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

Email-pradip.goswami@opg.com.

 
 

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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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