QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
(OP)
Hello Everyone,
This is my first post here. Hope to find the solution to my query with respect to QW-200.4 of ASME Sec. IX.
Here I go!!
PQR A is qualified in 25 mm base metal thickness with 10 mm of GTAW & 15 mm of SMAW weld deposits. PQR B is qualified in 8 mm base metal thickness with 3 mm of GTAW & 5 mm of SMAW weld deposits. In both the PQRs, the tensile and bend tests have been carried out satisfactorily.
Can I generate a single WPS of GTAW process only with base metal thickness range as 1.5-50 mm, GTAW weld deposit max thickness - 20 mm ?
The production joint thicknesses are 4.55 mm and 12 mm and do not require impact testing and have to be welded entirely with GTAW process only.
Also can I generate a second WPS of GTAW+SMAW process with base metal thickness range as 1.5-50 mm, GTAW weld deposit max thickness - 20 mm, SMAW process weld deposit max thickness - 30 mm ?
Thanks to all in advance.
This is my first post here. Hope to find the solution to my query with respect to QW-200.4 of ASME Sec. IX.
Here I go!!
PQR A is qualified in 25 mm base metal thickness with 10 mm of GTAW & 15 mm of SMAW weld deposits. PQR B is qualified in 8 mm base metal thickness with 3 mm of GTAW & 5 mm of SMAW weld deposits. In both the PQRs, the tensile and bend tests have been carried out satisfactorily.
Can I generate a single WPS of GTAW process only with base metal thickness range as 1.5-50 mm, GTAW weld deposit max thickness - 20 mm ?
The production joint thicknesses are 4.55 mm and 12 mm and do not require impact testing and have to be welded entirely with GTAW process only.
Also can I generate a second WPS of GTAW+SMAW process with base metal thickness range as 1.5-50 mm, GTAW weld deposit max thickness - 20 mm, SMAW process weld deposit max thickness - 30 mm ?
Thanks to all in advance.





RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
To answer your first question, no because you are stating a single process, GTAW. As such, the qualified base metal thickness would equal the weld deposit thickness for this WPS, so the GTAW process would be qualified to 20mm with a base thickness range to 20mm using PQR A.
WPS GTAW process, BM thickness range of 1.5mm to 20mm, and weld deposit thickness range of 1.5mm to 20mm.
Yes.
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Standard Designation: BPV Section IX
Edition/Addenda:
Para./Fig./Table No:
Subject Description: QW-200.4(b)
Date Issued: 12/08/2011
Record Number: 10-1966
Interpretation Number : IX-10-34
Question(s) and Reply(ies): Background: PQR A is welded with SMAW to join 5/8 in. (16 mm) thick plates with 5/8 in. (16 mm) of SMAW deposit. PQR B is welded with GTAW and SAMW to join 5/16 in. (8 mm) thick plates with 1/8 in. (3 mm) of GTAW and 3/16 in. (5 mm) of SMAW deposit. PQR C is welded with GTAW to join 3/16 in. (5 mm) thick plates with 3/16 in. (5 mm) of GTAW deposit.
Question (1): Do PQRs A and B qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/4 in. (32 mm) when impact testing is not required?
Reply (1): No.
Question (2): Do PQRs A and B qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/2 in. (38 mm) when impact testing is not required?
Reply (2): No.
Question (3): Do PQRs A and B qualify the combination WPS for a maximum deposit weld metal thickness range of 1/4 in. (6 mm) for the GTAW process and 1 1/4 in. (32 mm) for the SMAW process?
Reply (3): No.
Question (4): Do PQRs A and C qualify the combination WPS for a maximum deposit weld metal thickness range of 3/8 in. (10 mm) for the GTAW process and 1 1/4 in. (32 mm) for the SMAW process?
Reply (4): No.
Question (5): Do PQRs A and C qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/4 in. (32 mm) when impact testing is not required?
Reply (5): No.
Question (6): Do PQRs A and C qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/2 in. (38 mm) when impact testing is not required?
Reply (6): No.
Question (7): Do the provisions in QW-200.4(b) affect the responses to the above questions?
Reply (7): No.
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Have another read of QW 200.4(b) and it may become clearer.
To enable the combination of two PQR's to give the range noted in the interpretation (Q 1 & 3) then PQR B would have to be at least 1/2"(13 mm) thick.
You cannot combine your two PQR's and achieve the range you noted above as again, does not comply with QW 200.4 (b)
Not sure what your problem is with your production joints ?
Welding GTAW only as per interpretation below
Interpretation: IX-92-97
Subject: Section IX, QW-200.4(a), Combination of Welding Procedures
M-92-97-IX-92-99
Date Issued: May 20, 1994
File: BC94-167
Question: According to QW-200.4(a), when a qualified WPS for a combination process is available,
must a new WPS be generated if only one of the processes is to be used in production, provided
all requirements of Section IX for the process used are met?
Reply: No.
gives you this range
PQR A - BM 5-50 mm / WM GTAW max 20 mm (this is fine for your 12 mm production joints)
PQR B - BM 1.5 - 16 mm / WM GTAW max 6 mm (this is fine for your 4.55 mm production joints)
Cheers,
DD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
My client insists that I generate separate WPS specifying GTAW only to weld both the joints.
And hence the question whether I can make one WPS of GTAW with BM range as 1.5-50 mm /WM GTAW - 20 mm max or I need to make two different WPSs, each specifying GTAW only but ranges as suggested by you.
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Does this means that for a corner joint that is made between 4.55 mm and 26 mm BM thicknesses with a weld deposit of 4.55 mm only, I will have to qualify a new PQR to cover the BM thickness range ?
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Please advise why PQR A is not valid to 50 mm BM as I noted ?
PQR A - BM 5-50 mm / WM GTAW max 20 mm (this is fine for your 12 mm production joints)
sushildwivedi16,
Have another look at what I have posted
4.55 mm is less than the 5 mm minimum qualified so yes, you will need another PQR for that range.
Cheers,
DD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
PQR A can indeed be used to support a WPS for 50mm base metal thickness. Using QW-451 as long as I select a weld coupon thickness and perform welding with a process, I can take credit for 2T for the BM and 2t for the weld deposit. I was thinking of full penetration groove welds versus partial penetration weld qualification, which defaults back to QW-451.
For the corner joint, a new PQR is necessary as you stated.
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
My apologies - I was getting tied up with QW 200.4 and basing my comments on the negative responses in the interpretation above.
What is really confusing is this
Interpretation Number : IX-10-34
Question(s) and Reply(ies): Background: PQR A is welded with SMAW to join 5/8 in. (16 mm) thick plates with 5/8 in. (16 mm) of SMAW deposit. PQR B is welded with GTAW and SAMW to join 5/16 in. (8 mm) thick plates with 1/8 in. (3 mm) of GTAW and 3/16 in. (5 mm) of SMAW deposit. PQR C is welded with GTAW to join 3/16 in. (5 mm) thick plates with 3/16 in. (5 mm) of GTAW deposit.
Question (1): Do PQRs A and B qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/4 in. (32 mm) when impact testing is not required?
Reply (1): No.
QW 200.2
[e.g., a single WPS may cover a thickness range from 1/16 in. (1.5 mm) through 1 1/4 in. (32 mm) if PQRs exist for both the 1/16 in. (1.5 mm) through 3/16 in. (5 mm) and 3/16 in. (5 mm) through 1 1/4 in. (32 mm) thickness ranges].
What is the difference between QW 200.2 and Question 1 ?
Cheers,
DD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Maybe this clarifies
Interpretation: 1-46-O6
Subject: Section IX, QW-200.2(f) and QW-200.4
Date Issued: September 19, 1985
File: BC85-328
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.
So, as you stated if PQR A was GTAW/SMAW and PQR B was GTAW/SMAW then 1.5 to 50 mm would be applicable.
QW 200.4 (b) allows the combination of 2 x PQRs with different processes but this is governed by the minimum thicknesses I noted above.
Cheers,
DD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Simple answer to the original post questions is: Yes.
Interpretation IX-10-34 reply is "No" because it does not satisfy QW-200.4(b).
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Have a nice day.
SD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
You are incorrect, the original post is a "No".
You are also incorrect here - Interpretation IX-10-34 reply is "No" because it does not satisfy QW-200.4(b).
I apologised as I was initially confused by the reference to QW 200.4 (b) so I sent an e-mail to someone who knows more about ASME IX than anyone ( Walt Sperko, current Chairman of the ASME IX committee).
This is what I copied & pasted from above.
Interpretation Number : IX-10-34
Question(s) and Reply(ies): Background: PQR A is welded with SMAW to join 5/8 in. (16 mm) thick plates with 5/8 in. (16 mm) of SMAW deposit. PQR B is welded with GTAW and SAMW to join 5/16 in. (8 mm) thick plates with 1/8 in. (3 mm) of GTAW and 3/16 in. (5 mm) of SMAW deposit. PQR C is welded with GTAW to join 3/16 in. (5 mm) thick plates with 3/16 in. (5 mm) of GTAW deposit.
Question (1): Do PQRs A and B qualify the combination WPS for a base metal thickness range of 1/16 in. (1.5 mm) to 1 1/4 in. (32 mm) when impact testing is not required?
Reply (1): No.
QW 200.2
[e.g., a single WPS may cover a thickness range from 1/16 in. (1.5 mm) through 1 1/4 in. (32 mm) if PQRs exist for both the 1/16 in. (1.5 mm) through 3/16 in. (5 mm) and 3/16 in. (5 mm) through 1 1/4 in. (32 mm) thickness ranges].
What is the difference between QW 200.2 and Question 1 ?
This is Walts response (which has nothing to do with QW 200.4 (b))
Shane,
GTAW is not qualified for more than 5/8 in base metal thickness. If the question had been only for SMAW, the answer would be yes.
Walt
This is exactly what metengr noted above.
Regards,
DD
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures
Original post has nothing to do with QW-200.4(b). OP uses the same processes in two different PQRs. Much like the QW-200.2 example you listed above.
RE: QW-200.4 of ASME Sec. IX_Combination of Welding Procedures