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what are the typical inerting gases for the GTAW process? is nitrogen applicable for this?

typically your garden variety gas is argon for cs,ss,alum.,etc.helium burns a little hotter than argon but it is more expensive we have used nitrogen as backing gas only for chrome moly pipe joints with alot of success

I think you mean inert gases, not inerting. For Tig, I use Argon for everything...it's truely an inert gas, as opposed to CO2 which is a reactive gas and can pass carbon into a weld.

Argon is a good, all 'round gas. Not cheap, but it can be used for many processes. I keep a bottle hooked up to my tig, and one for the spoolgun on my mig unit. I also use a CO2/argon mix for all my other mig welding, as I get better wet-out. CO2 will give you better penetration, but more spatter. I always use Argon as a backing gas for Al, stainless, titanium, etc. It will help assure a sound weld. If you weld to make money, stick with argon, write it off later.

I'll use an argon/helium mix for Tig welding aluminum using 250amps or over, because the helium will carry a bit more current than argon, thus more heat to the joint. But for most situations, I find 100% Argon is fine. There is a guy on youtube, thought I have no affiliation with him, who has a boatload of great videos with some great information. Welding tips and tricks. Good stuff. But pick up some AWS pubs, and look into the learning resources both Miller and Lincoln have online...you will find a wealth of information that will help you make the right choices for your situation.

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