Tig Welding TIG stands for tungsten inert gas and is technically called gas tungsten arc welding (GTAW). The process uses a non-consumable tungsten electrode that delivers the current to the welding arc. The tungsten and weld puddle are protected and cooled with an inert gas, typically argon. TIG welding is similar to oxy-acetylene welding in that you use a filler material for build-up or reinforcement. we use TIG welding for aluminum and 4130 chrome-moly steel. If you are going to weld either of these materials, you need a quality TIG welder. Miller offers products to accommodate anyone — from a home hobbyist to an advanced user. If you have ever welded with an oxy-acetylene torch, you can easily weld with a TIG machine. The TIG process uses an electric torch, and the welder hand feeds filler rod into the molten puddle. The ability to soft start and soft stop the heat makes the TIG process different from other types of electric welding. Some people like the accelerator pedal to control the heat if they are working on a bench and others like fingertip remotes on the torch if they are working in areas that are considered out of position. The remote adjusts the heat while you are welding. Before you use a TIG unit, you should be familiar with the parts of the welder and the function of each part. The work lead, often referred to as a ground cable with a clamp, must be attached to the workpiece or to the metal surface that the workpiece is on. The welding lead will have an electric TIG torch on the end. Along with the cable is a small line that carries the argon gas. The inert gas performs like the flux coating on a stick electrode in that it protects the weld from airborne contaminants. You will need a gas bottle and a regulator. DO NOT use the same gas that you would use with a MIG welder.