Mig Co2/Argon gas flow rate?

I just installed a Mig conversion gas kit on my Lincoln Weld pac 100, nowhere does it specify in the manuals, the flow rate adjustment.Any info would be much appreciated. Thanks in advance........ Kevin

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20 CFH (Cubic Feet per Hour) is usually good unless there's a slight breeze. Then you'll want to increase it to 25 or maybe even 30 but if the breeze is that strong you won't have much luck anyway.

Best Regards, Keith Marshall snipped-for-privacy@progressivelogic.com

"I'm not grown up enough to be so old!"

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Keith Marshall

I use straight CO2 at 25CFH never had a problem, better penetration than mixed gas in my opinion , not as pretty but less than 1/4 of the cost and readily available .


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I bought a MillerMatic 200 in 1982. It came with a cheesy CO2 regulator which promptly froze up from hard us and I replaced it with a much better one.

I built ornamental metal with it for 12 years. I used CO2 totally, except for one tank of 75/25 when I heard how much better it worked. Well, it did work better, giving a smaller better looking bead, but not enough in my mind to justify the extra cost. At that time in my area, it was about four times as much as the CO2.

Fast forward 12 years. I bought a Lincoln 175SP+, and it came with a pretty decent Argon/CO2 regulator. I use mixed totally now. I don't use a lot of gas, and maybe if I were, I would go back to CO2. I know I can lay a stitch weld of spots with Argon/CO2 on .056" tube, and it looks just like a TIG weld. I use this at times where the weld will show, or I don't want to grind it all off.

They both work, I think it just depends on what you are welding, and how you want it to look when done. Do some side by side tests of both gases and decide for yourself. A/C is prettier. I think it runs hotter because 100% CO2 will cool the weld faster. I notice the finished beads with A/C are thinner than and smoother than CO2.



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