[MW:28443] WELDING P11 WITH P91 STEEL

Dear Sirs,

I read several methods to join a P11 [1.25 Cr- 1/2 Mo] pipe to P91 [9Cr - 1 Mo] pipe, such as :

1. Weld using filler metal corresponding to corresponding to [2-1/4Cr - 1Mo] steel & post weld heat treat at appropriate temp..

2. Butter P91 with  filler corresponding to  [2-1/4Cr - 1Mo], post weld heat treat & weld with P11 & re-post weld heat treat it.

3. Use a P22 pup piece to join P11 with P91, etc. etc.....  

However, I wish to know, which is the most appropriate method taking into considerations the overall weld-integrity and high temperature strength of the weldment.

Please help to clarify my doubts.

THANKS,

DDN VERMA

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