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
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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