Brazing of heat energy can be a chemical reaction, or indirect heat. It is the use of lower melting point than the melting point of the welded materials for low-metal brazing, heated to melt the solder, the solder materials by capillary action into the joint space within the contact surface, wetting the surface of the metal being welded, the liquid and interdiffusion between the solid phase to form brazed joints. Therefore, the brazing is a solid phase and liquid phase welding method. Brazing heating temperature is lower, the base metal does not melt, but also without pressure. But before welding must take certain measures to clear the Welding Wire  surface of oil, dust, oxide film. This is a good wettability to the workpiece, an important guarantee to ensure joint quality. Solder liquidus above 450 ℃ and the humidity is lower than the melting point of base metal, known as the brazing; less than 450 ℃, called soldering. According to the heat source or heating methods can be divided into different brazing: flame brazing, induction brazing, furnace brazing, dip brazing, resistance brazing, etc. Brazing temperature is relatively low due to heating, so the less impact the workpiece material properties, welding stress and deformation is also small pieces. However, the strength of brazed joints is generally low, heat resistance is poor. Brazing can be used for welding carbon steel, stainless steel, high temperature alloys, aluminum, copper and other metal materials, you can connect dissimilar metals, metal and nonmetal. Suitable for Tungsten Electrode or at room temperature under load is not the work of connectors for precision, miniature and complex multi-brazing seam welding is especially useful.