[MW:22184] SUB: WPS HF OVERLAY WITH ITERMEDIATE LAYER OF 307Si

Dear Experts,

I have a typical problem. I request your expert guidance.

I have a requirement to do a HF overlay with stellite 6 on P1 base material using an intermediate (buffer) layer of SS 307Si.

My question is:

1. In the WPS (per ASME SEC IX) do I need to do a separate PQR qualification test for intermediate layer as CR Overlay?
2. Subsequently when I make HF overlay on the intermediate layer, which one is considered as base material (P1 material or intermediate metal)?

Thanks,

MANIVANNAN.P

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