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MIG Welding Question RE: CO2 Gas

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MIG Welding Question RE: CO2 Gas

Old 08-28-2011, 06:21 AM
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Default MIG Welding Question RE: CO2 Gas

I am trying to learn how to weld and need some CO2. My brother loaned me his old 75amp Craftsman Mig and he had a bottle of argon, but I emptied it pretty quick. Through research about mig, wire, etc. I realized I would be better off with either a 75/25 argon/co2 mix or 100% co2. This is base on the wire I'm using and the application, which is automotive body panel replacement. So, when it comes to tanks it is a little confusing (still trying to figure this out) I guess there are owner tanks that you own, but then there are other tanks you can get that you don't really own. Filling non-owner tanks must be done through the company that owns them. Anyhow, I'm guessing that I can't fill the empty argon tank with co2, is that true? If so, I need to buy a co2 tank and get it filled. Will this have the same fitting or is it going to be different? I also want something that isn't a PIA to get filled. Tractor supply seems to be the closest source to where I live. I would have to buy a new tank, then trade it in for a full tank. The new tank is here: http://www.tractorsupply.com/hobart-...linder-3960217 and then it is about $25 to do the exchange. They also have a smaller kit that uses a paintball style co2 and it would be a bit cheaper: http://www.tractorsupply.com/welding...lding--1013447 but it appears that it has no valve, which means it may empty in between uses. Sorry for the long story here, but I need some advise on best way to do this without breaking the bank.
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Old 08-28-2011, 07:02 AM
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The Argon and co2 bottles are one and the same. Take your empty bottle to a welding supply company (wesco, airgas, etc...) and have them fill it with co2. They will just put a different identification sticker on it and off you go. Should be cheap.
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Old 08-28-2011, 07:10 AM
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The tanks are color coded. Argon co2 is a teal green with a silver top color. Argon is the green color.

You need a different regulator for pure co2.

Butch
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Old 08-28-2011, 07:21 AM
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Stargon; argon/co2 mix will give you a cleaner bead with less spatter. Best for what you are going to weld.
Sheet metal / body panals.
100% co2 will give you more penetration for heaver metals but will give more spatter.
Go to a welding shop and have them give you advice for the most economical way to buy the gas you need. Buy vs rent tank. I own my tanks so all I do is swap them for filled ones.
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Old 08-28-2011, 08:04 AM
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.023 wire and 75/25 . lots' of spot tacks every 4" then put 1 every 2" then 1 every 1" . I am only talking a second or so on the tack. to much heat in 1 spot on that thin of metal will warp it so bad you wil never get it right. Set the regulator at 25-35cfpm and weld out of the wind.
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Old 08-28-2011, 08:24 AM
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What docters oarders said....
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Old 08-28-2011, 10:40 AM
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Thanks all. I did get the .023 wire, because I was using .030 and someone else said the same thing about going smaller. So if I understand correctly, I should be able to take the tank I have and have it filled with stargon (75/25) mix. Do they know whether it is my tank or not? What do they look for, because it just looks like a regular tank to me.
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Old 08-28-2011, 08:22 PM
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Take it to a welding supply place...they generally swap tanks...I got mine for $30....75/25..
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Old 08-28-2011, 08:58 PM
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How many cubic Ft. is your bottle? I have a small bottle (20 Cu ft.) and when I get it filled I wont swap. I make sure they fill MY tank. It's not as common as an 80 cu. ft. tank and sometimes they will try to cheat you on cu. ft. BTW, Ar/co2 mix is probably the way yu want to go. Maybe try a Argon, Helium, co2 mix.
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