Clarification Required on Welder Qualification – P-No. 8 vs. P-No. 45 (ASME Section IX)
Karuppa Samy
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.
Vishwas Keskar
On 29 May 2025, at 11:47 AM, Karuppa Samy <samy...@gmail.com> wrote:
--<image.png>Regards,K. Karuppasamy
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venkateswara reddy Desireddy
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Kannayeram Gnanapandithan
Srinivas Gundala
In your specific example:
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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
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sridhar cn
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.