Brazing features the joint has a smooth surface, good air tightness, stable shape and size, as well as the welding part is not large microstructure and performance changes, welding parts can not be connected to the same or different metal and some non-metal.During brazing, the entire workpiece can be heated to weld more than one weld at a time, thus increasing productivity.However, brazing joint strength is relatively low.Lap joints are mainly used to increase the strength of joints by increasing the lap length.In addition, brazing requires a relatively high level of preparation.At present, brazing has been widely used in machinery, electrical, instrumentation, radio and other departments.

Brazing is characterized by solder melt, but the weld does not melt.In order to firmly connect the brazing parts and enhance the adhesion of the brazing filler metal, the brazing filler metal shall be used in the brazing process to remove the oxide on the brazing filler metal and the surface of the welding part.Hard solders (such as copper, silver, aluminum, nickel, etc.), with a high strength, can be used to connect load-bearing parts, and is widely used, such as carbide and bicycle frames.Compared to filler metals such as tin, lead, bismuth, etc., the welding strength is low, mainly used for the requirements in the load-bearing but good sealing performance of welding parts, such as containers, instrument parts.Brazing is widely used in machinery, motor, instrument and radio manufacturing industries.

Brazing USES alloys with a melting point lower than the base metal as filler.When heated, the filler melts and is filled by wetting and capillary action and remains in the joint gap, while the base metal is solid and brazing is formed by diffusion between the liquid filler and the solid base metal.Brazing has little effect on the physical and chemical properties of the base material, and the welding stress and deformation are small. The dissimilar metals with big difference in weldability can be welded, and multiple welds can be completed at the same time. The joint appearance is beautiful and neat, the equipment is simple, and the production investment is small.However, the strength of brazed joint is relatively low and the heat resistance is poor.

Silver-Copper-Zinc-Cadmium Brazing Alloy