I have a job having MDMT - 29 Deg C with Inconel 6625 corrosion restistant overlay on it. There is a cover plate which is 120 mm thick and needs to be overlayed (4 mm)

I am using FCAW process for overlay with ER NiCrMo3 Filler.


As per ASME Sec VIII Div 1, Base material for cover flange (which is 120 mm thick) requires to be impact tested at MDMT. We have complied with this requirement during procurement of material.

ASME Sec VIII Div 1, UCS 67 requires welding procedures used for welding above material to be impact tested.

My doubt is since carrying out corrosion resistant overlay on surface of material. Does my procedure still require to be impact tested ?. ASME Sec IX essential variables for overlay is silent on Impact requirement. ASME Sec VIII Div 1 UCS 67 is general rule for impact testing requirments

I am not getting relevant reference in Code in either of direction, required or not required.

Can any one guide me for above. If possible with reference document where i can review details.

Thanks in advance.

CVN impact is not required for CRO qualifications

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Raghuram