Welds 22 gauge up to 3/16 inch in a single pass. Proven built-in wire feeder with quick-release drive roll lever. Built-in contactor eases use and is an excellent safety feature which makes wire electrically "cold" when not welding. Four output voltage settings with wire feed tracking provide quick and easy adjustment for different materials and thickness. Separate "purge" setting to purge gas line and set flow rate without wasting wire. Easy access to polarity changeover includes storage holes ...