Materials & Welding: Re: [MW:35653] Clarification Required on Welder Qualification

Friday, June 6, 2025

Re: [MW:35653] Clarification Required on Welder Qualification – P-No. 8 vs. P-No. 45 (ASME Section IX)

Simple answer - for the base metals yes, for filler metals you have to check the filler group.

Detailed answer -

If a welder is qualified using a base metal listed on the left side of Table QW-423 (ASME Section IX), they are qualified to weld all the base metals listed on the corresponding right side of that row — provided all other essential variables remain unchanged.

In your specific example:

P-No. 8 (e.g., austenitic stainless steel) to P-No. 45 (e.g., high-alloy austenitic stainless steel such as Alloy 20)
You need to check if P-No. 8 appears on the left and P-No. 45 appears on the corresponding right in the same row of Table QW-423.
If it does not, then a separate performance qualification is required for P-No. 45.

Additionally, for welder performance qualification, the F-Number of the filler metal is also important. A welder is only qualified to weld using filler metals with the same F-Number (or a group of F-Numbers if permitted by the code). So, if the F-Number of the filler used for P-No. 8 is different from what is required for P-No. 45, a new qualification may be needed.

Best regards,

Rao Gundala

On Thu, May 29, 2025 at 12:47 PM Karuppa Samy <samyqc08@gmail.com> wrote:

Hello Everyone,

I would like to clarify whether a welder who is qualified using the GTAW process on P-No. 8 material is also permitted to weld P-No. 45 material, or if a separate qualification is required for P-No. 45.

Additionally, I would appreciate it if someone could provide a brief explanation regarding the relevant table in ASME Section IX that addresses this qualification range.

Your expert input on this matter would be highly appreciated.

Regards,
K. Karuppasamy

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