--Sir,
To understand QW-200.4(b) please give me point wise reply
As per your below reply
1) Does it means, QW-200.4(b) does not restrict to combine two PQR to make one WPS even if the root process was
performed on below 13 mm base metal Thk.
2) in the below example of 6 mm GTAW PQR and 38 mm SAW PQR, for making new WPS base metal thk of coupon is
restricted upto 12 mm beyond 12 mm we cannot combine this two PQR.
3) by using 12 mm coupon we can weld upto 6 mm by GTAW and 6 mm by SAW or 3 mm by GTAW and 9 mm by SAW
And maximum qualified thk of new WPS will be 5 to 24 mm.
4) if we have 20 mm thk PQR welded by GTAW ROOT upto 5 mm and rest by SMAW, another PQR of 38 mm SAW then this
PQR could be used to make a combine WPS of thk between 5 to 200.
5) while combining WPS maximum thickness is limited to the lesser thickness qualified by either PQR what is the logic behind this?
Why we can not consider higher thk PQR?
From: John Henning [mailto:jhenning@deltak.com]
Sent: Wednesday, September 12, 2012 9:28 PM
To: Pankaj Kolhe (WF01 - WIN Water)
Subject: RE: [MW:14658] RE: 14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only.
Assuming impact qualification does not apply. . .
The general rule is that, the combined WPS maximum thickness is limited to the lesser thickness qualified by either PQR. e.g. combine GTAW PQR with base metal thickness 6mm and SAW PQR with base metal thickness 38mm – combine these two PQRs to support a single WPS and the base metal thickness is limited to 12mm (2 x min. qualified = 2 x 6mm = 12mm). Note that in this case the minimum thickness qualified will be governed by the SAW PQR or 5mm.
In the special case where the root process was performed on base metal exceeding 13mm in thickness {QW-200.4(b)}, then the limiting qualified maximum thickness, assuming fill process PQR base metal thickness is greater than 13mm, is determined by the qualified base metal thickness for the fill process. e.g. combine GTAW PQR with base metal thickness of 13mm and SAW PQR with a base metal thickness of 38mm then the maximum base metal thickness qualified for the combined WPS is 200mm.
John A. Henning
Welding & Materials
From: pankaj.kolhe@wipro.com [mailto:pankaj.kolhe@wipro.com]
Sent: Tuesday, September 11, 2012 11:58 PM
To: John Henning
Subject: FW: [MW:14658] RE: 14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only.
Sir,
Below is the Question asked by somebody followed by your answer
Now, if as per QW200.4 b a minimum of 13mm must be welded with the root process in order to "ride along" with the fill process to the maximum that fill process is qualified for. Then how can we combine the below PQR to make one WPS, because in the below PQR GTAW is welded upto 8 mm only and requirement is 13 mm.
Two different PQRs e.g. One GTAW Process only - Thk.8 mm & One SMAW Process only - Thk.8 mm
Can these two PQRs be combined to creat One WPS for GTAW + SMAW ?
If yes then what will be the thk. range qualified ?
Is it a must requirement as per Section IX that a minimum of 13mm must be welded with the root process in order to "ride along" with the fill process to the maximum that fill process is qualified for ?
YOUR ANSWER :
Yes. These can be combined. I assume that for both PQRs the base metal thickness was the same as the filler metal thickness, 8mm.
You then have a WPS qualified for base metal thickness (QW-451.1) 1.5mm to 16mm and each process qualified to a maximum deposit thickness of 16mm.
Such a WPS could be convenient since the amount of GTAW and SAW within a joint that is 16mm or less is not limited. At the extreme, the same WPS could be used to deposit the complete joint with GTAW or the entire joint could be done by SAW (assuming you have allowed for back gouging and back welding on the WPS).
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sevak hiren
Sent: Friday, June 22, 2012 8:03 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14655] RE: 14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only.
Two different PQRs e.g. One GTAW Process only - Thk.8 mm & One SMAW Process only - Thk.8 mm
Can these two PQRs be combined to creat One WPS for GTAW + SMAW ?
If yes then what will be the thk. range qualified ?
Is it a must requirement as per Section IX that a minimum of 13mm must be welded with the root process in order to "ride along" with the fill process to the maximum that fill process is qualified for ?
On Wed, Jun 20, 2012 at 1:47 AM, John Henning <jhenning@deltak.com> wrote:
Mr. Mohammed-Al-Wi,
Respectfully, you response is incorrect for the situation described. I believe Mr. Nakwal is asking if he can take a PQR performed with two process and split them into two separate WPS's, one for each process. This can be done per the last paragraph of QW-200.4(a) which states;
"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, non-essential, 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.
So, Mr. Nakwal has a PQR performed on base metal 8mm thick, with 3mm GTAW deposited metal and 5mm SMAW deposited metal.
Per QW451.1, it qualifies for GTAW: Base metal thickness 1.5mm ~ 16mm, and deposited GTAW filler metal to a maximum of 6mm
And it qualifies for SMAW: Base metal thickness 1.5mm ~ 16mm, and deposited SMAW filler metal to a maximum of 10mm
I suggest looking at Interpretations IX-78-47, IX-86-23 Q1 & Q2, IX-95-10, and IX-04-08. In addition, you might want to look at Interpretations IX-81-32, IX-86-01 and IX92-97.
QW-200.4(b) applies only when trying to COMBINE two PQR's with into a single PQR, where a minimum of 13mm must be welded with the root process in order to "ride along" with the fill process to the maximum that fill process is qualified for. An example would be a GTAW PQR with 13mm thickness combined with a SAW PQR with 38mm thickness to yield a WPS with a GTAW root and SAW fill qualified to for base metal thickness range of 5mm to 200mm. The GTAW process in this example would be limited to a deposited thickness of 26mm.
Let me know if you have any questions.
John A. Henning
Welding & Materials
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ahmraha@yahoo.com
Sent: Tuesday, June 19, 2012 8:39 AM
To: materials-welding@googlegroups.com
Subject: [MW:14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only.
-----Original Message-----
From: mohd
Sent: 15/06/2012, 9:53 am
To: Materials & Welding
Subject: [MW:14556] Re: USE of PQR of GTAW+SMAW for new WPS GTAW process only.
Dear all,
if you go through 200.4(b) 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 1⁄2 in. (13 mm) is required hence u cant creat two WPS.
Regrds,
Mohammed-AI-WI.
On Jun 11, 5:02 am, Parveen Kumar Nakwal <pknak...@gmail.com> wrote:
> Dear Experts,
>
> Can we use S.S to S.S 8mm base metal thickness PQR of GTAW (3mm)+SMAW
> (5mm) for the making for new WPS of S.S to S.S with GTAW only, with
> 2mm base metal thickness only ?
>
> Waiting for reply..
>
> Regards.
> Parveen K. Nakwal
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