lewis635
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| posted on 18/5/05 at 09:47 PM |
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co2 gas
i managed to get hold of a pub co2 cylinder for my MIG welder but need a fitting to connect to small pipe on MIG set.
What have you all used or does anyone know what type of thread is on the tank. i cant get to the garage now but i think it is about 3/4 BSP or NPT. if
you lot can help i can raid the stores at work.
Thanks
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DarrenW
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| posted on 18/5/05 at 09:52 PM |
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The pub bottle my Dad has uses a flexirubber pipe from the bottle (jubilee clipped on) with an airline style push in fitting (the type used in
industrial applications, i dont mean the airline connector (PCL etc) as fitted to compressors - they look like smaller versions of the latest easy
plumbing fittings) on the other end. The white pipe from the welder justpushes into this.
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Peteff
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| posted on 18/5/05 at 10:45 PM |
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Do you mean the regulator tailpiece that takes the pipe from the reg to the welder? Can't definitely remember but I think it is 3/8 BSP fitting.
Get one of each to be sure or take your reg in to try one.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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carlgeldard
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 posted on 19/5/05 at 09:17 AM |
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I wouldn't use pub gases if I was you.
It has nitrigen in it and that causes porosity (Just like an aero chocolate bar full of little air holes) nett result weak welded joints.
Carl
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NS Dev
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| posted on 19/5/05 at 10:28 AM |
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you can still get straight CO2 if you go to the right place.
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lewis635
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| posted on 19/5/05 at 11:25 AM |
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Thanks guys. it is pure co2 i have.
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carlgeldard
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| posted on 19/5/05 at 11:41 AM |
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Yes you can get pure CO2, But BOC etc put nitrogen in the brewery bottles to stop you using them for welding.
Carl
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craig1410
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| posted on 19/5/05 at 11:54 AM |
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I have a pub gas bottle and it says that it is CO2 with no mention of Nitrogen. Surely they would have to label it if there was nitrogen in it?
Don't take this wrong but is this fact or hearsay? I only ask because I have welded my entire car using pub gas and never had any visible
problems, even after doing a few test welds and cutting the weld apart with a hacksaw for inspection. The only time I get porosity is when welding
outside and the wind blows the shield away...
Cheers,
Craig.
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Peteff
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| posted on 19/5/05 at 02:22 PM |
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The co2 they use for soft drinks is usually better than the one used for beer.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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carlgeldard
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| posted on 19/5/05 at 03:41 PM |
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I know this to be true as I buy a lot of gases from BOC & Enagas at work (Fabrication Shop) And I have worked with and have a good relationship
with the welding department and Wakefield Collage. I also had a problem some years ago with co2 from Clarks brewery, when I used to make gates and
fences etc using pub gas from there bottles. As all the gase come from the main people like BOC then I guess it would be the norm to put Nitrogen in
the pub gases.
Carl
I will phone BOC and check.
[Edited on 19/5/05 by carlgeldard]
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paulf
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| posted on 19/5/05 at 07:19 PM |
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I used to use pub gas and there are two types, either pure co2 or a mix with nitrogen. If I remember correctly the mixed gas is at a higher pressure
than pure co2 and uses a different regulator.
I now use fire extingushers with a threaded adaptor, these i can get refilled for a tenner from my local fire extinguisher company.I only used one and
a bit for the entire car.
Paul.
quote:
Originally posted by craig1410
I have a pub gas bottle and it says that it is CO2 with no mention of Nitrogen. Surely they would have to label it if there was nitrogen in it?
Don't take this wrong but is this fact or hearsay? I only ask because I have welded my entire car using pub gas and never had any visible
problems, even after doing a few test welds and cutting the weld apart with a hacksaw for inspection. The only time I get porosity is when welding
outside and the wind blows the shield away...
Cheers,
Craig.
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Triton
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| posted on 19/5/05 at 08:41 PM |
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5% argon will give better results....pub gas is for filling yer glass not welding
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clbarclay
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| posted on 19/5/05 at 09:35 PM |
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Pub gas is to be avoided at all costs. Its not particularly good for welding, and certainly no good for beer.
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craig1410
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| posted on 19/5/05 at 09:40 PM |
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Paul,
You say that the regulators are different. If it makes any difference, my regulator is a big bulky cylindrical beast with an adjuster in the end and
the output pipe coming out of the side. I am almost certain that the gas is pure CO2. Is there a difference in the odour because this stuff definitely
makes the inside of your nostrils tingle due to the production of carbonic acid...
Mark, Yes I appreciate that Argon-mix is better but the cost of hiring a cylinder for 2 years (in my case) just to build a single car doesn't
seem to stack up. I tried using some of those little cylinders from Halfords but they are worse than useless. I couldn't get a decent weld out
of them at all despite loads of messing about with flow rate, power and wire feed.
Cheers,
Craig.
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