Welder Qualification

[ANOOP KUMAR]

when a welder is suppose to be qualified using a specific PQR can we use a test coupon within the range of what qualified in the PQR or should we use the same test coupon used in the PQR.
For example "if the PQR is qualified for 6" SCH 80 Pipe (which will qualifies for 2-7/8" & above.) at the time of welder qualification can we use a 3" SCH 40 pipe for qualification using the same PQR"??

 

[gtaw]

Welder performance qualification is a separate function from qualifying a welding procedure specification. If you are working to ASME Section IX, the mechanics of qualifying a WPS is addressed in Article II. The mechanics of qualifying a welder is addressed by Article III. Article IV provides specific information only when a specific provision in Article IV is referenced by Article II or Article III. The provision only applies to the Article that referenced the provision in Article IV. Don't mix apples and oranges when using ASME.

The WPS is used by the welder when taking the performance qualification test. The welder has no reason to reference the supporting PQR, nor does the welder need access to the supporting PQR.

The basic premises followed by AWS is similar to ASME with regards to the qualification of the WPS and the welder's performance qualification test. There is no need for the welder to have access to the PQR. The welder should be following the WPS provided by the contractor. It doesn't matter whether the WPS is prequalified (not supported by testing) or if the WPS is supported by a PQR (the WPS doesn't meet the requirements for prequalification such as would be the case if the welder is required to weld a complete joint penetration groove weld from one side without backing or back gouging). The WPS is the working document providing information to the welder for the purpose of taking the performance qualification test or a production weld.