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Old 05-03-2013, 09:33 AM
Brian Martin,Freelance adviser
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CO2 is an "active" gas mixing with the weld while Argon is an "Inert" gas that doesn't and simply pushes impurities away. So by definition if you are using CO2 you don't have a "MIG" at all. I have only used the 75/25 doing auto body and fab work, other than the straight Argon we use on the MIG braze machine at work. From what I understand the CO2 welds hotter and more suited for hard core welding on fences and stuff that a pretty weld isn't needed and where you want more penetration.

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