I tried 98% Argon/2% O2 for Spray Arc Transfer on steel it worked OK but with a little adjustment I got 75% Argon 25% co2 to work just fine, 80% Argon 20% Co2 I could not find any different for the price. I set the MTS250S to SYN Mig 24.0V 200A SYN to Steel and wire to .035 wire was S-6. And welded .375 plate to 1.5 X 1.5 bar. Good grinder is nice with different disc hard and soft.
Everlast PowerTig 325EXT (Canada)
Everlast Power I Mig 250 (Canada)
Everlast PowerPlasma 80S (Canada)
Everlast PowerCool W300 (Canada)
Everlast PowerMTS 250S Fitted with a 30A Spoolgun(Canada)
Miller Dynasty 400 wireless(Canada)
Millermatic 252 plus 30A Spoolgun(Canada)