1) Copper-zinc solder is mainly used for welding pure copper, brass and steel. It can be used for gas flame welding, high frequency induction brazing, dipping brazing, etc. When copper-zinc brazing filler metal is used, zinc is prone to intense evaporation, resulting in deterioration of joint performance and welder poisoning. When brazing, brazing fluxes should be used together. Only when the filler metal is applied in the form of particles or pastes or coated on the filler metal can a good filler metal be obtained.

2) Copper-phosphorus solder is based on the ternary alloy of Cu-Ag-P. It has good diffusivity and can braze pure copper and brass well. Because the phosphorus in the brazing filler metal can reduce the oxide of copper, no flux is needed for brazing pure copper, but for brazing copper alloy, flux should be used in order to obtain high quality brazing seam. Copper-phosphorus brazing filler metal can not be used for brazing steel and workpieces subjected to bending, impact and vibration loads. The addition of silver into copper-phosphorus brazing filler metal will greatly improve wettability, enhance the strength and corrosion resistance of brazing seam, reduce brittleness, reduce brazing temperature and replace silver-based filler metal containing more silver. The corrosion resistance of copper-phosphorus joints is similar to that of copper, but exposure to sulfur-containing gases should be avoided. In addition, copper-phosphorus alloys contain a variety of composition combinations with different solid and liquidus ranges. The melting point of copper-phosphorus alloys is relatively wide. If heated slowly, there will be segregation tendency.