Sorry RixTrix --- That is bad advice.
Pure argon will make a LOUSY MIG weld.... unless he's welding aluminum.
Not sure where you got your information... but it's just plain wrong. I'm not saying this to be mean - or to embarrass you personally... Many folks read these threads and bad information can lead to people doing things incorrectly.
To the OP (Original Poster) == stick to using 75/25 CO2/Argon mix for MIG welding. The pure argon will have lousy penetration - poor wetting - and undercutting.
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