Monday, July 2, 2012

Re: [MW:14744] Impact test qualification requirement for WPS/PQR

Mr.  Azad Asmi.

Pl. refer to your query:

"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."

QW 200.4 - combination of welding procedures says (in short)

a. Processes, filler metals, or other essential or supplementary variables  is used in a joint QW 451  
    shall be used of the range to determine 
of base metal thickness for each process, filler metal or set
    of variables and those limits shall be observed. Alternatively qualification of  of WPSs for root
    deposits only made in accordance with QW 200.4(b).

b. QW 200.4 (b) says a PQR  for a
process  recording a test coupon that was at least 13 mm
    thick. and combined  with one or more other PQRs recording 
another welding process and any
    greater base metal thickness up to 2t.


Since your SMAW weld deposit is only 8 mm thick. it can not be used for your 21 mm weld thick in a 65 mm thick material weld.

If you have any queries on above , pl. let us know.

sridhar.
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From: rahul m <rahulmenator@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 2 July 2012 2:15 PM
Subject: Re: [MW:14738] Impact test qualification requirement for WPS/PQR

 SA 387 GR 12 CL2, 65 THK. MDMT is   -18 DEG CELCIUS how to make PQR for this thickness ? or  how many PQR required for this thickness?

On Wed, Mar 14, 2012 at 2:31 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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