TIG/MMA, or TIG only. Advanced IGBT inverter technology, energy-saving. Melted tungsten electrode, non-contact HF arc start method, which avoids burning through the thin workpiece. Portable, energy-saving, light-noise, and easy to carry. Gas after flow time can be matched between 1-10s, helping beautify the ending seam. With O.C&O.H protection, for long-term use. Capable of welding stainless steel and other easily oxidated nonferrous metal and alloy steel, such as MIG, TIG, or other alloy