Thursday, July 5, 2012

RE: [MW:14769] Impact test qualification requirement for WPS/PQR

This is incorrect,  for PQR 2, QW-451.1 limits the maximum thickness of base metal and weld metal to 2T and 2t, respectively.  Therefore, PQR 2 is only qualified to a maximum of 20mm base metal thickness and 16mm SMAW weld metal thickness.  Since PQR 1 was impact tested at a higher temperature than required it is not applicable to welding on this combination of materials and required MDMT.

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of gogulu kumar
Sent: Wednesday, July 04, 2012 12:11 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14764] Impact test qualification requirement for WPS/PQR

 

Dear Asad Azmi,

 

PQR 2 can be used to deposit 21mm thick weld if other essential and supplementary essential variables are same as PQR 1, since "T limits impact" (QW-403.6) has limitation only on min. thickness qualified.

 

Regards

Gogulu Kumar 

 

On Wed, Mar 14, 2012 at 4:01 PM, asad azmi <azmiasadayub@gmail.com> wrote:

Dear All,

 

Greetings.

 

A vessel is being fabricated as per ASME SEC VIII DIV 1.

 

Vessel material is SA 387 GR 12 CL2, 65 THK. MDMT is   -18 DEG CELCIUS.

 

Approved WPS is supported by  2 PQR  detailed as below --

 

PQR 1

 

Test coupon thickness - 40 mm ,

Welding process used - GTAW + SMAW + SAW ,

Weld deposit by SMAW  Process is 19 mm.

Weld deposited by SMAW  is impact tested at   0 deg celcius.

 

PQR 2

 

Test coupon thickness - 10 mm ,

Welding process used - GTAW + SMAW ,

Weld deposit by SMAW  Process is 8 mm.

Weld deposited by SMAW  is impact tested at    - 18 deg celcius.

 

Whether  PQR  2 can be used for SMAW  Process to deposit  21 mm weld in a weld groove of 65 mm in depth .( for closing seam of shell to dished head & nozzle to dished  head weld seam)

 

Please advice. please give ASME SEC IX Reference.

 

Thanks & Regards

 

Asad Azmi

 

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--

Regards

Gogulu Kumar

+919765804701

 

 

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