TIG stands for Tungsten Inert gas. It uses an electrode separate from the filler material, the electrode is called tungsten. The inert gas we used is typically argon, or sometimes helium or a mixture. It works on a wider variety of metals than any other type of welding. It also produces the cleanest, strongest welds. Usually, there is no spark, no spatter, slag or smoke and fumes in the welding process.