I have a special assignment coming up and the requirement calls for helium instead of argon for my shielding gas. Now I've used helium for many years to DCEN aluminum and even been lazy enough to not change over bottles to weld some steel with the helium but this new task is something out of the ordinary. I've never seen a welding requirement for helium on stainless. This is at the NASA and you'd hope that they would know what they needed. The engineer claims that argon would introduce a contamination to the system. Must be a helium system I'll be welding on.
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