Is it possible to mix your own C25 ( 75% argon, 25% CO2) using two tanks with a Y in your gas hose? I suppose you need a some kind of chamber to cause turbulence and ensuring proper mixing. The idea is to keep the minimum number of tanks while covering all MIG and TIG application.
The way it is normally done is to fill a bottle with say 1500 psi of argon then add 500 psi of CO2. You now have a bottle of C25 with no mixers are required.
Large weld shops use bulk liquid co2 & liquid argon vessels connected to proportional gas mixers. Smith Equipment "Smithequipment.com" produces a few mixing setups.
Most weld production that use MIG robot cells use proportional gas mixers. Prices start about $1500US for standard 2 gas mixer @ 180SCFH.
--FWIW interesting things can happen when they get the mix wrong; I remember the time when International Rectifier was supposed to be using a mix that contained 10% hydrogen to clean a copper lead (pron: "leed") frame B4 it had things soldered to it. Turns out the mix was 90% hydrogen and there was a helluva bang.
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