TIG stands for Tungsten Inert Gas. It is a welding process that uses a non-consumable tungsten electrode to deliver the current to the welding arc. An inert gas, typically argon, protects and cools the tungsten and weld puddle. TIG welding is highly versatile and is used to join a wide range of small and thin materials. It is similar to oxy-acetylene welding in that a filler material is used for build-up or reinforcement. TIG welding is commonly used for aluminum and 4130 chrome-moly steel in race car fabrication. TIG welding produces welds that are precise, strong, and clean.