Re: [MW:35655] Clarification Required on Welder Qualification – P-No. 8 vs. P-No. 45 (ASME Section IX)

A welder qualified using the GTAW process on P-No. 8 material is generally permitted to weld P-No. 45 material without a separate 

qualification, provided no essential variables have changed. This allowance is based on the grouping of base metals into P-Numbers 

in ASME Section IX, which groups similar materials so that qualification on one material covers others in the same group or related groups.

 

·   Table QW-423 in ASME Section IX lists base metals by their P-numbers and groups them into rows. This table defines which materials 

    can be considered equivalent for welder qualification purposes. If a welder is qualified on a base metal in a given row, they are qualified 

    to weld other base metals in the same row without requalification. 

Hence,

·    Welder qualified on GTAW P-No. 8 → permitted to weld P-No. 45 without requalification, if the filler metal (F-No.) is the same.

·     No changes in essential variables such as joint design, backing, thickness, welding position, or process.

·    The QW-423 table in ASME Section IX governs this equivalency and substitution of base metals for welder qualification.

This approach streamlines welder qualification by grouping similar materials and avoiding redundant testing while ensuring weld quality and 

code compliance. 

C Sridhar.

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On Thu, 29 May 2025 at 21:41, venkateswara reddy Desireddy <dvreddy82@gmail.com> wrote:

No need new qualification. Please let me why new qualification required?

On Thu, 29 May 2025, 4:09 pm Vishwas Keskar, <vvkeskar123@gmail.com> wrote:

New qualification is required 

Sent from my iPhone

On 29 May 2025, at 11:47 AM, 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.

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Regards,

K. Karuppasamy

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