Firstly, a trial or pre-WPS is just that – it is a starting point for developing your actual PQR. The trial WPS may be based on manufacturer recommendations, some information from other users, or past experience. During the performance of PQR welding, it is often the case that optimization will result in parameters that are not necessarily in agreement with the initial “guesses” made at welding parameters. What, then, is the value of such a document? Note that your PQR welding is not tied to this document or any other per Code.
Secondly, if the PQR is used to support more than one actual WPS are you going to report each use on the PQR?
The fact is still this is a CHOICE by the originator of the PQR/WPS. It is NOT a Code requirement, as many on this group seem to think. There is no basis for demanding this from a fabricator or supplier.
In my opinion this is simply a waste of time, results in excess paper retention, and serves no purpose. No PQR I have developed over the past 30 years has incorporated this information. To boot, ASME Section IX agrees with this point view based on the interpretation attached by another respondent to this thread.
PS – the only “justice” your PQR needs is acceptable test results. IF your test results (Code and any additional) are good, your PQR parameters have been justified.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Nazrulla Khan
Sent: Tuesday, July 16, 2013 8:02 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:18203] RE: 18127] What will be reference WPS no. in PQR( Preliminary WPS or New WPS)
Sir,
In my opinion
The WPS might not be code requirement, but as we mention as "REFERENCE WPS" used in PQR, mentioning ABC-WPS-001, Rev-0 will give justice to the words.
Regards
Naz
On Thu, Jul 11, 2013 at 6:08 PM, John Henning <jhenning@deltak.com> wrote:
WPS reference is not a Code requirement (neither pre-WPS nor final WPS). It is strictly optional, if you choose to do it. If you so choose, it is your option to enter whatever you prefer or your quality system requires.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Mhaskar Aly
Sent: Wednesday, July 10, 2013 11:17 PM
To: materials-welding@googlegroups.com
Cc: raj_muntazir@rediffmail.com
Subject: [MW:18127] What will be reference WPS no. in PQR( Preliminary WPS or New WPS)
Dear Friends
Kindly respond to my below query
To qualify a welding procedure we make Preliminary WPS (Suppose no. is ABC-PWPS-001, Rev-0) where we mentioning parameters ranges to be followed to qualify welding procedure (Weld metal thickness for each process, thickness of base metal, , Preheating temp, Inter pass temp, Position, backing etc),
As per procedure we qualify procedure (ABC-PQR-001) in PQR, whereas while final signing of WPS & PQR we make new WPS (ABC-WPS-001, Rev-0) with latest date (date same PQR date) where we show qualified ranges for above parameters…
My Question is; in PQR, what will be reference WPS no. (Preliminary WPS or New WPS)
Kindly put some light on this, what is the practice being followed in industries.
Ali Mhaskar
UAE
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