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Dissimilar of Materials
- Thread starter aws2004
- Start date
This combination of dissimilar material needs a transition piece of P22 in between the carbon steel (P-No 1) and Grade 91 (P-No 15 E Group 1). I am assuming the maximum service temperature will be governed by the carbon steel pipe material.
I would recommend welding the A 106 to A 335 Grade P22 transition piece and weld using the GTAW root with SMAW fill ER80S B2/E8018 B2. Once this is completed and PWHT, if required, I would weld the SA 335 Grade P22 piece with a 5% Cr filler metal to the Grade 91 pipe material.
I would recommend welding the A 106 to A 335 Grade P22 transition piece and weld using the GTAW root with SMAW fill ER80S B2/E8018 B2. Once this is completed and PWHT, if required, I would weld the SA 335 Grade P22 piece with a 5% Cr filler metal to the Grade 91 pipe material.
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