Cold Repair Procedure Issue

[MrGezus]

I have a WPS/ for a GTAW 625 CRO to 4130 which is heat treated. Our testing lab's WPS for my cold repair, which references the 625-4130 CRO WPS, states that the repair is qualified to weld on:

WPS
Base Metal (QW-403)
Specification - Low alloy steels (including 4130, 8630, and F22)

PQR
Base Metal (QW-403)
Specification - Inconel-clad AISI 4130

DNV is telling me that this is incorrect because the original WPS is 4130 base material so the only base material that can be listed is 4130. His argument for only allowing 4130 as base material is QW-424. He was hard to understand but I assume he was talking about the table which states any unassigned metal to any other unassigned metal give you base metals qualified as the first unassigned metal to the second unassigned metal.

My lab is telling me that DNV is incorrect.
"This is neither an ASME or DNV requirement, but that of an individual. The repair procedure is intended to apply to any "Inconel-clad low alloy steel" as stated in the title. Consequently, I do not want to make this change, nor do I want to make a separate "DNV" version, especially since this is not a DNV requirement. If this individual wants this, please have him show me where this requirement exists other than in his mind."


Another lab is telling me that DNV is correct because the base material IS in fact 4130.


Yet another lab is telling me that DNV is incorrect because since it is a cold repair, and while repairing, the inconel is not cut down to the 4130 base material so the base material actually should be listed as Inconel on the WPS QW-403.


Does the inconel subsequently become the new base material and he has it listed incorrectly? I am at a loss. Any help would be greatly appreciated.

 

[metengr]

First you make no mention of the Code being used to qualify the WPS, from your post you mean ASME Section IX, for CRO qualification. There is misinformation when folks do not understand the code.

IF you are using ASME Section IX for qualification of CRO on 4130 base material, the 4130 base material is unassigned (no P-No), and as such, is limited to 4130 steel for base metal qualification. Until you can qualify base material using an assigned P-No, which affords a wider grouping of base material, you are stuck with qualification of the particular unassigned base material.

 

[metengr]

MrGezus;
After re-reading your post several times I suspect you are confusing what needs to be done and with what type of welding procedures. For weld repair of an existing clad material, you qualify a WPS for Inconel (P-No 43) to Inconel (P-No 43) weld build-up regardless of the substrate material because you are not welding to the substrate material directly. This is standard in the industry. The code even allows for wrought Inconel material to be used for this type of weld repair.

IF the weld repair so much as touches the 4130 base material, you are back to using a WPS that is qualified for CRO on 4130. What more do you need?

 

[MrGezus]

My apologies. It is ASME Section IX. I thought that it would not be an issue welding inconel on inconel. The weld would never touch the base material is it is almost always tiny spots picked up by liquid penetrant on a machined surface. It does not matter to me if I can repair additional materials besides the 4130. It would be an extra that would be nice. Should I have the author of the wps to change the base material to inconel instead of "inconel clad 4130"? Is there any place I can point out in the code to DNV that this is acceptable? I made my case and he kept going back to saying 4130 is the base material.

 

[metengr]

MrGezus;
Thanks for the clarification. So, yes, the so-called cold weld repair procedure should be Inconel to Inconel welding.