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I have the unfortunate job of field repairing equipment that involves 302/304 threaded fasteners that were originally GTAW welded to a 410 base plate (the base plate was originally heat treated to HRC35-40). The attached fasteners need to be removed and replaced.
All guidance I have seen so far indicates that I should preheat the 410 and then stress relieve after welding - neither will be practical or possible in my present circumstance.
I am tentatively selecting a 309L filler as my calculations show a resulting FN of ~10, not bad (I think). This is based on WRC-92 and Dr Kotecki calculations with the assumption of 15% dilution with each base material. Same calculation with 310 welding rod shows an FN off the chart so I assume this indicates a fully austenitic weld will result(not good, I think).
There is no governing welding code for this job, so a full blown procedure qualification is not required.
Any advice/comment/criticism from the board is invited please.
Thank you.
All guidance I have seen so far indicates that I should preheat the 410 and then stress relieve after welding - neither will be practical or possible in my present circumstance.
I am tentatively selecting a 309L filler as my calculations show a resulting FN of ~10, not bad (I think). This is based on WRC-92 and Dr Kotecki calculations with the assumption of 15% dilution with each base material. Same calculation with 310 welding rod shows an FN off the chart so I assume this indicates a fully austenitic weld will result(not good, I think).
There is no governing welding code for this job, so a full blown procedure qualification is not required.
Any advice/comment/criticism from the board is invited please.
Thank you.