ASME SA335 F11 (P4) material was welded using 150'F Preheat as per their WPS. However, Code of Construction being ASME B31.3 states a minimum preheat temperature of 250'F shall be applied. There are 700 socket welds completed like this. I recommended Heat Treatment for the welds and Hardness testing to prove the material won't be brittle, but Client isn't buying it. What other options can be done in regards to testing to ensure the integrity of these welds? They are 1-1/4" STD SA335 pipe into Couplings. Are there any exemptions from these minimum preheat temperatures in ASME B31.3, Metallurgists or Wielding Engineers out there, please advise?
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