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Ditto on that Js55!
Who is this person that's a metallurgist? Could you please invite him on to the forum so he could explain, no wait - justify his decisions in welding with Ar/He mix on carbon steel piping with those diameters & wall thicknesses?
It would be very interesting Rebel 74, Js55 to read what this individual has to say in his justification for using an Ar/He mix as a shielding gas for carbon steel... I've used it on thick aluminum, and some thick 316L stainless pipe fittings but come on!!! Carbon Steel???
For what it's worth Rebel74, I think this person needs to go back to his reference books that cover "Welding Metallurgy" as opposed to what he's referring to as process metallurgy? or basically steelmaking if that's what this person is thinking??? After all, a Metallurgist does'nt always have the same background that a welding engineer would have and sadly to say, most Material Scientist types these days only get rudimentary training in "Welding Metallurgy" if any! They only go over the basics when it comes to joining metals.
I would suggest to get the welding engineer involved or someone else that has more expertise in welding than that metallurgist because, this person really sounds confused and I'm not a metallurgist!!!
Good luck in your struggle Rebel74, and see if you can "cajole" this person into explaining their decision for using the Ar/He mix for carbon steel GTAW here in the forum.
Respectfully,
Henry