TIG welding (Tungsten Inert Gas) is an arc welding process in which metals are fused at high temperatures using a non-consumable tungsten electrode. Typically, no filler metal is added—the base metals are melted together to form a clean, precise weld. The arc is shielded by a continuous flow of argon or another inert gas, which stabilizes the arc and helps control weld temperature for superior accuracy. When additional strength or structural support is needed, a compatible filler metal can be introduced to reinforce the weld.