Mixing Gas

Is it possible to mix your own C25 ( 75% argon, 25% CO2) using two tanks with a Y in your gas hose? I suppose you need a some kind of chamber to cause turbulence and ensuring proper mixing. The idea is to keep the minimum number of tanks while covering all MIG and TIG application.

Reply to
s-boulet
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"s-boulet" wrote in news:749Md.2968$P_ snipped-for-privacy@newscontent-01.sprint.ca:

Interesting idea. After all you can mix gas for oxy acety welding. Would it be possible to use a gastorch as a mixer? just an idea Henning

Reply to
henning wright

The way it is normally done is to fill a bottle with say 1500 psi of argon then add 500 psi of CO2. You now have a bottle of C25 with no mixers are required.

Mike Swift

Reply to
Mike Swift

Check the archives for this group; Ernie described a mixing set up not too long ago ...

Reply to
Andrew H. Wakefield

Just curious here, in a mix like this, does the argon keep the CO2 from becoming a liquid in the bottle? Also, you'd need to fill the CO2 first.

Shawn

Reply to
Shawn

This used to be standard practice for large shops, but the gas suppliers slowly converted everybody to buying mix gasses.

The REALLY big shops still do this.

CO2 is shipped at low pressure (300psi) as a liquid. Argon is shipped as a high pressure (2200psi) gas.

The gasses can be mixed at low pressure, but it is very difficult to get any kind of accuracy without expensive mixing setups.

The balance of Argon to CO2 is critical to arc perfomance in MIG welding.

I mix my own Argon and Helium, and I also mix Helium with my C25 for hotter steel MIG welds.

You do have to have back check valves on the lines to prevent cross contamination of your gas bottles.

Reply to
Ernie Leimkuhler

Large weld shops use bulk liquid co2 & liquid argon vessels connected to proportional gas mixers. Smith Equipment "Smithequipment.com" produces a few mixing setups.

Most weld production that use MIG robot cells use proportional gas mixers. Prices start about $1500US for standard 2 gas mixer @ 180SCFH.

See links below for more information.

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Reply to
Lance

--FWIW interesting things can happen when they get the mix wrong; I remember the time when International Rectifier was supposed to be using a mix that contained 10% hydrogen to clean a copper lead (pron: "leed") frame B4 it had things soldered to it. Turns out the mix was 90% hydrogen and there was a helluva bang.

Reply to
steamer

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