Multiple PQR Qualification

7/23/2019 Multiple PQR Qualification

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QW-200.4 (a) allows you to combine these two PQRs to support a single WPS. In such a case the WPS willbe restricted to the minimum range qualified by the PQR base metals (per QW-451); i.e. the intersection of thetwo individual qualified ranges. Therefore, your WPS would allow the following (assuming no impactrequirements):

Qualified base metal range: 5mm to 12mm ( 1.5mm < T1 < 12mm, 5mm < T2 < 30mm )

Maximum Qualified GTAW deposit: 12mm

Maximum qualified SMAW deposit: 12mm

REF: (from HSB site) Interpretations File No. BC-80-628, no interpretation number

Question (2): A WPS is being written for groove welding of pipe to utilize a GTAW root pass and SMAWfill. A previously qualified PQR welded on a in. thick test plate using GTAW and a previously qualifiedPQR welded on a 3/8 in. thick test plate using SMAW are to be used to support the combination WPS.What are the maximum thickness ranges of the combination WPS?

Reply (2): Based on Question (2), the deposited weld metal thickness range for the GTAW is 1/16 in.through in. and for the SMAW is 1/16 in. through in. The base metal thickness range for thecombination WPS is 1/16 in. through in.

Ref. also, HSB topic Specific Code FAQs:

it possible to apply two separately qualified WPS's to the same joint in combination without qualification of a combined PQR?

er QW-200.4, it is acceptable to apply both WPS's to the same joint without further qualification. The deposited weld metal quafied thickness of deposited weld metal for each WPS/process in a single joint. However, the user is cautioned that the maximubase metal thickness ranges cannot be "stacked" to qualify for a greater thickness in combination.

y opinion the italicized section also applies to the minimum qualified thickness as well as the maximum)

If impacts were required, since there would be no intersection of qualified base metal thickness, one could not combine

the two PQRs to support a valid WPS. New PQR(s) would have to be performed.

QW-200.4(b) is an exception to the general rules for root pass process qualified with a PQR with base metal thickness >13mm, and a second PQR for a fill process qualified with a base metal thickness greater than the base metal thicknessused with the root pass PQR. With the enquirers conditions, QW-200.4(b) does not apply as both PQRs would have tohave been performed on material thickness greater than 13mm which is not the case. One example of an acceptablecombination would be PQR 1 13mm thick base metal w/ GTAW root (for the purpose of example say 6mm depositthickness, t) combined with PQR 2: 38mm base metal thickness welded completely by SAW

These conditions would result in a combined WPS such as:


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Qualified base metal range: 5mm to 200mm

Qualified maximum GTAW deposit thickness: 12mm

Qualified maximum SAW deposit thickness: 200mm

Hope this helps - John

From: [email protected] [mailto:[email protected]] On Behalf OfpraveenalavandarSent: Wednesday, December 29, 2010 5:35 AMTo: [email protected]: Re: [MW:8984] Combination of PQR for WPS

manpreet,

you still cannot combine both these PQRs, you should either use PQR 1 or PQR 2.

Regards,

Praveen

--- On Wed, 12/29/10, manpreet wrote:

From: manpreet

Subject: Re: [MW:8979] Combination of PQR for WPSTo: "[email protected]"

Date: Wednesday, December 29, 2010, 3:25 PM

Dear Pravin,

Thanks for your valuable feedback.

I did consider QW-200.4(b) and wanted further calrification so i raised this point,now i would present actual ranges, no impact required


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PQR 1- 1.5mm to 12mm

PQR 2- 5mm to 30mm

Combined:- 5mm to 12mm, is it ok now?

RegardsManpreet Singh

On Wed, 29 Dec 2010 13:32:29 , praveen alavandar wrote

Manpreet,

You cannot support combining these two PQR's to prepare a WPS having a wide range from 1.5mm to 30mm,you are deviating from the clause QW-200.4(b) of ASME Sec.IX.

see below.

"For GTAW, SMAW, GMAW, PAW, and SAW, or combinations of these processes, a PQR for a process recording a test coupon that

was at least 12 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 shortcircuiting 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. The requirements of Note (1) of tables QW-451.1 and QW-451.2

shall apply."

So you will have,

for PQR 1 : WPS range : 1.5mm to 12mm (Without impact) & 2.5mm to 12mm (With impact) assuming you dont do a PWHT above

the upper transformation temperature.

For PQR 2: WPS range : 5mm to 30mm (Without impact) & 15mm to 30mm (With impact)

Regards,

Praveen


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--- On Wed, 12/29/10, Bathula Raghuram (Mumbai - PIPING) wrote:

From: Bathula Raghuram (Mumbai - PIPING)

Subject: RE: [MW:8975] Combination of PQR for WPS

To: "materials-welding" Date: Wednesday, December 29, 2010, 12:57 PM

5-12mm w/o impact, else 6-12mm

From: [email protected] [mailto:[email protected]] On Behalf OfmanpreetSent: Wednesday, December 29, 2010 12:03 PMTo: materials-weldingSubject: [MW:8974] Combination of PQR for WPS

Dear All,

Procedure qualification as per ASME sec ix,

I have 2 PQR:-*PQR 1- GTaw-6mm thick

*PQR 2- Smaw- 15 mm thick

What would be the thickness renge for base and weld metal?

for combined WPS, base metal thickness range shall be 1.5mm to 30mm, am i correct?

Regards

Manpreet Singh

Multiple PQR Qualification

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