Welds 24 gauge - 3/16 in. (0.8-4.8mm) mild steel. Uses 120V power. Uses a breakthrough control that automatically sets your welder to the proper parameters. Auto-Set offers all-in-one MIG minus the hassle of finding parameters. Simply set the wire diameter, the material thickness, and start welding! Automatically detects when a MIG gun or spool gun is connected eliminating the need for a switch.