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
-----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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