[MW:3946] Overlay/cladding procedure

Hi ,

I have one query regarding above mentioned subject. Let me brief in general what actually happen in my project. My project is modification of clad column (installation of new nozzles) and associated piping. Existing cladding is SS 410S (Middle to bottom section) and SS 347 (top section). After referring to API 582 Appendix B table B-1, recommendation of filler selection for 

1. SS 410S is ER NiCr-3 for 1st and 2nd layer
2. SS 347 is ER 309Cb for 1st layer and ER 347 for 2nd layer.

I already instructed our contractor to qualified cladding procedure (GTAW process) based on ASME IX and API 582 but unfortunately our contractor refused to do it and claim their existing Cladding procedure SS 309L qualify to clad SS 410S and SS 347. 

I don't know what to do now because I'm not well known about ASME IX. Please help and advice me. You cooperation is highly appreciated

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