What is TIG welding
TIG (Tungsten Inert Gas), known in Europe as WIG (Wolfram-Inertgas) or formally as GTAW (Gas Tungsten Arc Welding), uses a non-consumable tungsten electrode in a shielding atmosphere of inert gas — most commonly argon, sometimes helium or their mixtures. The weld is formed by melting the base material with an electric arc between the tip of the tungsten electrode and the workpiece; filler metal (wire) is added manually with the other hand.
History — where it all started
TIG was developed in the late 1930s in the USA for welding magnesium and aluminium structures in the aviation industry — the patent was filed in 1942 by Russell Meredith of Northrop Aircraft. World War II rapidly accelerated this technology (B-29 Superfortress, P-38 Lightning). After the war it spread quickly to chemical, food, nuclear and sanitary industries — anywhere absolute weld cleanliness and aesthetics are required.
Why TIG produces the most beautiful welds
During TIG welding the welder controls 4 independent things at once: current (often pulsed), torch trajectory, wire feed and gas flow. No other process gives such fine thermal control — you can lay needle-thin welds on 0.5 mm foil but also on robust pressure vessels. The classic „fish scales / stacked dimes" aesthetic proves the welder knows their craft: each scale segment is one controlled current pulse.
Did you know?
▸ Argon is standard for stainless; aluminium uses argon with pulsed AC sinusoidal current to break the oxide layer. ▸ Tungsten melts at 3422 °C — that's why it doesn't melt, it only evaporates. ▸ TIG is the cheapest in terms of consumables but the most expensive in terms of time — so it's used where MAG/MIG cannot (sanitary, vacuum, nuclear). ▸ The thinnest welds ever made by TIG measured 0.025 mm (the width of a human hair) — in nuclear engineering.