... digital display of preset and actual welding current and voltage values.2- IGBT inverter soft-switching technology,high frequency, high ... fall position welding.7- Be the ideal power for carbon arc gouging.Advantage:1. Soft-switching, IGBT Inverter, DC manual ... acid, alkali, cellulose, etc.MMA soft-switching IGBT inverter manual arc weldersTypeMMA-315MMA-400MMA-500MMA-630Rated Input Voltage/ ...