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Tool Talk Discussion Forum

Re: MIG welding gas

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Stan in Oly, WA

10-22-2013 14:05:46

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The welding shop at the local community college went to straight CO2 for GMAW (MIG) several years ago, mainly on account of the substantial cost savings over the price of C25 (25% CO2, 75% Argon). C25 is nicer to weld with than straight CO2---less weld spatter, gentler arc, things like that, but not so much as to make it totally unpleasant to weld with CO2.

The reason pure CO2 is less pleasant than C25, in case you're interested, is because CO2 is a poorer conductor than Argon, so it takes more energy to overcome its resistance. If you've been using C25 for your gas shielded arc welding, and you enjoy it, you might find that using straight CO2 makes you just want to get the job done.


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Stick welding

10-22-2013 22:54:16

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 Re: MIG welding gas in reply to Stan in Oly, WA, 10-22-2013 14:05:46  
CO2 has more penetration than C25 but also has more spatter. If you have a dip tube cylinder, you'll have to have the dip tube removed and/or a new valve installed. C25 has a wider flatter bead and runs nicer. Also keep in mind CO2 is filled as a liquid and the cyl. pressure is much less than C25, 600 to 800 PSI max compared to 2000 to 2200 PSI.

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