[MW:1342] Re: 1334] WPS combination of two PQRs

Please find the RED colour statemets between the lines.

 

Regards

 

On 11/24/08, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

Pl see below and read care fully in between the lines

You need to check qualification range for T (base metal thickness) t (deposited metal thickness)

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From: Sukamal Naskar [mailto:sukamalbecmet@gmail.com]
Sent: Monday, November 24, 2008 1:45 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: Re: [MW:1336] RE: 1334] WPS combination of two PQRs

 

Thanks for your reply.

 But, QW-403.5   states that " .......... If, however , two or more qualification records have the same essential and supplementary essential variables, except that the base metals are assigned to different group numbers within the same P-Number, then the combination of base metals is also qualified."

It should have same essential and supplementary essential variables, one is GTAW and the other is SMAW, hence combination can be used only GTAW and not for GT+SM

    Yes, In this case we are combining two welding processes for the single WPS. while we are combining these two PQRs, how come the combination will be only one process ? if this is the situation, then for a combination process, we always have to qualify the PQR in combination of that process, we can't combine the PQRs of different process, which code dosn't say.

 

 

Also QW-403.6 states only for the lower limit of the base metal thickness if impact required, and in this case for the 8mm thick plate it qualifies from 8mm to 16mm (QW-403.6 & QW-451.1) & for 10 mm it will qualify 10mm to 20mm.( QW-403.6 & QW-451.1). So if we combine both the PQRs, then why not the base metal thickness range from 8mm to 20 mm?

Here you need to check the limits for T and t separately; QW 403.6 does n't states about t,

   Yes, Now I am talking about the Base metal thickness range (T), for this one the combination process base metal thickness (T) will be 8mm to 20mm. and deposited weld metal thickness (t) for GTAW process will be 16mm max. and for SMAW process 20 mm max. ( Ref:-QW-401.3)

For e.g. even if ur depositing only root with GTAW you can't deposit it on a 20mm plate.

 

   For , GTAW process , the deposited weld metal thickness will be 16 mm max.

QW-200.2(f), has given one example for combination of two PQRs to get the base metal thickness ranges, can it be followed?

 It also states about supplementary essential variable is n't it?

 

   This is a general statement.

 

On 11/24/08, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

QW403.5 and 403.6

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From: Sukamal Naskar [mailto:sukamalbecmet@gmail.com]
Sent: Monday, November 24, 2008 1:19 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:1336] RE: 1334] WPS combination of two PQRs

 Thanks for your responce.

 Can you please let me know according to which clause of ASME Sec-IX, the base material thickness is 10mm to 16mm with impact . why not 8mm to 20mm ( combination of two PQRs)

 Regards

 On 11/24/08, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

With impact testing

Any material combination can be welded within range of 10-16mm base metal thickness

Sorry, There was a mistake here P1G1 can't be welded using SMAW process

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
Sent: Monday, November 24, 2008 1:06 PM
To: materials-welding@googlegroups.com
Subject: [MW:1336] RE: 1334] WPS combination of two PQRs

 

Without impact testing

1.5 to 16mm base metal thickness can be welded.

With impact testing

Any material combination can be welded within range of 10-16mm base metal thickness

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sukamal Naskar
Sent: Monday, November 24, 2008 11:36 AM
To: materials-welding@googlegroups.com
Subject: [MW:1334] WPS combination of two PQRs

 Friends,

Good afternoon. I need one help regarding one WPS, combination of two PQRs.
the 1st PQR is 8mm thick, with base material SA 516Gr.70 ( P No.1 Gr. 2) with SA 516 Gr.65 (P No.1 Gr.1). welded with full GTAW process , and is impact tested at -29 deg. C.

2nd PQR is 10mm thick, with base material SA 516Gr.70 ( P No.1 Gr. 2) with SA 516 Gr.70 (P No.1 Gr.2). welded with full SMAW process , and is impact tested at -29 deg. C.

If we combine these two PQRs to make one WPS for the combination welding process GTAW & SMAW, will the base material thickness range will be 8 mm to 20mm ( with impact) and 1.5 mm to 20mm (without impact) ?

The deposited weld metal thickness for GTAW will be 16 mm max. and SMAW 20mm max. ( for both with / without impact)

And if the impact test is required at - 29 deg. C, can we use this WPS for all possible base material combinations ( P1 Gr.1 to P1Gr.1; P1 Gr2 to P1 Gr2 and P1 Gr.1 to P1 Gr.2) ??

 Regards

Sukamal Naskar
MMHE ATB
+60177007205
Malaysia

  

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