MMA series inverter arc welding machine Feature: Adopting advanced inverter technology and excellent components and parts, high efficiency, small in size and light in weight.Compared with traditional welding machine, it' s small-wastage, high conversion rate, energy-saving.Protection equipment are set internaly to prevent over heat, over current, lack of voltage. MOSFET OR IGBT is selectable. Maximum current is 630A. Welding thickness could up to 80mm. Apply: stainless steel, carbon steel, mild steel, copper, etc. Optional spare parts: electrode holder, earth clamp, connector, protective mask.