C02 welding?

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Hi, I am just curious about using co2 to weld steel.I am not to worried how clean it looks because I have A good sized tank out in the back I might as well use. Do you guys have any tips on using co2, The machine I will be using is a power mig 300. Thanks, Nick
Reply:Originally Posted by nick121Hi, I am just curious about using co2 to weld steel.I am not to worried how clean it looks because I have A good sized tank out in the back I might as well use. Do you guys have any tips on using co2, The machine I will be using is a power mig 300. Thanks, Nick
Reply:I use it most of the time.  The nozzle gets dirty faster so just clean it out when needed.  I also use a nozzle dip to help it clean up easy.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:You just bump the volts up a bit for CO2 vs 75/25.Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:From what I've found out CO2 doesn't work well on thin sheet metal. Something about not making a stable arc at low voltage (and just turning it up will burn holes in thin sheet).
Reply:Turn and burn. Expect slightly more penetration and more spatter stuck along your bead.
Reply:A dedicated CO 2 regulator maybe a wise investment. http://www.usaweld.com/CO2-Welding-F.../12020-co2.htm
Reply:Use CO2 for thicker steel.Don't worry about how it looks. It will be a lot cleaner than flux core.old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:I use CO2 all the time in my Millermatic 250. It welds good,but like said keep some nozzle dip handy. It costed me $38.00 last time to fill my CO2 tank and it lasts a lot longer then a tank of 75/25. Seems like CO2 welds better on dirty steel. Maybe because it penetrates better then 75/25.
Reply:Originally Posted by G-sonFrom what I've found out CO2 doesn't work well on thin sheet metal. Something about not making a stable arc at low voltage (and just turning it up will burn holes in thin sheet).
Reply:Originally Posted by WNY_TomB.my old millermatic 200 has a pulse feature that turns wire feed on and off automatically for thinner metal. never had a problem with sheetmetal but then again i would not be using .035 wire and co2 with sheetmetal all that much anyway
Reply:I pretty much strictly use CO2 with my small machine a Miller Multimatic 200. It penetrates more, and I find I can get almost as clean a weld as with using 75/25. This is my go to portable unit I take along for small jobs/repairs with a 20 cuft bottle or two, small, light, fast. I routinely weld thin sheet up to 3/8-1/2" and have no problems at all. Although it is a sweet machine and lays some nice beads being an inverter. And seeing as your using CO2, it's pretty damn cheap to use and lasts a long time. Oh, and don't worry about any fancy wire, just run standard ER70S6 hard wire. I'd say it's kind of like adding a few amps to your welder using straight CO2 over mix gas, the only drawback is that it can be a bit dirtier.RyanLast edited by xryan; 12-13-2015 at 01:32 AM.