Capacitor energy storage welding machine is mainly composed of power rectifier part, charge and discharge conversion circuit, welding transformer, welding circuit, electrode pressure mechanism, etc. The principle of capacitor energy storage welding is to use the energy slowly stored in the capacitor from the power grid. In a short period of time, the metal is heated and melted by discharging the welded workpiece through the resistance welding transformer. Compared with other welding methods such as AC machines, the instantaneous power drawn from the power grid is low, the load of each phase is balanced, the power factor is high, and it can provide concentrated energy to the welding zone, and can obtain weldments with good surface quality and small deformation. Some hard-to-weld non-ferrous metals with good thermal and electrical conductivity. Suitable for welding aluminum, copper silver, nickel metal and alloy materials. This welding method has been widely used in industrial production, such as hardware, household appliances, electronics, metal utensils and other industries.