... Inverter frequency up to 100KHz, conversion rate of 85%, no-load loss, using non-adjustable, easy to use, easy to carry, reliable ... welding performance: dynamic characteristics of a good, little spatter, arc stability, weld pool easy to control, weld appearance, 200B ... system: over-voltage, overheating, over-current automatic protection to ensure welding safety ITEMMMA-250MMA-315Power voltage(V)(3PH ...