Brazing can be divided into two categories, soft brazing and brazing

A welding method in which a metal material with a lower melting point than the base material is used as the solder, and the liquid solder is used to wet the base material and fill the gap between the workpiece interface and make it diffuse with the base material. The brazing deformation is small, and the joints are smooth and beautiful. It is suitable for welding precise, complex components and components composed of different materials, such as honeycomb structural plates, turbine blades, cemented carbide tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil stains and excessively thick oxide film to ensure the interface assembly gap. The gap is generally required to be between 0.01 and 0.1 mm. According to the different welding temperature, brazing can be divided into two categories. Welding heating temperature lower than 450 ℃ is called soft soldering, higher than 450 ℃ called brazing.