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19th June 2015, 04:37 PM #1Novice
- Join Date
- Mar 2013
- Location
- Perth
- Posts
- 10
Help with connecting disp. gas bottle to MIG please!!!
Hey guys, I'm really, really new at this so please bear with me. I've got myself a 135 MIG welder and a disposable co2 with the regulator from Bunny's. Everything is secure as far as I can tell but when I twist the valve to start the flow of co2 it just hisses out the side of what I presume is a relief valve on the side of the regulator. I can't find any info on what I'm doing wrong. Any help would be appreciated. Thanks.
Arnie.
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19th June 2015, 07:54 PM #2Senior Member
- Join Date
- Feb 2012
- Location
- Sydney
- Posts
- 187
We bought the same bottle and reg from bunnings (trade flame) at work, first one did not work so we returned it, second one had the same problem.
We ended up going to konect (covenrtry fastners) and getting their system instead. The bunnings ones are rubbish.
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19th June 2015, 09:04 PM #3
...or bypass the disposable bottles entirely and buy a proper cylinder. If you are doing more than one or two jobs, your wallet will love you for it!
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19th June 2015, 09:26 PM #4
It sounds very much like the regulator is faulty and a refund is due at bunnings.To be very candid, I think it's a very expensive way of welding.
If it is the size and price disposable cylinder I think it is, there may be 10 minutes or about of gas time in the cylinder.This would be running with the bare minimum gas delivery setting.
Also material thicknesses below 1-2mm may be subject to blow through as Co2 makes for deep penetration in the material.
Just some facts you should be aware of.
Grahame
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20th June 2015, 12:19 PM #5Senior Member
- Join Date
- Jul 2009
- Location
- Melbourne
- Posts
- 114
Just to add to that, I found that if I screwed the reg on too far it leaked. If it tightened it enough to seal, it worked. Honestly though, as others have suggested, look at a proper bottle, you will not regret it.
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22nd June 2015, 12:43 AM #6Novice
- Join Date
- Mar 2013
- Location
- Perth
- Posts
- 10
Pretty much worked it out like this. Watched a youtube video where a bloke from the UK mentions what the airflow should be with disposable's. 3-4L / minute. Also has this handy flow meter that he plunks on the tip of the gun and adjusts the flow to suit (since the typical reg. for disposables have to read-out). I went out and got one from Burnback in Bibra Lake. Turns out that I really only need to twist the valve a couple turns to achieve this 3L/minute. I suppose the confusion comes from how one would usually fully open their gas tank and then tweak the flow. Whereas, with the disposable, fully open just makes the cheap-ass Bunny's regulator blow it's top. So, without this flow meter I would have been stuffed. I still plan on upgrading to a better reg. And yeah, I would get a proper full sized bottle, but I'm really just tacking a few things together. THanks for the feedback though. It's definitely appreciated lads.
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2nd July 2015, 07:39 PM #7Senior Member
- Join Date
- Aug 2009
- Location
- NSW
- Posts
- 330
i bought a second hand near new DC TIG from a guy on a online auction site it came with a free full bottle of Argon i used the bottle removing broken bolts i seriously got around 1 hour out of the bottle i couldnt believe it that was actually going for around 10-12mins than stopping and shutting off the valve untill i was ready to go again
this was a REPCO bottle im not sure if its any bigger than the ones other stores like bunnings sell?
i was also using it inside my small 3x3m garden shed, to achieve the gas flow i would hold the torch up to my ear and listen to the flow i got it as low as possible than gave it an ever so slightly turn open and that was the perfect flow
now welding outdoors with my D cylinder that all goes out the window haha
disregard my msg just seen your using MIG
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3rd July 2015, 09:45 AM #8
I just got my 6.5Kg Co2 cylinder retested and refilled at the local fire extinguisher place - $130 (refill only normally around $70-80). So in the 5 years I've owned it it has cost me around $350 ... that's a couple of years rental. PS - I actually think that the retest period should be 10 years, not 5, but I couldn't be bothered arguing with the bloke.
I'm currently doing a lot of 1.6mm gal SHS and don't have any issues with blow through (especially if the fit-up is tight). With care, I've even gone down to 0.9mm sheet for body work - 0.9mm + Co2 is certainly not something you would want to do in a production setting, but for a hobby bloke it's fine. However I'd weld all day with 1.6mm + Co2.Cheers.
Vernon.
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