... actual welding current and voltage values.2- IGBT inverter soft-switching technology,high frequency, high efficiency and low noise, ... protecting function, safe and reliable.4- Drive current and start current can be adjusted continuously, intensive arc drive force, ... types rods like acid, alkali, cellulose, etc.MMA soft-switching IGBT inverter manual arc weldersTypeMMA-315MMA-400MMA-500MMA-630Rated ...