IGBT inverter technology is adopted to achieve precise feedback control and ensure stable current output. Current slow rise function, reduce arcing impact, improve the safety of use. Pressure and water pressure sensors protect the cutting gun and reduce the risk of accidental damage to the cutting gun. The inverter control power supply is small in siza and light in weight, and is easy to be installed on the beam of the CNC cutting machine. Machine type setting, including are success signal, arc pressure signal, two-way gas supply control, are pressure output function, suitable for CNC, robot cutting. The LGK-120 welder excellent in industrial applications, whether in infrastructure, steel structures, pressure vessels, machining or equipment manufacturing, providing stable and efficient cutting and welding solutions.