100% CO2 Vs. 75/25 for vert up?

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Is it me or does it seem that using outershield wire with 100% co2 runs alot better with vert up then the 75/25 mix? I duno maybe not but it seems that the full co2 runs alot better with the vert up? What's your guys opinion?Ya gotta spend money to make money!
Reply:I've only ever welded outtershield with CO2, so can't compare the two gasses but it does run fine with CO2 in all positions.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Something to keep in mind when looking at gasses for fluxcore, is that the wire was designed to work with a particular gas, and a different gas will affect the transfer of alloying elements in the core to the puddle.  If the wire was designed for CO2 and you run it with 75%Ar/25%CO2, less alloying elements will be volatilized in the arc, resulting in a alloy rich weld metal that may have different strength properties than intended.  And the reverse is true also in using CO2 where 75/25 is called for.  This is probably only important in Code work, and critical applications where there are requirements on notch toughness, etc.
Reply:Yea i aggree With the type of wire. Were using Esab dualshield 7100. It says its ment for both types of gasses.Ya gotta spend money to make money!