ASME Code Section IX QW-200.4

[A.Ruppel]

Our client has made the following comments: "As per ASME Code Section IX QW-200.4, the combination of PQRs may be carried out with a minimum coupon thickness of 13 mm for root pass process and a thicker coupon for the remaining processes. Coupon with thk<13mm cannot be used for PQR combination"

Is this statement correct?

Thanks in advance.

[Dr. Kölbl]

Mr. Ruppel,

In my opinion
1) the statement is not correct and

2) your WPS qualification is also not correct.
I just looked at your Base metal thickness, where we have 8,7mm for GTAW PQR , which does not qualify the 20mm in the WPS.

With respect to QW-200.4 a) the combination of any PQRs is permitted:

When following a WPS that has more than one welding
process, filler metal, or set of variables, each process, filler
metal, or set of variables may be used individually or in
different combinations, provided
(1) the essential, nonessential, and required supplementary
essential variables associated with the process,
filler metal, or set of variables are applied
(2) the base metal and deposited weld metal thickness
limits of QW-451 for each process, filler metal, or
set of variables are applied

The trick of subparagraph b) is that you can qualify the GTAW root for a 100mm thick plate on a 13mm plate, and you need not weld a 38mm PQR. But I am sure there will be other comments as well.

Greetings
DK

[Yoges]

Hi All,


As per QW-200.4(b) the combination process (GTAW+SAW) could not be used as Root deposited PQR (GTAW) had not qualified with at least 13mm.

Please correct me, if my interpretation wrong.

Thanks.

Yoges

[MichaelPorter]

As per QW-200.4(b) the combination process (GTAW+SAW) could not be used as Root deposited PQR (GTAW) had not qualified with at least 13mm.

I would also like to know if the above interpretation is correct or not.

[Dr. Kölbl]

Michael,

to me it sounds correct, and Yoges has essentially the same reply as I had to the original question.

If you want to qualify the root of a weld in thick material, it is important to qualify the "DEPOSITED WELD METAL THICKNESS" and the "Base Metal thickness".

FOr the second, you must have a test plate of at least 13mm thickness, this will qualify not only to 26, but more, as per QW-200.4

Would you agree?

[RoyJackson]

Michael,

to me it sounds correct, and Yoges has essentially the same reply as I had to the original question.

If you want to qualify the root of a weld in thick material, it is important to qualify the "DEPOSITED WELD METAL THICKNESS" and the "Base Metal thickness".

FOr the second, you must have a test plate of at least 13mm thickness, this will qualify not only to 26, but more, as per QW-200.4

Would you agree?

Thanks for pointing out about the thickness of the test plate. That was where I was going wrong.

[Dr. Kölbl]

Never mind.This is a very frequent mistake, and we spend a lot of efforts in our seminars on the distinguising of "T" and "t". I am happy I could help.

[osborn ronald]

Our client has made the following comments: "As per ASME Code Section IX QW-200.4, the combination (link removed by guard) of PQRs may be carried out with a minimum coupon thickness of 13 mm for root pass process and a thicker coupon for the remaining processes. Coupon with thk<13mm cannot be used for PQR combination"

Is this statement correct?

Thanks in advance.

When I read ASME Interpretation as follow: Background: A combination GTAW and SMAW WPS is supported by two PQRs. PQR A is welded with SMAW to join 11&#8260;2 in. (38 mm) thick plates with 11&#8260;2 in. (38 mm) of SMAW deposit.

[Ballbearing]

I do not have permission to open the WPS so it is difficult to comment.

Interpretation: IX-04-18
Subject: QW-200.4(b), Combining Procedure Qualification Records
Date Issued: March 8, 2005
File: BC05-025
Background: A combination GTAW and SMAW WPS is supported by two PQRs. PQR A is welded
with SMAW to join (38 mm) thick plates with (38 mm) of SMAW deposit. PQR B is welded
with GTAW and SMAW to join (13 mm) thick plates, with (3 mm) of GTAW deposit, and (10 mm) of SMAW deposit.
Question (1): Do PQRs A and B qualify the combination WPS for a base metal thickness range of
(5 mm) to (200 mm) when impact testing is not required?
Reply (1): Yes.
Question (2): Do PQRs A and B qualify the combination WPS for a maximum deposited weld metal
thickness of (6 mm) for the GTAW process and (200 mm) for the SMAW process?
Reply (2): Yes.

This appears to show you do not need 13 mm of GTAW but you do need a coupon that is at least 13 mm thick.
Regards,
Shane

[Ballbearing]

WPS/PQRs now available and I agree with both of Dr Kolbls initial responses,
The client is incorrect and the WPS base metal and deposited weld metal are incorrect.
Regards,
Shane