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Old January 6th, 2010, 03:45 PM   #1
Brods
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Default Mig shielding gas questions

What do you guys use for thin carbon steel, like body panels? Some guy on another forum was recommending straight CO2 to save money if running under 200 amps. Anyone using straight CO2?

Who has the best prices today? Airgas wanted $46 for 80cf of 75/25 Argon/CO2 mix. Seems high, but its been a couple years since Iíve bought any.
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Old January 6th, 2010, 03:51 PM   #2
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I use straight CO2 for all my MIG welding. Up here it's about half the price of mixed gas.
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Old January 6th, 2010, 05:42 PM   #3
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Straight CO2 will save you about half over C25 (75/25) but you will lose some penetration and get alot more spatter, if you are welding thin stuff and don't mind some extra cleanup you can save some coin going with CO2.
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Old January 6th, 2010, 06:30 PM   #4
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Thanks for the replies. Do you use the same regulator with co2 bottle?
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Old January 6th, 2010, 07:01 PM   #5
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You can use the same regulator, but you'll need to buy an adaptor. IIRC they are about $12
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Old January 7th, 2010, 05:14 AM   #6
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Jim if you need co2 let me know, I gots plenty.
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Old January 7th, 2010, 06:47 AM   #7
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I was wondering if you realized why they made the gas as a mix? as it was explained to me by my welding shop teacher its to make your weld flow better. it produced by his account a "wetter" looking weld. I use 80/20 on my Lincoln 255 here at home, we use 75/25 at work just because that a different supplier. if you were doing all tig I would recomend an all argon, but for mild steel in a mig I have always found the teachers was best at 80/20. I have my machine set up for aluminum as well but I don't keep any full argons here.
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Old January 7th, 2010, 02:08 PM   #8
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mixer
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Old January 7th, 2010, 07:19 PM   #9
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75/25 is about the best for mig welding.
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