Support long welding rods below 6.0 and carbon rods below 15mm. The adaptive extension line with the corresponding national standard line extension supports longer than 100 meters, can be welded normally; 6%--12% energy saving than the traditional inverter welding machine. Full-bridge IGBT inverter scheme for higher work efficiency, high power factor; strong ability to resist power grid fluctuations, suitable for power supply of generators above 42KW;