Definition
An electric arc welding process in which the arc is produced between a non-consumable tungsten electrode and the workpiece, while an inert shielding gas (typically argon or helium) flows around the weld area to protect the molten metal from atmospheric contamination. Filler metal, when needed, is added separately by hand. Also known as Gas Tungsten Arc Welding (GTAW).
Plain English
A precise welding method that uses a tungsten tip to create the arc and a stream of inert gas to keep air away from the weld, producing very clean, high-quality joints. The welder feeds in a separate filler rod by hand if extra metal is needed.
Context Anchor
Seen in aircraft maintenance discussions about repairing or fabricating metal parts, especially where a clean, controlled weld is needed.
Derivation
The name describes the two key elements of the process: a tungsten electrode (which does not melt away during welding) and an inert gas shield (which does not react with the hot metal). Tungsten is used because it has the highest melting point of any metal, so it can sustain the arc without being consumed.
Why Pilots Care
Creates strong, clean, and corrosion-resistant joints required to maintain airframe structural integrity after repairs.
Intuition Check
Do not assume the tungsten electrode becomes the weld metal. In TIG welding, the tungsten mainly makes the arc; any added weld metal usually comes from a separate filler rod.
Example Sentence 1
The technician used TIG welding to repair a cracked aluminum fitting on the engine mount.
Example Sentence 2
TIG welding produced a smooth, high-strength bead on the stainless steel exhaust component.