Welds 20 gauge up to 3/16 inch steel with flux cored wire. Proven built-in wire feeder with quick-release drive roll tension 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 speed tracking provide quick and easy adjustment for different materials and thickness. Separate "fan only" or "purge" setting to purge gas line and set flow rate without wasting wire Dual groove drive rolls make it easy to switch between .023/.025 in. (0.6mm) and .030 - .035 in. (0.6 - 0.9 mm) wire.Self-resetting thermal overload and motor protection.