Dear Mr.Pradip,
We are using LR type filler material .
I have read that these repairs are nothing but oxides and avoiding these is very difficult.
Is it true.
Regards,
Shashi Kumar
From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Tuesday, November 24, 2009 9:20 AM
To: materials-welding@googlegroups.com
Subject: FW: [MW:3719] Carpenter steel Alloy20 welding
Dear Mr. Shashi kumar,
I have attached the spec sheet of Alloy-20 for your reference.Usually this alloy is a fully austenitic alloy, so requires good cleanliness to ensure crack free(usually hot cracks) welds. Usually welding consumable should have low residuals ( S & P). E-320 and ER-320LR consumables are fine.
Usually this alloy does not require preheating, for barrier layer deposition on 4" thick flange preheating (100-150 deg C) is recommended. If this deposition is a multi layer deposition, 2nd layer onwards in the interpass should be controlled 150 deg C max. Clearing LPI is recommended for each pass of weld deposition.
Due to high nickel content the wetting behavior of this alloy can be a problem, hence proper bead overlap (40-50 %) would ensure a sound defect free weld deposit.
Looking at the problem, the defect looks to me as improper fusion or lack of interbead fusion. If you do a light grinding ,then improper fusion would be reveled, otherwise LPI would detect it.
Look forward to further feedback from your end.
Thanks
Pradip Goswami,P.Eng
Senior Engineer/Specialist(Welding-Metallurgy)
Machine Dynamics & Component Integrity Dept.
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
From: prodmlr@cicb-chemicon.com
To: materials-welding@googlegroups.com
Date: Mon, 23 Nov 2009 11:07:26 +0530
Subject: [MW:3712] Carpenter steel Alloy20 welding
Dear Gentlemen,
Is preheat of work piece required for Alloy20 overlay on P1 (100 thk Girth flange)
using ER-320LR and for welding of Alloy 20 plates.
I am Experiencing Lot of defects in welding of Alloy 20 plates SB 463 / 16 thk .
Defects are linear but are not actually slag.
What could they be???
Consumable used is E-320 and ER-320LR.
Will appreciate immediate response.
Regards,
Shashi kumar
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