Help with a inert gas tank

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I've got a tank that I was given, the guy who I got it from didn't know what was in it he thought that it was Argon but it doesn't have any stickers on it saying what gas it is. I know that it's definitely an inert gas by the valve on it, the tank is full and currently inspected for 3 more years. Any ideas on how to tell what gas is in it? I'm looking to use it to learn scratch start tig if it's an argon tank, could I get it retested for argon if it turns out to be nitrogen or something?"Firearms stand next in importance to the Constitution itself. They are the American people's Liberty, Teeth, and Keystone under Independence." - George Washington
Reply:Trial and error?I ran into the same problem just today.A cylinder with no info......I tought it was argon, so I hooked it to my spool gun for aluminum, not argon....So I hooked it to my plasma... Not nitrogen....So I called airgas (formally metroplex service weld supply), they told me that's an air liquide cylinder ( big three welding equipment on the neck). So I call air liquide, and he ask if there is a serial number on the cylinder, I say yes and tell him what it is, and he tells me it is 75/25 (argon/co2)He also told me it was leased to someone and I can't exchange it
Reply:Do you have a friend with a tig setup?Ian TannerKawasaki KX450 and many other fine tools
Reply:Originally Posted by fortyonethirtyDo you have a friend with a tig setup?
Reply:The valve will be marked with the intended gas service.Some where on the valve will be stamped CGA and 3 numbers.If it is CGA 580 it could be argon,nitrogen,helium or argon/CO2(or some other gases).If it is CGA 580 just see if your welding supply will swap it out.http://www.concoa.com/cgachart.html
Reply:Originally Posted by AMC724Trial and error?I ran into the same problem just today.A cylinder with no info......I tought it was argon, so I hooked it to my spool gun for aluminum, not argon....So I hooked it to my plasma... Not nitrogen....So I called airgas (formally metroplex service weld supply), they told me that's an air liquide cylinder ( big three welding equipment on the neck). So I call air liquide, and he ask if there is a serial number on the cylinder, I say yes and tell him what it is, and he tells me it is 75/25 (argon/co2)He also told me it was leased to someone and I can't exchange it
Reply:Originally Posted by bert the welderWell, if you bought it off someone privately....there's a reason cylinders are shaped like suppositories........
Reply:Well I tried it out and it turned out to be a C25 mix bottle, I took it to Airgas because that's where I do all my business with cylinders and they let me trade in a #4 for a 250 Argon for $37, they only charged me for a refill and I was super surprised.Last edited by Jeromy_E; 03-13-2013 at 04:39 AM."Firearms stand next in importance to the Constitution itself. They are the American people's Liberty, Teeth, and Keystone under Independence." - George Washington
Reply:Great! Sometimes the universe shines on you and gives you the right guy to talk to!200amp Air Liquide MIG, Hypertherm Plasma, Harris torches, Optrel helmet, Makita angle grinders, Pre-China Delta chop saw and belt sander, Miller leathers, shop made jigs etc, North- welders backpack.