Saturday, October 9, 2010

Re: [MW:7469] Duplex 2205 welding - High ferrite

Not 100 percent but 2 percent nitrogen with argon is recomended to achiev e about 40 percent ferrite in duplex weld
Regards
Hegde

Sent from my BlackBerry® smartphone from !DEA


From: Sridharan Chandran <sridharan.chandran@gmail.com>
Sender: materials-welding@googlegroups.com
Date: Sat, 9 Oct 2010 13:57:14 +0800
To: <materials-welding@googlegroups.com>
ReplyTo: materials-welding@googlegroups.com
Subject: Re: [MW:7465] Duplex 2205 welding - High ferrite

Srini,
 
I would suggest 100% Nitrogen as back purging gas to achieve reduced root ferrite i.e. witihin acceptable limits.
 
Sridharan
Welding & Metallurgy - Consultant Engineer, Perth

On 9 October 2010 00:05, Srini <sethu.srini@gmail.com> wrote:
Hello, Need some help here.

Pqr was developed with GMAW STT root and FCAW fill. Filler metals were
ER2209 and E2209T1-4.
Shielding gas Mison 2C (98+2Co2) for STT, Mison 25C (98+25Co2) for
FCAW. Impacts, Corrosion per A923 Method C passed. However when
metallographically tested for ferrite count per ASTM E562 we found the
ferrite content in root HAZ was as high as 69 - 70%. Typically we
would like to achieve 60 or 65% for better corrosion properties. Heat
input root pass= 25Kj/inch and fill passes=35Kj/inch. Backing gas was
100%Ar.

Any suggestions for reducing the ferrite content in HAZ of root is
welcome. Thanks in advance.

Srini

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