... carbon arc gouging.Advantage:1. Soft-switching, IGBT Inverter, DC manual arc welders2. lightness, high quality and energy-saving 3. Iso ... like acid, alkali, cellulose, etc.MMA soft-switching IGBT inverter manual arc weldersTypeMMA-315MMA-400MMA-500MMA-630Rated Input Voltage/Frequency3ph ~380V ...