Gas Tungsten Arc Welding (GTAW) is frequently referred to as TIG welding. This is a commonly used high quality welding process. TIG welding has become a popular choice of welding process when high quality, precision welding is required.

In TIG welding an arc is formed between a non-consumable tungsten electrode and the component being welded. Gas is fed through the torch to shield the electrode and molten weld pool. If filler wire/rod is used, it is added to the weld pool.

Typical shielding gases used are argon, argon & hydrogen and argon and helium. Helium is generally added to increase the heat input (increasing welding speed or weld penetration). Hydrogen will result in cleaner looking welds and also increase heat input. However hydrogen may promote porosity or hydrogen cracking.

As with all processes there are advantages and disadvantages.

Advantages:

• Superior quality welds
• Welds can be made with or without filler metal
• Precise control of welding variables (heat)
• Low cost in comparison with processes such as electron beam and laser welding

Disadvantages:

• Requires greater welder dexterity than MIG or stick welding
• Lower deposition rates

We specialise in precision TIG welding of nickel alloys (including Hastelloy, Inconel and Monel), stainless steel, aluminium alloys and most of the heat treatable steels. Fusion welding of thin sections from 0.1mm upwards and fusion or filler welding of thick sections enables us to process a wide range of product applications.

Many of our operators are coded to the latest European Standards.