Gas shield flux cored welding wire E71T-1C and E71T-1M

1) Can it only be used for CO2 gas protection or mixed gas protection (Ar 80%, CO2 20%)?

The E71T-1C welding wire currently produced can be used in both types,

E71T-1C welding wire,customers all use mixed gas welding, no problem.

2) Or both of the above are applicable? Which use results better?

CO2 gas results better and cheaper.

3) If both are applicable, what is the difference in welding parameters?

The low-temperature impact of the mixed gas is better, the mixed gas is -40 degrees Celsius, and the CO2 is -20 degrees Celsius. There is not much difference in welding parameters. At a voltage of about 30V, a suitable current is sufficient.