Watching a few videos on how to mig weld I noted the Americans nearly always seem to to use 75% argon and 25% CO2 yet we seem to use 95% argon and 5% CO2 is there a reason for that?
We like CO2....
AFAIK, CO2 being cheaper, we use more to reduce the more expensive argon.
Some people I know run 80/20, IIRC they are running solid wire spray mode.