Hobart 500551 EZ-TIG 165i AC/DC TIG Welder 230V Easy-to-Use Interface; All you need to do is power it up, select your material, and set the material thickness range Fan-On-Demand feature allows the fan to run only when needed, reducing dust/debris pulled into the unit Welds 22 ga up to 3/16 in. both AC (aluminum) and DC HF start to allow for a non-contact arc start to eliminate tungsten and material contamination Infinite Amperage Control provides broader operating range with finer control