medium frequency inverter DC spot welder Adopting the latest generation of medium frequency inverter welding controller, it has many advantages such as short power-on time, high thermal efficiency, three-phase DC output, high working frequency and small transformer loss. It is suitable for welding carbon steel, stainless steel, galvanized, copper, aluminum, aluminum alloy, iron, nickel, high strength steel, hot forming steel and other metal materials. Medium frequency spot welding machine can be widely used in auto parts, auto body, aerospace, high and low voltage electrical, household appliances, elevator, hardware and furniture, new energy and other industries.