Hi, You try to do GTAW welding without filler metal (Just with tungsten rod only) on the root side.It may help to reduce theferrite content significantly. Thanks & regards, (Karthik)
Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
--- On Tue, 10/12/10, srinivasan sethuraman <sethusrini1973@yahoo.com> wrote:
From: srinivasan sethuraman <sethusrini1973@yahoo.com>
Subject: Re: [MW:7507] Duplex 2205 welding - High ferrite
To: materials-welding@googlegroups.com
Date: Tuesday, October 12, 2010, 9:24 PM
| 10mm thick pipe welded in flat. Thanks
Srini
--- On Mon, 10/11/10, Vanchinath S.A. <vanchinaths@gmail.com> wrote:
From: Vanchinath S.A. <vanchinaths@gmail.com>
Subject: Re: [MW:7485] Duplex 2205 welding - High ferrite
To: materials-welding@googlegroups.com
Received: Monday, October 11, 2010, 9:03 AM
What was the thickness of weld joint? vanchi
On Fri, Oct 8, 2010 at 9:35 PM, 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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