shielding gas. It is well known that nickel and carbon are strong
austenite stabilizing elements. Therefore, the effect of CO2 increase
resulted in decreasing Creq and on the other hand, increasing of Nieq.
In addition to that, an increase of CO2 percentage in the gas in-
creases consumption of Cr, Si and Mn [22]. The amount of ferrite
percentage in the weld metal is calculated using the Creq and Nieq
using WRC-92 diagram and tabulated in Table 6. From Table 6 it
is clear that the measured ferrite percentage values are closer to
predicted ferrite percentage values.