TIG
Tungsten inert Gas (TIG) is frequently referred to as GTAW (Gas Tungsten Arc Welding). TIG welding is a commonly used for high quality welding process. TIG has become a popular choice of welding processes when high quality, precision welding is required.
In TIG process an arc is formed between a non consumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool. If filler wire is used, it is added to the weld pool separately.
TIG Welding Benefits
- Good quality welds
- Free of Spatter
- Welds can be made with or without filler metal
- Precise control of welding variables (heat)
- Low distortion
Shielding Gases
- Argon
- Mix Argon Hydrogen
- Mix Argon Helium
The purpose of Helium is generally added to increase heat input (increase 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.
GTAW Welding Limitations
- Lower deposition rates.
- Requires greater welder dexterity than MIG or SMAW welding
- Costly compare with SMAW
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