Hi Saravanan,
Usually FCAW consumables for DSS are formulated to work with 100%CO2 and/Or with mixed gases, e.g 80:20, Ar+Co2 or 90:10 Ar+CO2. You need to check with consumable manufacturer. Shielding gas changes, weld metal properties, hence is an essential variable, calling for requalification of PQR.
Usually 100%Co2 shielding will have lesser notch toughness in weld metal than with Ar+CO2 shielding. This is due to more oxygen in the weld.
The ideal shielding gas will be Ar+Co2, for the optimum properties.
See this attachment page 12-14.
Thanks
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Saravanan Sornam
Sent: Sunday, December 15, 2013 5:51 AM
To: materials-welding@googlegroups.com
Subject: [MW:19600] Duplex UNS 31803 - FCAW Shielding Gas
Dear Welding Experts ,
Could you please share quite urgently that,Awaiting for your reply.
Thanks and Regards,
Saravanan,
Korea.
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