My question is regarding the PWHT requirements for above vessels,
1.Does the shell to nozzle weld edges to be buttered by Er NiCrMo-3 before PWHT and groove welding by Er NiCrMo-3 after PWHT?
YES.
or
2.Or a PQR of dissimilar joint P1 to P43 with PWHT (of P1 requirements) can be used directly?
P43PWHT NOT RECCOMENDED.HENCE GO WITH OPTION ABOVE.
UNF 56 : Does not address such dissimilar joint
UNF-56 POSTWELD HEAT TREATMENT
(a) Postweld heat treatment of nonferrous materials is not normally necessary nor desirable.
Kindly share your experience/recommendations.
Thanks.
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