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An electric arc between a non-consumable tungsten electrode and the workpiece provides the heat needed for the welding operation. The tungsten electrode is not melted and any filler metal needed to build up the weld profile is added separately. The molten metal in the weld pool, the tip of the filler wire and the hot electrode are protected from atmospheric contamination by a shield of inert gas.

Usually the gas is argon, but helium by itself, or mixed with argon, may be used for special applications. Argon-hydrogen mixtures can be used for austenitic stainless steel.

See our TIG weld process gases in action.

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Ask the Expert

"I always use pure argon for TIG welding as it is versatile, what would you recommend to still give me versatility?"
Alumaxx® Plus gives superior results with aluminium, its alloys and carbon steel; and Inomaxx® TIG is our best-in-class gas for austenitic stainless steel.

See the Benefits of Our Linx® Gases Range

Whatever you’re welding, Air Products’ innovative range of welding gases will give you superior results. Formulated to boost output through a unique combination of weldability, weld quality and higher welding speeds, you’ll achieve more with fewer rejects.
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Air Products’ Gastrak® Service

Save money, increase productivity and improve quality. Whether you use single cylinders or have gases piped, the Gastrak® service can help.

  • Reduce costs: By eliminating pre-weld surge and excessive gas flow rates you will use less gas.
  • Improve quality: Consistent use of the optimum gas flow rate improves weld quality and reduces rejects.
  • Easy installation: Gastrak® equipment can be integrated into an existing or new gas pipeline, or can be used with traditional or Integra® cylinders.

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