Solder powder is also called flux-packed welding. The flux-covered welding can not only weld metal stranded wires with a cross-section of 3-240mm 2, but also metal bus bars with a cross-section of 1000mm 2. Welding powder can weld metal strands, bars, flat steel, metal plates, etc., and can be connected under appropriate welding conditions, such as welding of steel rails. Because the melting temperature of the solder material is higher than the melting point of copper (1082 degrees Celsius). Therefore, when the temperature rises abnormally due to a large fault current, the conductor itself will melt before the joint.
The solder powder uses the heat of chemical reaction of the metal compound as a heat source, and works directly or indirectly through superheated molten metal to form a certain shape and size in the cavity of a special graphite mold, which meets the needs of the project. The current exothermic welding has generally replaced previous mechanical connection methods between metals.
