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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.

​Belper is a town and civil parish in the local government district of Amber Valley in Derbyshire, England, located about 7 miles (11 km) north of Derby on the River Derwent. As well as Belper itself, the parish also includes the village of Milford and the hamlets of Bargate, Blackbrook and Makeney. As of the 2011 Census, the parish had a population of 21,823. Originally a centre for the nail-making industry since Medieval times, Belper expanded during the early Industrial Revolution to become one of the first mill towns with the establishment of several textile mills; as such, it forms part of the Derwent Valley Mills World Heritage Site.

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