Problem is, when you're using 25% argon/75% CO2, you're also releasing 3 times as much CO2 as you are argon. In a confined space, that CO2 will displace the available oxygen...THAT's where the need for ventilation comes into play, because it's the CO2 removed from the bloodstream via the lungs that the body expels, and the body seeks to replace that with oxygen-rich air....which it can't get in a CO2-rich atmosphere.
I'm not a doctor, and I don't play one on TV...but I have welded with Ar/CO2 mix.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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