No need combine; you can use both wps individually on single joint.......... Why 2 wps are combined is to get benefit on thickness range... In your case , GTAW PQR thickness Base metal is less than 1/2'' (13mm) so you can not get thickness range extension .... If you have GTAW PQR with base metal thk 13mm & SMAW with Base metal 25mm; by combining these two PQR on one WPS you can weld GTAW on Base metal upto 5omm.... Refer QW 200.4 (b)..... Aly -------Original Message------- Date: 25/06/2012 18:52:21 Subject: RE: [MW:14678] RE: 14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only. Yes they may be combined. In this case the maximum base metal thickness will be governed by the most limiting qualified process thickness. This can, as in this case, result in one process governing the lower bound and the other process governing the upper bound. Since SMAW cannot be used to weld base metals with thickness less than 5mm, it is the lower bound for the combined WPS. Since GTAW cannot be used to weld base metals with thickness greater than 16mm it is the upper bound for the combined WPS. Hope this is clearer. John A. Henning Welding & Materials From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sevak hiren
Sent: Saturday, June 23, 2012 12:27 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14661] RE: 14600] RE: USE of PQR of GTAW+SMAW for new WPS GTAW process only. Thanks a lot sir for this clarification. I got most of the reviews that you can not combine two different welding process PQRs which are less than 13 mm thk, which is wrong assumption as per your clarification. Futher I would like to ask this question. Two different PQRs e.g. One GTAW Process only - Thk.8 mm & One SMAW Process only - Thk.12 mm (Both without impact test requirement) Can these two PQRs be combined to creat One WPS for GTAW + SMAW ? If yes then what will be the thk. range qualified for Base Metal ? Is it 1.5 To 24 mm OR 5 mm To 16 mm ? Thanks once again in advance. On Fri, Jun 22, 2012 at 10:06 PM, John Henning <jhenning@deltak.com> wrote: 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 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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