Tungsten inert gas (TIG) welding involves heating the metal about to be welded with a non-consumable tungsten electrode. As this arc welding process occurs, gas shields the weld material from oxygen in the air that could contaminate your work.Get the best deals on AC DC TIG Welders at Eastwood. Do better welding in your shop or home garage while paying less by using an aluminum TIG Welder from Eastwood.