Can't find this quarry but here is the answer:-
According to UG-40
"When 2 dissimillar P no. metals are welded, like in this case-
PWHT will be done as per UCS66 for the base metal, if PWHT temp. for other material is more then PWHT will be done with the same."
Regards
Manpreet Singh
Welding Engineer
Spiecapag
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