CASTI Guidebook to ASME Section IX, Micheal Houle, 2nd Edition:
pg 222 - QW-401.3 provides for a PQR which has been previously qualified to satisfy all requirements other than notch-toughness to be used in conjunction with a nothc toughness PQR test coupon. A separate PQR test coupon may be prepared, using the same welding procedure, addressing the same essential variables, but also addressing all of the required supplemental essential variables. The separate PQR test coupon need only be long enough to provide the necessary notch toughness specimens. In other words, QW401.3 makes it clear that the non-notch toughness and notch toughness properties may be established using separate test coupons.
I learned soemthing new today (yet again).
Section IX QW401.3 backs this up. This paragraph is not referenced in any of the QW250 tables, but it looks pretty obvious to me that it applies to all PQR/WPS.
I can scan a bunch of this guide and email it if you want. There is more here that backs this practice up.
Charles.
Charles,
Thank you very much for your responses. The wording in ASME IX is difficult sometimes so I appreciate your help.
So QW 401.3 and QW 403.5 say that I can weld P1Gr2 from a P1Gr1 WPS/PQR + P1Gr2 impact test results? Wow. Talk about "You see what you are prepared to see." I have the CASTI book and I actually had previously read that example, but somehow my brain did not interpret or understand it this way. I was too convinced that I needed a Group 1 to Group 2 tensile test.
Thank you Charles and jon20013 for your enlightening answers.
That is the way I have always understood ASME IX.
Another way to look at it is:
If you qualify a P1 to P1 procedure without impact tests, you are qualified to weld all P1 material without impacts regardless of the group number since the group number is not an essentail variable. So the PQR in question supports P1G1 to P1G1, P1G1 to P1G2, and P1G2 to P1G2. When you add the CVN requirements, then you would have to qualify all 3 combinations seperately, with CVN tests only since the group number is a supplementary essentail variable.
Greg; what's your read of QW-403.5(c); about half way down the paragraph, which begins... "If, however, the procedure qualification....". My read is the Group number wouldn't necessarily require qualification as long as all of the same variables were used for the Gr.2 to Gr. 1.
That's what I get for doing things from memory. Fogetting exemptions like that. I agree that if all essentail variables are the same, it can eliminate some testing. For instance, I would say that if you had to do a qualification for G1 to G1, and G2 to G2, and G1 to G2, then a PQR with G1 to G2 would cover it as long as CVNs were taken from both sides of the weld in the HAZ.
The paragraph also says that if the essential variables are the same on the "procedure specifications" (or WPSes) then the combination can be performed. So I would think that as long as the supplementary essential varibles as supported by each PQR are complied with on the WPS, then I think combining a 3/8" thick G1 to G1 test with a 1/2" thick G2 to G2 test would get you the combination of G1 to G2 with a thickness limit of 1/2" - 3/4".
Exactly what I was saying in my first post Charles.
Charles, you are correct, QW-401 is not referenced in any QW-200 or QW-300 Table because it is general information that describes the variables for Procedure and Performance Qual. You'll see QW-401.1 and QW-401.3 apply to Procedure Quals where QW-401.2 and QW401.4 apply to Performance quals.
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