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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.

​Wellingborough (/ˈwɛlɪŋbərə/ WEL-ing-bər-ə) is a large market town in the Wellingborough district of Northamptonshire, England, 11 miles (18 km) from Northampton on the north side of the River Nene.[3][4]

Originally named "Wendelingburgh" (the stronghold of Wændel's people),[5] the Anglo-Saxon settlement is mentioned in the Domesday Book as "Wendelburie". The town was granted a royal market charter in 1201 by King John.[6]

At the 2011 census, the town had a population of 49,128.[1] The Borough Council of Wellingborough has its offices in the town centre.[7] The town is twinned with Niort in France, and with Wittlich in Germany.

The town is predicted to grow by 30 per cent under the Milton Keynes South Midlands (MKSM) study, and the government has identified Wellingborough as one of several towns in Northamptonshire where growth in jobs and housing will be directed.[8] The area will see an addition of around 10,000 homes by 2031, mainly to the east of the town.[9] Wellingborough, along with Corby and Kettering together comprise the core of the North Northamptonshire growth area, coordinated by the North Northamptonshire Joint Planning and Delivery.[10] The town also has a growing commuter population as it is on the Midland Main Line railway, operated by East Midlands Railway, with trains to London St Pancras International taking under an hour, and an interchange with Eurostar services.[11]

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