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.
Brigg (/'brɪg/) is a small market town in North Lincolnshire, England, with a population of 5,076 in 2,213 households (2001 UK census), the population increasing to 5,626 at the 2011 census. The town lies at the junction of the River Ancholme and east–west transport routes across northern Lincolnshire. As a formerly important local centre, the town's full name of Glanford Brigg is reflected in the surrounding area and local government district of the same name. The town's urban area includes the neighbouring hamlet of Scawby Brook.