Sometimes a third component occurs when the flux-cored electrode is a dual shield type electrode. This is the gas flow rate for the shielding gas. This varies for the size of the wire used, the size of the cup, and the wind conditions. On my 3G FCAW weldings certifications, I used about 30 CFH in a classroom setting. But other times, when welding in bad conditions, I have to go up to 60 CFH on the gas setting.