[MW:1648] Re: 1638] Re: WPS from 2 PQRs

Good Explanation by John, I would like to correct the Qualified thickness
range in the example. It should be 4.8 throgh 200 mm. (Of course, it is
minor correction and probably due to use of conservative range for multiple
standards of qualification.)

Also, I would like to add as follows:

It is very common to mix up two variables (BM thickness -T and weld thick.
t). If we separately deal with the two variables, there will be no
confusion.

I would suggest VJ to again look at your PQR's with this information. The
each of the PQR's (GTAW & SMAW) is welded with single process only or there
are multiple processes. In case of multiple processes, the t and T will be
different.

Best regards,

Prasad

"John Henning"
<jhenning@deltak.
com> To
Sent by: <materials-welding@googlegroups.com
materials-welding >
@googlegroups.com cc

Subject
25/02/09 08:41 PM [MW:1644] RE: 1638] Re: WPS from 2
PQRs

Please respond to
materials-welding
@googlegroups.com

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 1.5
mm 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

Save a tree...please don't print this e-mail unless you really need to.

Save a tree...please don't print this e-mail unless you really need to.

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---