Materials & Welding: Re: Re: [MW:28601] Combined PQR

Thursday, November 8, 2018

Re: Re: [MW:28601] Combined PQR

Hi just to be sure we are not diverting away from the topic.

The question was "whether separate WPS's can be written from a multi process PQR."

ASME is very clear when it comes to deriving processes separately in a WPS from a multi process PQR.

However if you refer AWS D1.1, nothing is stated with respect to the same. When it is not stated, then it cannot be followed.

On Thu, Nov 8, 2018 at 10:41 AM Ramesh <rameshkannandevaraj@gmail.com> wrote:

Hi

If you see both ASME (QW-200.4) & AWS (Clause 3.6.1) on combination of weld procedures , both code does not talk about PQRs. Only the final WPS ( Each WPS may include
one or a combination of processes, filler metals, or other variables. )

Ø AWS provide is simple explanation in this regard than ASME

Ø Both codes does not talk about separation of PQRs ( combination is important than separation)

Combination of WPS/ PQRs may NOT be already welded earlier, but separation is done for the already welded process, it is not important criteria, I believe)

(Under ) QW-200.2 – ASME

(Under pre-qualified) C-3.7 General WPS Requirements - AWS

In summary, Both codes have intention to combine WPS/PQR provided all the essential variables for each process is meeting the limitations specified which results successful production welds either with combination or Separation.
Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Tue, Nov 6, 2018 at 12:23 PM muneebslsa@gmail.com <muneebslsa@gmail.com> wrote:

When it said ''A combination of qualified and prequalified WPSs may be used without qualification of combination'' it means it is very clear that the combination of multiple qualified or pre qualified WPSs can be used if the limitation of essential variables applicable to each process is observed.

So PQR has nothing to do here.

But whether AWS D1.1 allows Multiple WPSs With One PQR/Multiple PQRs With One WPS?

Regards,
Muneeb.M

From: Ramesh
Date: 2018-11-02 09:12
To: materials-welding
Subject: Re: [MW:28554] Combined PQR
Hi Nithin,

i am unable to find the word " independent PQR's may be combined " in above clause

i presume, this clause does not say about PQRs, Only your final WPS ( which may have single supporting PQRs or process or combined PQRs or process)

These qualified WPSs can be combined without combination and within limitations of each process ( refer last two para carefully )

i understand from response that, suppose if an PQR have with combination process ( Ex.TIG+SMAW) , u are interpreting that preparing Two separate WPS ( one for TIG & one for SMAW) is not allowed as per D1.1. right ?

or, Pl explain your interpretation of above 3.6.1 clause.

Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Fri, Nov 2, 2018 at 10:30 AM Nithin Joseph <nithindsilva4u@gmail.com> wrote:
Dear Mr. Rameshkanna,

Note that clause 3.6.1 clearly states independent PQR's may be combined and does not state WPS's can be made from the combination PQR.

On Thu, Nov 1, 2018 at 7:54 AM Ramesh <rameshkannandevaraj@gmail.com> wrote:
Hi
shakin thobias

1. Please refer AWS D1.1 , Part C for performance qualification requirements.

Range of qualifications - pl refer Table 4.10 & 4.11

2. Combination of WPS is allowed as per 3.6.1 This is applicable for both qualified or prequalified WPS.[ Screen shot from 2015 edition as below ]

Also refer OLD AWS interpretation as below [ 1984 edition]

Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Wed, Oct 31, 2018 at 10:06 AM Nithin Joseph <nithindsilva4u@gmail.com> wrote:
In AWS there is no provision of extracting a process. for eg, you are qualifying FCAW+SMAW, you have to use same combination on job too. Writing separate WPS for SMAW & FCAW is not acceptable as per AWSD1.1.

On Wed, Oct 24, 2018 at 2:11 PM shakin thobias <shakinthobias@gmail.com> wrote:
Dear experts

I need to qualify welders in Both FCAW and SMAW. can i do both qualification in same PQR. what are the parameters and range of qualification. qualify that welders to max 30 mm thickness range.

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