American Welding Society Forum
Hi everyone.My Name is Magno Rodrigues, I'm new here. I would like your help to solve a question.
As we know, some people use nitrogen instead of argon as a backing gas on stainless steel 304, 316 welding
In case of 900 series, 904l specifically, the WPS order to use a 100% purity argon.
I have read some articles, but not about the situation above.
My question is: Can be used nitrogen istead of argon to purge 904l Stainless Steel? If not, Why?
To answer your question directly, if your procedures have been qualified to ASME Sec. IX using argon then the answer is no. You would have to requalify using Nitrogen backing. From a welding standpoint, since 904L is a true austenitic stainless steel with low carbon content and has a full austenite grain structure in the annealed product form, using nitrogen would be acceptable with client concurrence. N2 could help improve corrosion resistance and pitting resistance. There are a number of papers on this. I think you could find them on TWI web site.
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