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Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode are protected from oxidation or other atmospheric contamination by an inert shielding gas (argon or helium). A filler metal is normally used, though some welds, known as autogenous welds, or fusion welds do not require it. When helium is used, this is known as heliarc welding. A constant-current welding power supply produces electrical energy, which is conducted across the arc through a column of highly ionized gas and metal vapors known as a plasma. GTAW is most commonly used to weld thin sections of stainless steel and non-ferrous metals such as aluminum, magnesium, and copper alloys. The process grants the operator greater control over the weld than competing processes such as shielded metal arc welding and gas metal arc welding, allowing for stronger, higher quality welds. However, GTAW is comparatively more complex and difficult to master, and furthermore, it is significantly slower than most other welding techniques. A related process, plasma arc welding, uses a slightly different welding torch to create a more focused welding arc and as a result is often automated.
Huntingdon is a market town in Cambridgeshire, England, chartered by King John in 1205. Having been the county town of historic Huntingdonshire, it is now the seat of the Huntingdonshire District Council. It is well known as the birthplace of Oliver Cromwell, who was born there in 1599 and its Member of Parliament (MP) for the town in the 17th century. The former Conservative Prime Minister (1990–1997) John Major served as the MP for Huntingdon from 1979 until his retirement in 2001.