I have one query regarding above mentioned subject. Our project specification require weld overlay deposited with minimum 2 layers (first layer SS309 and second layer SS347) but our contractor has procedure that qualified with two layer SS309. Is it can be acceptable ? if not what should i do ? Which code and standard should i refer to accept or reject it . Please help me. Thank you

Tong2je,

The Code and standard you refer to can only be the Code addressed in your specification.
If the spec does not refer to any Code, I see no reason to reject the fabricators WPS qualification.

Assuming that ASME Code Section IX is specified and used for the WPS qualification, for CRO welding,
QW-404.37 applies, which says:

.

In my opinion the Welding responsible of the fab shop should be asked to explain the WPS qualification, and how he intends to meet the requirements of the Code. The AI performing the inspection, would also not be able to accept the qualificaion that you described.

DK

Dr. Koelbl,

Thank for the explanation. But I still confuse and really need your advice in this matter. 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 SS410S(Middle to bottom section) and SS347(top section). After referring to API 582 Appendix B table B-1, recommendation of filler selection for

1. SS410S is ERNiCr-3 for 1st and 2nd layer
2. SS347 is ER309Cb for 1st layer and ER347 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 procedure (as mentioned before) qualify to clad SS410S and SS347.

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

Tong2je,

Is ASME Section IX part of your contract with the contractor, if not, what is the technical basis?

DK

Dr. Koelbl,

Yes, all welding procedures related to this project shall be qualified in accordance with ASME Section IX

In this case it is easy just to repeat:

For GTAW CRO welding, QW-404.37 applies, which says:

Quote:
.. A change in the UNS number for each AWS classification of A-No. 8 or A-No. 9 analysis of table QW-442,
or each nonferrous alloy in table QW-432, shall require separate WPS qualification
.
A WPS qualified with a test coupon welding AWS classification ER309Cb is good for ER309Cb only. In order to weld ER347, which is a different classification, a separate qualification shall be required. And another qualification is of course required for ERNiCr-3. This is how I read QW-404.37.

Maybe this helps. Any Inspector on the job who can interfere?

DK

Dr. Koelbl,

Thank one again for your help..I will explain to my boss and let him to decide.

Tong2je,

I think the key to your question are the required inspections and tests of CRO PQR's acc. to QW-453. One of the required tests is the chemical analysis acc. to note (9) of table QW-453:

_________________
Kind regards,
Juergen Fleischfresser