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Monday, February 22, 2010

FW: [MW:4128] Preparation of WPS

 

Dear All,

 

The query posted by Gopu Nair, has generated some interesting discussions. If you analyze the scenario there are 2 issues, PQR was qualified  on EN10025 S355J2G3, steel , which  does not have any assigned P No or S-No, and  qualification code is Lloyds Register Rule for ship building (Not ASME Sec-IX) 

 

Over the years ASME has included quite a few non ASTM/ASME steels and assigned P Nos (Ref ASME Sec-IX-, page 108/109). As above steel is NOT included in ASME Sec-IX, it is considered as steel with unassigned P No.

 

As per QW-424, unassigned steel can be welded to unassigned steel, provided PQR is qualified as per ASME Sec-IX.  Under the present context  a s per the strict interpretation of ASME Sec-IX  this PQR (since it is qualified to LRS rules) could  not  be referred for an ASME WPS. If it is recorded in the PQR,  that testing was performed to LRS rules and ASME Sec-IX (cosmetic change) , it may be  very well referred for preparing WPS  to ASME Sec-IX  on  unassigned steel of  similar mechanical properties  to EN10025 S355J2G3.

 

It would be good to get others' viewpoints also.

 

Thanks.

 

Pradip Goswami,P.Eng

Senior Engineer/Specialist(Welding-Metallurgy)

Engineering & Training Services Division

ONTARIO POWER GENERATION Inc.

PO Box-2000, RR-55(South)

Nanticoke, Ontario,N0A1L0

Tel:-(519) 587-2201, Ext 3107--in Nanticoke

         (416) 231-4111, Ext 5925--in Kipling,Toronto

Fax: (519) 587-6814

Email-pradip.goswami@opg.com.

 

-----Original Message-----
From:
pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent:
Thursday, January 21, 2010 2:08 PM
To: GOSWAMI Pradip -THERMAL
Subject: FW: [MW:4122] Preparation of
WPS

 


 


From: bharatgole@hotmail.com
To:
materials-welding@googlegroups.com
Subject: RE: [MW:4122] Preparation of
WPS
Date: Thu,
21 Jan 2010 15:59:12 +0530

WPS  & PQR can be prepared as per ASME IX provided all essential variables for process GTAW & SMAW are meeting Section IX  article 3 requirements. Since this metal is not appearing in QW 422  so such unassigned metal shall be identified in WPS/ PQR by specification ,type , grade or by chemical & mechanical properties as per QW 424
Regards

Bharat B. Gole




Date: Thu, 21 Jan 2010 12:22:08 +0530
From: gopunair5343@yahoo.com
Subject: [MW:4117] Preparation of
WPS
To:
materials-welding@googlegroups.com

Dear All

 

Recently I have qualified a WPS on 20mm thick plate of EN10025 S355J2G3 using GTAW for root pass and SMAW for subsequent passes in accordance with Lloyds Register Rule for ship building.  The test piece has undergone Transverse tensile test (2), Side bends (4) Impact test (3 Sets)  at centre of the weld, fusion line and HAZ at -20deg.C, Macro and Hardness (1). PT and RT were carried out the test samples prior to drawing the destructive test samples.  all the tests are passed with the required values. Record of welding for each run is prepared and maintained.

 

consumable used are ER70-S2 and E-7018-1

Plate material properties are: Yield 357 N/MM2, UTS 541 N/MM2, El;  30% IMPACT at -20deg C; 53min, 81 Av.

C;0.18, Si: 0.35 Mn ;1.4, P    ;0.015, S : 0.002 Ce; 0.428

 

PQR as per the Lloyds rules is under preparation.

 

My question is whether I can prepare a WPS and PQR in accordance with ASME Sec. IX using the above records.

 

Regards

 

Gopu/CEPL

 

 

 

 


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