mig w/100% argon

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seems to work..any reason why i shouldnt..out of the 75-25 and need this job done asap..tonite really...probly be done by the time its read on here but i still wanna know thanksgary
Reply:Depending on thicknesses/amperage - lack of penetration.
Reply:If you have a big enough machine (250 amps or more) you can crank it up and use pure argon in a pinch, though it is far from ideal.  With a small machine under 200 amps, good luck getting any penetration or wet-in.  Beveling and gapping the joint will help.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Mig with argon?Sure, on aluminum!http://esabna.com/us/en/education/kn...g-aluminum.cfmNot recommended from ANY welding reference or machine or filler maker for use on steel.  MIG on steel with the fillers requires a little bit of -some- oxidizer such as CO2 or O2.  The oxidizing gas affects the arc voltage and the arc stability and the total energy in the arc and the heat of the arc and the weld and the penetration profile of the weld.  And I probably missed listing a whole bunch of other reasons.Short circuit GMAW on steel using plain argon will most likely give a classical cold-lap aka lack of penetration aka lack of fusion aka Bad-weld-that-looks-OK.  Don't do it.    http://www.esabna.com/EUWeb/MIG_handbook/592mig4_1.htm  The best laid schemes ... Gang oft agley ...
Reply:It works on thin sheetmetal, but don't use it for anything structural.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.