However in the "why change the way we have always done it" weld industry, the worst MIG gas that could be used, straight CO2 and the Argon - 25% CO2 were the MIG gas of choice for most in the weld industry for 25 plus years, and still used by many 6o years later. In the sixties, MIG gas research carried out by a few research facilities was revealing the influence of the MIG gas mix used, and especially the gas mix influence on the weld transfer mode capability, the weld parameter requirements for each weld mode, and the weld fusion and oxidation attained. Later as the MIG process focus was on welding steels and alloy steels, at first straight CO2 was widely utilized, and then for MIG Short Circuit weld spatter reduction, it was found adding argon to the CO2 was beneficial and unfortunately gas companies came up with Argon - 25% CO2 that reduced spatter but was not suited to most Spray welds. When the MIG weld process was first utilized commercially in the 1950s, it was primarily used for welding aluminum, so MIG weld gas selection was simple, order straight argon, unless extra aluminum weld energy was required, then order an argon - helium mix.
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