Advanced Mosfet inverter technology, strong resistance to high voltage and high temperature With O.C & O.H protection, hot start Molten tungsten electrode non-contact HF arc start method, which holds burning through the thin workspace With O.C & O.H protection, for long-term using Capable of weld stainless steel and other easy oxidated nonferrous metal and alloy steel, such as MIG, TIG or another alloy