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Thread: How much weld time from 1lb of CO2 ?

  1. #1
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    How much weld time from 1lb of CO2 ?

    Came into some surplus CO2 and was thinking of using a one or two lb tank as a portable gas source when doing small mig jobs(mild steel) rather than dragging a 80, of 120 cf bottle of 75/25 with me. Just wondering how much weld time I could get with a pound or two of CO2 ?

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    Re: How much weld time from 1lb of CO2 ?

    1 pound is about 8.7 cubic feet. So maybe about 20 minutes at a flow rate of about 20 CFH.
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    Re: How much weld time from 1lb of CO2 ?

    About a year ago I bought a large paitball cylinder (24oz?) along with the bottle adapter. I screwed the adapter into my flow gauge then just twist the cylinder on when I am ready to use. My field welding is generally a few beads here and there. A second bottle would be nice. If I have a lot of welding I bring along a 20 pound borttle to refill with. I made a little bracket on the back of my feeder to hold it. It works well. It has saved me a lot in damaged gauges from nocking over the bottle, and is very convenient to move around with the feeder.
    Miller had a similar built in system on their passport.

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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by Oldendum View Post
    1 pound is about 8.7 cubic feet. So maybe about 20 minutes at a flow rate of about 20 CFH.
    Thanks, I would be happy if I got a real 15 minutes out of a 1lb cylinder. I have 5 - 1lb. cylinders for a soda machine because we could never find any exchanges that had them in stock. So I bought a 20lb CO2 and a filling adapter.



    Quote Originally Posted by walker View Post
    About a year ago I bought a large paitball cylinder (24oz?) along with the bottle adapter. I screwed the adapter into my flow gauge then just twist the cylinder on when I am ready to use. My field welding is generally a few beads here and there. A second bottle would be nice. If I have a lot of welding I bring along a 20 pound borttle to refill with. I made a little bracket on the back of my feeder to hold it. It works well. It has saved me a lot in damaged gauges from nocking over the bottle, and is very convenient to move around with the feeder.
    Miller had a similar built in system on their passport.
    I was thinking of doing something similar with my 210mp, clamping the cylinder to the machine. Would be easier than dragging a 60cf or a full 20lb bottle which is awkward, and also with regulator being vulnerable . Wouldn't be for any major welding, but for jobs up 4 flights of stairs, to put in 16" of weld.

    It reminds me of my first mig welder, which was a 115v Italian wire feed with a CO2 cartridge.

    I'll have to keep my eyes open for paint ball tanks, wouldn't hurt have a slightly larger tank. Just last week I passed an aluminum cylinder on the side of the road(garbage night), looked like a 5 or 10 lb CO2, by the time I got back it was gone. So I went to find a small regulator to go from he sodastream tank to gas line, and it just happens to be commonly used for charging small kegs of beer in refrigerators. Who Knew ? Thanks amazon.

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    Re: How much weld time from 1lb of CO2 ?

    Hobart used to have a kit with a 20 oz. tank and a fixed-flow requlator. Ads said approximately 40 minutes weld time. Flow rate may have been 25 cfh.

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    Re: How much weld time from 1lb of CO2 ?

    The 5-lbs cylinders are popular with people that keep beer kegs at home. In New Jersey (yeah it sucks) many liquor stores will refill them for maybe $10. Or any welding/gas vendor will swap out for less. You can do a lot of welding on 5lbs.

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    Re: How much weld time from 1lb of CO2 ?

    I would use flux cord
    Next use a longer hose on handcart.
    There still stick welding too.

    The down side to small tanks is cost. When had my shop I had 60LB tanks to keep the cost down with long hose in shop and in field stick welding.

    Dave

    Quote Originally Posted by albrightree View Post
    Came into some surplus CO2 and was thinking of using a one or two lb tank as a portable gas source when doing small mig jobs(mild steel) rather than dragging a 80, of 120 cf bottle of 75/25 with me. Just wondering how much weld time I could get with a pound or two of CO2 ?

    Thanks

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    Re: How much weld time from 1lb of CO2 ?

    The 5 lb cylinder would seem to me to be the sweet spot: 5.25 inches in diameter and 18 inches tall. That should easily get you 90 mins of arc time.
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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by Louie1961 View Post
    The 5 lb cylinder would seem to me to be the sweet spot: 5.25 inches in diameter and 18 inches tall. That should easily get you 90 mins of arc time.
    I have retired my C25 cylinder to Argon... I can run MIG all day long on CO2...really not much difference.. IMHO. Get a CO2 adapter for your flow meter and live a happy MIG life ever after.

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    Re: How much weld time from 1lb of CO2 ?

    One pound of CO2 has 8.74 cf
    So if 8 cf per hour about 1 hour.

    https://science.blurtit.com/205175/h...-of-liquid-co2

    Dave




    Quote Originally Posted by albrightree View Post
    Came into some surplus CO2 and was thinking of using a one or two lb tank as a portable gas source when doing small mig jobs(mild steel) rather than dragging a 80, of 120 cf bottle of 75/25 with me. Just wondering how much weld time I could get with a pound or two of CO2 ?

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    Re: How much weld time from 1lb of CO2 ?

    I would go with a 5 lb cylinder, decent weld time and not too big/heavy in my opinion. Should vaporize approx 40 cf from 5 pounds so a couple hours of weld time. I get a 1 pound is very portable especially just for quick welds, but might be more useful having a slightly larger tank. Just my 2 cents

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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by smithdoor View Post
    One pound of CO2 has 8.74 cf
    So if 8 cf per hour about 1 hour.

    https://science.blurtit.com/205175/h...-of-liquid-co2

    Dave
    The math certainly works out. But a MIG nozzle that would be satisfied with only 8 CFH flowrate would likely provide very little gas coverage at the actual weld puddle. Would be like what a #4-#5 TIG cup uses.

    Quote Originally Posted by nick121 View Post
    but might be more useful having a slightly larger tank. Just my 2 cents
    I agree. A 20lb tank of CO2 is tiny! I thought weldors were tough and rugged and didn't mind using force! 1lb tanks? Afraid to get your dresses dirty too?
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    Re: How much weld time from 1lb of CO2 ?

    It would be best to use 20 to 30 cf per hour. 8 is being very little gas
    I would be better to 24 cf would be 20 minutes.

    When I use gas for welding like 40 to 60 cf per hour but I weld outside.

    It would better to E71T-11 or E71T-GS and forget the gas.

    Dave

    Quote Originally Posted by Oscar View Post
    The math certainly works out. But a MIG nozzle that would be satisfied with only 8 CFH flowrate would likely provide very little gas coverage at the actual weld puddle. Would be like what a #4-#5 TIG cup uses.



    I agree. A 20lb tank of CO2 is tiny! I thought weldors were tough and rugged and didn't mind using force! 1lb tanks? Afraid to get your dresses dirty too?

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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by Billdacat View Post
    I have retired my C25 cylinder to Argon... I can run MIG all day long on CO2...really not much difference.. IMHO. Get a CO2 adapter for your flow meter and live a happy MIG life ever after.
    Yep, I use co2 almost exclusively as well. I use the 20lb tanks but also have a 5 pounder.

    I've even welded car body panels with 0.035" wire and co2. Welds just fine
    (the 0.035 was already in the machine, just left it)

    Added bonus, the duty cycle on a mig gun is at it's highest with straight co2.
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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by MinnesotaDave View Post
    Yep, I use co2 almost exclusively as well. I use the 20lb tanks but also have a 5 pounder.

    I've even welded car body panels with 0.035" wire and co2. Welds just fine
    (the 0.035 was already in the machine, just left it)

    Added bonus, the duty cycle on a mig gun is at it's highest with straight co2.





    Cool!!!!!

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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by ronsii View Post
    [/COLOR]
    Cool!!!!!
    You will find is CO2 is use is Ag/farm equipment, Furniture, Fencing any where they having to keep the cost down.

    The places that like mix gas is Machine Shops, Repair Shops, and any where low production with high cost labor.
    Code work requiring may require mix gas too.

    Dave

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    Re: How much weld time from 1lb of CO2 ?

    I have plenty of bottles of Argon, and AR/CO2. I traded in my 60 cf argon/CO2 back to straight argon again to do portable aluminum spoolgun welding. My other 2 bottles are 300cf Argon, and AR/CO2 mix at the home shop. I figured the 20 lb CO2 would be the back up or portable tank for mobile jobs. The real question was about using the soda stream 1lb tanks as I have more than I need now that I can reload at home now. I figured it might be handy for small jobs like welding a fender back on, or fixing a dock plate , or walk over platform at work quickly . Most small repair jobs are about an hour of fit-up to 10 minutes of welding. So I think a re-fillable 1lb would come in handy. Trust me, I've done my share of lifting 300 cf cylinders onto scissor lifts, and hooking together 12ft, and 25 ft hoses together to reach a weld job on top of a tank 40 ft in the air. Never been afraid of hard work or getting dirty, done plenty of both. Just why waste time and energy if its unnecessary. Now I need to find a regulator for the CO2 that fits the welder, all my regulators are CGA580,and I think the CO2 is a CGA320 .I will need to check. I will also need a small kegulator for the 1lb CO2 cartridge .

    I wonder if the CO2 will work with the dual shield I already have ?
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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by albrightree View Post

    I wonder if the CO2 will work with the dual shield I already have ?
    Most likely. Check the class.
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    Re: How much weld time from 1lb of CO2 ?

    I'm all about working smart too, The little bottles would probably work out ok for that, especially if you can bring a few with you. If you were buying new ones that's where I'd think the 5 pound would be useful to get more weld time and still light weight.
    As for the regulator, I use a regular one with a cga 580 to cga 320 adapter

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    Re: How much weld time from 1lb of CO2 ?

    Here's the wire.

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    Blue Demon doesn't list gas mixtures or flow ratings on their website like lincoln , hobart, and ESAB.

    https://weldingmaterialsales.com/cat...71t-1-1m-plus/

    this another application paper I found on the web(New Zealand?), says maximized for mix. At least they show CTWD .

    https://www.globalweldingsupplies.co...DF/MWMF_BD.pdf

    I'm guessing that the "M" is for mixed gas, and the "C" 100% CO2. So I think it should be fine. I read something about using CO2 would have a slightly lower tensile strength, but I don't think enough for me to worry when welding bollards, and plow frames.

    Just ordered the 580 to 320 adapter from Mcmaster, will order the little one from amazon. If the one lb doesn't work out , I can always use it to carbonate something (water, cider, beer).

    Happy Election Day !
    Last edited by albrightree; 2 Weeks Ago at 12:45 PM.
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    Re: How much weld time from 1lb of CO2 ?

    make sure you use the washer with the adapter.


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    Re: How much weld time from 1lb of CO2 ?

    The small gray tank in this photo is a 20 pound CO2 I believe. I got it from a business that services fire extinguishers $100 Cdn (about $75 USD) filled.




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    Re: How much weld time from 1lb of CO2 ?

    Quote Originally Posted by Broccoli1 View Post
    make sure you use the washer with the adapter.


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    Funny that you mention this, I didn't notice the gasket when I first hooked up my tank to my filling adapter. Didn't know the CGA320 fitting had a gasket, unlike the CGA580. When I flipped the tank to fill the smaller cylinders and cracked open the main valve, I had a frosty little leak.
    Found the gasket in the mailer later on.
    https://www.weldingweb.com/images/smilies/laughing.gif

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    Re: How much weld time from 1lb of CO2 ?



    I have a few extra and used a bread bag twisty to tie them to the handle on my welder.
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  31. #25
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    Re: How much weld time from 1lb of CO2 ?

    I bought a couple of extra also and put them "in a safe place".

    I hope I come across them before I actually need it.


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