Hello again Tommy, it's been a long day, I should have paid better attention to "all" of the posts leading up to the one of yours that I responded to. Gas-shielded flux-cored wires have been evolving immensely over the last X number of years. When I started out with gas-shielded, flux-cored welding, we were running straight CO2 with a flat/horizontal only wire designation, they didn't even have an all-position wire and didn't have an option for any other shielding gas as well.
Now, you might see straight CO2, 75/25(75%Ar, 25%CO2), and in some cases 90/10(90%AR, 10%CO2), and additionally, many of these wires might allow for running 75 to 90%Ar mixes with the balance of CO2 for the mix. The ASME and AWS designations, as well as others, possibly ABS, or CWB on the packaging, will spell out what shielding gases are required/allowed.
In some cases, there are additional designations(on the packaging) to include meeting Charpy testing values for instances where seismic applications are required. Everything is definitely getting a bit more complicated and figuring it all out generally takes some doing. Keep on reading and researching here on the forum, as well as other places, you'll get the hang of it and hang with the best of them. Best regards, Allan