Sheilding gas for GTAW

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Can we use in GTAW process sheilding gas having mixture of 65% Argon, 5% CO2 & 30% Helium?If can use what is the advantages?If can not use, why?
Reply:well i use 100% argon for stainless steel..hot rolled..chrome moly..cold rolled steel..38% 64% argon helium mix on aluminum..whatever "floats your boat"...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:No, you cannot use any gas containing CO2 for GTAW. Attempting to use CO2 in GTAW will, among other things, contaminate the heck out of the tungsten.Aside from few highly experimental processes that use hydrogen (and promptly suffer from hydrogen enbrittlement) ONLY argon, helium, or a mix of those TWO should ever be used.Visit Tensaiteki.com
Reply:Hi,Thank you very much for your reply.RegardsSeeni
Reply:Hi,Thanks for your replyRegardsSeeni
Reply:Originally Posted by TensaitekiNo, you cannot use any gas containing CO2 for GTAW. Attempting to use CO2 in GTAW will, among other things, contaminate the heck out of the tungsten.Aside from few highly experimental processes that use hydrogen (and promptly suffer from hydrogen enbrittlement) ONLY argon, helium, or a mix of those TWO should ever be used.
Reply:A mix of 95% Argon and 5% Hydrogen is quite common for automated GTAW of precision stainless steel components.  The heat input for a given current is much higher than straight argon due to the "heat of vaporization" (something like that) associated with dissociation of H2 and subsequent recombination at the workpiece.  Hydrogen also has a "reducing" effect, meaning it combines with surface oxides, thus cleaning the metal, good for nickle alloys.  It is also reported that hydrogen constricts the arc.Hydrogen cannot be used with steels or aluminum.  Porosity is a problem with both, and cracking is an issue with steel.