This stick welder features a 60% duty cycle for quick and easy welds. Digital Control: The aluminum welder uses an advanced IGBT inverter design with automatic overheat and over current welding protection. Aluminum TIG welder can weld up to 1/4" aluminum and 3/8" mild steel and is capable of welding 7018, 6013,6011,6010. Energy Efficient: The aluminum welder incorporates 2T/4T modes and HF Arc Start. 4T is useful if you have a long weld to do, as it saves your time.Non-contact arc initiation in TIG welders reduces tungsten and material consumption. Easy to Use: Whether your a novice, or a professional worker, this machine is an all round great welding machine. Both HF start hand torch control and precise foot pedal welding heat control. 200A AC/DC TIG welder can weld aluminum, stainless/carbon steel, copper and other color metal. Full arc control, pulse, Ac. Anything you could as for in a TIG welder this thing does very well.