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Tungsten inert gas (TIG) welding
Tungsten inert gas welding is a commonly used high quality welding process where precision is required. In tig welding an arc is formed between a non-consumable tungsten electrode and the metal being welded. Fluxing of the joint is achieved by the use of an inert gas shielded arc. Argon is used and it flows over the electrode preventing oxygen in the air contacting the weld joint. A high frequency generator provides a path for the welding current through the shielding gas. Because the welder must maintain a short arc length, great care and skill are required to prevent contact between the electrode and the work. A filler metal is added manually to the front end of the weld pool as it is required.
Typical applications include high quality welds in aluminium, stainless steel, and in areas such as air craft construction.
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