Combining ASME Group Numbers

[PTBITT]

I am trying to develop a WPS that would qualify the following base metals and thickness range using the SMAW process with low hydrogen rod.
P-No 1 - Group No 1, 2, 3 to P-No 1 - Gr No 1, 2, 3. With a thickness range of .216" to 2". Impact testing and PWHT will be required.

Would the following PQR's create a WPS that will cover all combinations of P1-Gr1, 2, 3 with a thickness range of .216” to 2”. Or would each combination (Gr.1-2, 1-3, 2-3) require a PQR with each wall thickness (.216”, .375’, 1”).
PQR 1 – P1-Gr1 to P1-Gr2. Wall thickness = .216”
PQR 2 – P1-Gr1 to P1-Gr3. Wall thickness = .375”
PQR 3 – P1-Gr2 to P1-Gr3. Wall thickness = 1”

 

[Dhurjati Sen]

Does any of the PQRs contain impact testing and PWHT?
Probably they don't, so answer is NO.

 

[PTBITT]

All PQR's will have impact testing and PWHT

 

[gtaw]

You mentioned that the WPS is for SMAW using F4 electrodes. So, that being the case, you have to satisfy QW-403.5 and QW-407.2. I listed those because those are probably the determining factors that are the more difficult to satisfy. The other articles are not as difficult to comply with. It will be a challenge without a doubt.

Best regards - Al

 

[david339933]

You can't use PQR 2 to increase the thickness with PQR 1 as they aren't the same group #.

Why not: P1G1 - P1G2: 1" coupon no impacts = 3/16" - 2" qualified. Then do a .250" coupon using the same variables with the addition of impacts = .125" - .500" qualified: Combine the two PQRs: Result .125" - 2" with impacts qualified.

Then do the same for the other combinations.

PWHT will need to cover the max thickness....or more for repairs.