Can WPS be qualified using base metals for clad material? 1

[razana74]

Hello All, I'm new in this forum and I need a bit of help.
A vessel fabricator is requesting to qualify their WPS for weld overlay of vessel wall (C-Mn Steel with 410S Clad) using just the base metal wihtout the cladding. Is this allowed by the code? Isn't the P Numbers different? Appreciate help. Thanks

 

[gr2vessels]

razana74,
Something is not quite clear in your post;- an established pressure vessels fabricator with experience in the field, has generated a WPS for welding stainless steel material on carbon steel material and want to qualify the WPS with a PQR for P1 welded to P1? Did you check their records on vessel fabrication? It might be their first...
Obviously, they need a WPS and a fully qualified PQR for the Stainless Steel weld overlay. Refer also to ASME SA 264.
However, if you refer to the closing seam of the shell or head to shell, you will probably remove the existing overlay from the vicinity of the seam and weld the joint as carbon steel only, do the NDT's and then cover the long / circ seam with weld overlay. That's a more likely scenario.
gr2vessels

 

[vesselfab]

They most likely want to use two (2) WPS one for the base metal and one for the overlay portion.

Perfectly acceptable, if that is the case.

 

[weldtek]

Unless the cladding is factored into the design for strength, (not just a corrosion allowance) in which case you must qualify a procedure on clad material.

 

[razana74]

Noted. Thank you all for the replies. They're very helpful and I'm definitely coming back to this forum for more knowledge sharing. Thanks again

 

[stanweld]

Seperate groove weld qualification on P1 to P1 material and 410 to 410 material does not satisfy ASME IX & ASME VIII requirements.

Seperate groove weld qualification on P1 to P1 materials and a corrosion resistant overlay qualification comply with ASME IX and ASME VIII.

Single groove weld qualification on 410 clad P1-material will also satisfy ASME IX and ASME VIII requirements

 

[gr2vessels]

Interesting statements stanweld, can you please elaborate a bit on them? The topic was the welding specification for a 410 cladded P1 material to be qualified with one PQR, qualified for P1 welding..
cheers,
gr2vessels

 

[stanweld]

gr2vessels:
While I may have misinterpretted the original query, I believe that my statements are compliant with UCL-40, and QW-217.