The Arcair-Matic N6000 uses either constant potential (Voltage) or constant current (amperage) welding supplies. Groove depth and width are per-set by the operator. An electronic feedback loop senses arc voltage (or current) variations and instantly adjusts the electrode feed/retract mechanism accordingly. The N6000 will accommodate all electrode sizes from 7.9mm (5/16”) to 19.1mm (3/4”).