizes the reaction of the brazing filler metal and the base metal to generate a liquid phase to fill the joint gap. Diffusion brazing is to increase the heat preservation and diffusion time, so that the weld and the base metal are fully homogenized, so as to obtain a joint with the same performance as the base metal.