[MW:1647] Re: 1638] Re: WPS from 2 PQRs

Dear John,

Thank you very much for this explanation with good example. I would like to know that in your given example , how do you calculated the base material thickness range ( 10mm - 200mm ) instead of 5mm - 200mm . kindly advice.

 

Thanking you,

Regards

Sukamal Naskar

Welding Engineer

 

On 2/26/09, John Henning <jhenning@deltak.com> wrote:

The short answer is no.

When combining multiple PQR's to support a single WPS, you are limited to the most restrictive essential variable or supplemental essential variable found on the PQR's.  If I understand correctly, in your case you have one PQR using the GTAW process qualified on 4mm thick plate and a second PQR using the SMAW process on 10mm thick plate.  I assume only GTAW or SMAW was used either PQR and that the full thickness of base metal was welded.

Then, you can write the following WPS's:

GTAW on plate, 1.5mm to 8mm, with weld deposit thickness to 8mm

SMAW on plate, 1.5mm to 20mm, with deposit thickness to 20mm

Combined GTAW and SMAW, plate thickness qualified 1.5mm to 8mm, both GTAW and SMAW deposit to the maximum thickness of 8mm.  The base metal thickness is limited for both process as the GTAW weld can ONLY be performed on base metal to a maximum of 8mm thick.

The only exception can be found in QW-200.4 (b).  When a process is used for the root weld and is qualified on a base metal 13mm and thicker, then that PQR can be used in combination with another PQR qualified for any greater thickness to write a single WPS.  The root process is limited to 2 times the deposit thickness performed on the first PQR.

An example:  PQR 1 - Qualified on 15mm plate, root weld GTAW with deposit thickness 5mm, balance of weld SMAW (10mm)
            PQR 2 - SAW qualified on 40mm plate (back gouged and back welded) with deposit thickness 40mm
           (Assuming all other essential variables are satisfied and impacts are not required)

WPS supported by PQR 1 with GTAW root and PQR 2 SAW fill:
    Qualified base metal thickness range:  10mm to 200mm  (QW-451.1 range for SAW)
    Maximum qualified GTAW root deposit thickness:  10mm  (2t - GTAW)
    Maximum qualified SAW deposit (fill) thickness:  200mm

Reference:  Interpretations IX-81-32, IX-04-18, IX-80-NNAE


Hope this helps.

John Henning
Senior Welding Engineer


-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of VJ V
Sent: Wednesday, February 25, 2009 1:15 AM
To: Materials & Welding
Subject: [MW:1638] Re: WPS from 2 PQRs


Dear Prasad,
Let me make it clear...

QW 200.2(f) states about One WPS from several PQRs and vise versa.

Assume, I have got a PQR of GTAW of 4mm thick, and another PQR of 10mm thick SMAW.
I would like to write a WPS for 20mm thick with GTAW+SMAW as the above mentioned PQRs supporting(Assume all other variables are meeting the req.)----Is it possibe ?



Is it possibel to write a WPS of (4+10)x 2 = 28mm thick (2t range)?



As I qouted earlier, QW 200.2(f) gives an example about write a WPS for 1.5mm thick thru 32mm thick.So the PQRs may be of (1)which cover upto 1.5mm to 5mm thick for its WPS (2) which cover from 5mm to 32mm thick.

Regards


On Feb 24, 10:02 am, VJ V <veeve...@gmail.com> wrote:
> Hi everyone,
>
> I would like to know reg Sec IX,QW 200.2(f) and QW 200.4(a)
>
> 200.2(f) states " A single WPS may cover several essential variable
> changes......(eg. a single WPS may cover a thinkness range from 1.5mm
> thru 32mm if PQR exist for both 1.5 to 5mm and 5mm thru 32 mm ranges)
>
> But QW 200.4(a) states if all essential/supplementary essential
> variable according to QW 451 is meeting then ......
>
> My doubt is this: As per 200.2(f), "Base metal range" is not meeting
> the requirement of QW 451.
>
> But QW 200.4(a), states base metal thickness range, weld metal
> thickness range etc shall meet QW 451.
>
> Can anybody please clarify...
>
> Regrds


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