Welding gases provide a shield around the welding arc to prevent oxygen, nitrogen and hydrogen (contained in the air around us) from affecting the quality of the weld.
With TIG welding, pure Argon gas will shield most materials, but there are some differences which are illustrated in the table below.
|TIG Welding – What Gas do I Use?|
|Sugested Gas Mixture||Material|
|Carbon Steel||Stainless Steel||Aluminium (Alum’m & Copper Alloys)|
|Argon (100%)||***||** (All)||**|
|Argon/Hydrogen (98/2%)||*** (Austenitic only)|
|Argon/Nitrogen (98/2%)||** (Duplex only)|
The Argon is connected to the TIG welder through a regulator. The regulator is a valve that screws into the top of the Argon bottle. It allows you to:
A regulator will often be supplied with one or two gauges. The first shows the bottle contents, the other will show the pressure of the Argon supplied to the TIG welder.
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