[MW:5416] welding A335 P91 with Carbon steel

Sirs,   I have a question about welding dissimilar material:   One Metal:          A335 P91 ----------------------------------        PNumber 15E Second Metal      MSS SP75 WPHY-70  ---------------        Snumber 1   Wall thickness                                                              36.53 mm   Which ones are the best  FILLER METAL for   GTAW?   Which ones are the best  FILLER METAL for   SMAW?     Is it necessary PWHT?   Please give a tips.   Best Regards   Mauricio

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