Combine PQR support to WPS

Hi Experts!
Question : PQR A is welded with SMAW to join 16 mm thick plates with 16 mm of SMAW deposit. PQR B is welded with GTAW and SAMW to join 8 mm thick plates with 3 mm of GTAW and 5 mm of SMAW deposit. Range thickness for WPS combined of both PQR when CVN not require ?

1 Like

Accordance to ASME IX, QW-451 and QW-200.4 - more than one WPS specifying different processes, filler metals, or other essential or supplementary essential variables is used in a joint, QW-451 shall be used to determine the range of base metal thickness and maximum weld metal thickness qualified for each process, filler metal, or set of variables, and those limits shall be observed.

  • PQR-A: max. 32 mm - range of qualification 5 to 32 mm.
  • PQR-B: max. 16 mm - range of qualification 1.5 to 16 mm.

Combine PQR-A & PQR-B: range of qualification from 1.5 to max. 48 mm deposited weld metal and base metal. Also see related topic - combination of welding procedure. or see an example at QW-200.2 [f].
Consider PWHT and preheat for weld joint (ASME VIII Div. Table UCS-56-1 General Notes and ASME B31.3.

Thank @bien for your answer,
That mean is range thickness (1.5 to 32mm) or (1.5 to 48mm) ?
By the way, I found that QW200.4 (b) mention as below :
β€œwhen making root deposits only using GTAW, SMAW, GMAW, PAW, LBW, LLBW, and
SAW, or combinations of these processes, a PQR for a process recording a test coupon that was at least 1/2 in. (13 mm) thick may be combined with one or more other PQRs recording another welding process and any greater base metal thickness. In this case, the process recorded on the first PQR may be used to deposit the root layers using the process(es) recorded on that PQR up to 2t (for short‐ circuiting type of GMAW, see QW-404.32) in thickness on base metal of the maximum thickness qualified by the other PQR(s) used to support the WPS”.
Please explain more. Thank you

1 Like

Please see my correction at above reply.

Hi BiΓͺn,
Why is max 48mm ? Reference to example QW-200.2 [f], I think max 32mm is correct .

As far as i know,
QW 200.2f Applicable to the same process .
If you want to combine pqrs then follow 200.4 a and 200.4b .
where 200.4b is the alternate method to get a longer base metal range but there is restriction on welding process and thickness of pqr ,which must be greater than 13mm.
You cant use qw-200.4b here.

But you can use 200.4a in that case ur base metal thickness would be-5mm to 16mm

Standard Designation: BPV Section IX
Edition/Addenda:
Para./Fig./Table No:
Subject Description: Section IX, QW-200.2(f) and QW-200.4
Date Issued: 09/19/1985
Record Number: BC85-328
Interpretation Number : IX-86-06
Question(s) and Reply(ies):
Question: Does the combination of 2 PQRs, each of different processes, support a WPS combining the two processes in a single joint, with all essential and supplementary essential variables unchanged?

Reply: No.

Standard Designation: BPV Section IX
Edition/Addenda: 2013
Para./Fig./Table No: QW-200.2(f) and QW-451.1
Subject Description: SC IX; QW-200.2(f) and QW-451.1
Date Issued: 09/11/2014
Record Number: 14-786
Interpretation Number : IX-15-05
Question(s) and Reply(ies):
Background: One PQR was qualified with GTAW on a test plate thickness of 3/8” (0.375”). A second PQR was qualified with SMAW on a test plate thickness of 3/4” (0.75”).

Question: Can a WPS supported by both PQRs be qualified for 1/16” (0.0625”) to 3/4” (0.75”) without the minimum thickness applicable to the SMAW process being restricted to 3/16” (0.1875”) per QW-451.1?

Reply: No

Hi Experts,
The finally, which statement is correct ?

@hieu-tt, base metal and weld metal thickness qualified for each process or each set of variables.
QW-200.4 [a]…base metal thickness and maximum weld metal thickness qualified for each process, filler metal, or set of variables.

My understanding, max. base metal thickness and weld metal thickness determined each PQR and included in the new WPS, 48mm max.

This interpretation IX-15-05 for minimum thickness of deposited weld metal of SMAW. It should be from 0.4875" to 0.75"*2 (Table QW-451).