Xionggu D7-500 (N) Pipe inverter welder is a semi-automatic multi-function welding machine. the three-phase 380V AC power from the grid is rectified and filtered, and then supplied to the IGBT inverter to be inverted into 20kHz medium-frequency AC power. After voltage reduction and rectification and filtering, the DC power supply that can meet the welding needs is obtained; The wire feeding device sends the welding wire out of the contact tip, and generates an arc to start welding after short circuit with the workpiece.