Co2 and welding.

[desertsport]

When welding with pure c02, not mixed. Is it compressed gas or liquid co2. Just curious if you could use a power tank, or would I have to get a seperate tank for the two.

[HalfFastFord]

I would guess that you could use it with the appropriate regulator.

[desertsport]

Well I have the regulater that came with my hobart, but I dont know if that will work or just freeze???

[Brad]

AFAIK, A C02 tank is a co2 tank is a co2 tank. Shouldnt have a problem using your regulator with your bottle. The regulator will get cold if you flow a lot through it but Ive never had one freeze up.

[Pavemen]

you want to use the gas, not the liquid,so a powertank setup will work as longas you can get the regulator to work. there is an adapter that will let you use the ar type reg with the welder on the co tank valve

[desertsport]

Thanks for the help.

[sixty]

Whenever Co2 is commpressed it turns to liquid. all Co2 tank have liquid in them when full. If you turh the tank upside down you will get liquid co2 out instead of gas

A Power Tank will work just as well as any Co2 tank. it should have the standard Co2 valve on the top that you will have to buy an adapter to fit your Hobart regulator. Just about every welding shop should carry these for about $10-$15.

[desertsport]

Is it like that with other gases, like acetelyne and oxy?????

[Wicked_S10]

Is it like that with other gases, like acetelyne and oxy?????

No, and as for CO2, you can get tanks that draw from the bottom for liquid CO2, we have lots of them at work for making dry ice. Probably 99% of the CO2 tanks out there are top draw though, so it is not that big of an issue unless you find an old tank somewheres and dont know what it is.

**edit** BTW, even though there is no liquid acetelyne in an acetelyne tank, you should still never lay the tank down and use it. And if you do have to lay it down for transport, it should stand verticle for at least 15 minutes before use. The reason is that there is liquid acetone in the bottom of the tank, dont ask me why they put it there, but my guess is some type of dessicant for the gas.

[kf4zht]

No, and as for CO2, you can get tanks that draw from the bottom for liquid CO2, we have lots of them at work for making dry ice. Probably 99% of the CO2 tanks out there are top draw though, so it is not that big of an issue unless you find an old tank somewheres and dont know what it is.

**edit** BTW, even though there is no liquid acetelyne in an acetelyne tank, you should still never lay the tank down and use it. And if you do have to lay it down for transport, it should stand verticle for at least 15 minutes before use. The reason is that there is liquid acetone in the bottom of the tank, dont ask me why they put it there, but my guess is some type of dessicant for the gas.

The acetone keeps the acetelyne stable.

[76Cruiser]

They also have a bunch of little balls or somesuch in them. Keeps the acetylene from going :nuke:.

[pepe]

Its more like an morter or concrete that fills the bottle and is poreous enough to store the gas.

Welding Co2 is different than other Co2 in that there is a dryness requirement. Moisture is bad for welds (ie hydrogen) But I dont know if regular Co2 would work in a pinch.

[welderdude]

Whats gas? whats liquid?
Man, Co2 is much cheaper these days. Than mix
I too have cut an aceteline bottle open. Gray stuff that burns most all of the night.
Dont loose the little white washer for yer flow meter.
Good on ya'

[PTSchram]

**edit** BTW, even though there is no liquid acetelyne in an acetelyne tank, you should still never lay the tank down and use it. And if you do have to lay it down for transport, it should stand verticle for at least 15 minutes before use. The reason is that there is liquid acetone in the bottom of the tank, dont ask me why they put it there, but my guess is some type of dessicant for the gas.

The chemistry is surprisingly complex and I don't feel like trying to describe it here and now. Basically, the Acetone dissociates to acetylene.

Don't worry about laying tanks down, stand them up and let them sit for as long as they were laying down and you'll be fine.

[Lewdo]

The chemistry is surprisingly complex and I don't feel like trying to describe it here and now. Basically, the Acetone dissociates to acetylene.

Don't worry about laying tanks down, stand them up and let them sit for as long as they were laying down and you'll be fine.

What? The chemistry is actually very simple. Acetone is a solvent in this case. Its purpose in the tank is to prevent explosion. Acetylene (the simplest alkyne) readily dissolves in acetone, however gaseous O2 does not. Therefore, the dissolved gaseous acetylene in cylinders does not decompose by O2 (explode).

[Al Kaholick]

Acetylene is explosive at some pressure, i dont remember exactly what but I think its around 30 PSI, in the tank the acetylene is absorbed into the acetone to make it safer

No, and as for CO2, you can get tanks that draw from the bottom for liquid CO2, we have lots of them at work for making dry ice. Probably 99% of the CO2 tanks out there are top draw though, so it is not that big of an issue unless you find an old tank somewheres and dont know what it is.

**edit** BTW, even though there is no liquid acetelyne in an acetelyne tank, you should still never lay the tank down and use it. And if you do have to lay it down for transport, it should stand verticle for at least 15 minutes before use. The reason is that there is liquid acetone in the bottom of the tank, dont ask me why they put it there, but my guess is some type of dessicant for the gas.

[DpSyChO]

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[kf4amu]

I just got that exact adapter from a local welding shop for 10.95.

I have a large Co2 tank from a drink machine that has 1000 psi left in it. I plan on using the Co2 out of it, then filling it up with mix and my small tank, which I currently use, for straight argon.