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Thread: LPG heating torches
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22nd Jun 2012, 04:25 PM #1Most Valued Member
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LPG heating torches
I spat the dummy a few months back and returned BOC their oxy and acetylene bottle's, I wasn't using them much anymore and I got sick of paying the rental fee's. I hardly ever oxy weld anymore and for cutting I bought a cheep chinko 80amp plasma cutter, but I still need to silver solder sometimes and I need to heat stubborn things to get them to bits and maybe the odd unprofessional hardening job.
I know LPG without oxy has less heat but I don't wanna keep paying rental on bottles, I would rather wait a bit longer for something to get hot.
I was thinking about something like one of these GAS BLOW TORCH COMPLETE ROOFING KIT HOSE REGULATOR | eBay
Has anyone here used these or similar in the workshop ?
What are your thoughts ?
Has anyone here made their own LPG heating torch ?
john
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22nd Jun 2012, 04:54 PM #2New Member
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I have something similar but with cyclone burners. They are great for doing copper pipe etc with silver solder. The main drawback is that the heat is very widespread. With oxy you can very quickly heat a small area to welding temp before it spreads very far, whereas with these it takes longer and the heat has more time to spread into the surrounding metal. Naturally they are not as hot either so brazing is more difficult.
Still useful and run off a barbecue bottle. Don't make the mistake of using the supplied regulator on your barbecue though... it'l blow the seals out.
Edit, if you need a little more heat you can get the Bernzomatic unit. They have a "Mapp gas" which burns somewhat hotter I gather.
Excerpt from Wikipedia:
MAPP gas is also used in combustion with air for brazing and soldering, where it has considerable advantages over competing propane fuel due to its high combustion temperature of 2,020 °C (3,670 °F)in Air.
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22nd Jun 2012, 06:47 PM #3Most Valued Member
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I use one of these from www.sievert.com.au Pro 86 Torch Kit and Harris Regulator somewhere around $100.00.
I find it does what I want.
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22nd Jun 2012, 08:12 PM #4Most Valued Member
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Here's a link to pipeclay's torch that works:
Sievert Web Site - Products Catalogue
I bumped into a plumber today who said Reece sell a MAPP torch that comes with a disposable oxy bottle. Might be handy when you want that extra bit of heat. Apparently the bottle costs about $40. I gather the oxy doesn't last very long though.
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22nd Jun 2012, 09:45 PM #5Intermediate Member
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Just wondering shedhappens, I would have thought you might have gone down the path of oxy-LPG. Firstly you only pay rental on the oxy bottle, secondly you only drop 400 degrees C, where as with LPG the temp. is 1300 degrees C.
Regarding the hand piece, I'm not sure if you are able to use the oxy-acetylene hand piece when using LPG instead of acetylene.
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22nd Jun 2012, 10:20 PM #6Most Valued Member
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Trackhappy, thanks for the info, I have got some oxy/LPG cutting tip's and used them quite a bit a few years ago but I don't want to rent the bottles anymore, except for argon. I have used my son's MAPP gas but it's too small, it's ok on copper pipes but not enough BTU's for me
pipeclay and jack620 thanks for the tip on sievert, I have looked at them, pricey but if they work I will definitely consider.
pipeclay could you give me a bit more info please on the Pro 86 Torch, an evaluation of it's performance, eg can you heat up and bend 20mm rod ? what are it's limit's ?
Alby123 it's no worries using LPG through a commet 3 torch, when I used LPG for cutting years ago all I did was I changed the LH thread nut on the acetylene gauge to one that suited the LPG bottle and used the 2 part fluted LPG gas cutting tip's. It was slower but much cheeeeper cutting.
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22nd Jun 2012, 10:29 PM #7Most Valued Member
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Havent tried it on 20mm but have bent the occasional piece of 12 and 16mm.
I think that you might have to source a slightly smaller head or make something up so as to try and localise the heat a bit more for 20mm,
Cant remember but I think the one that comes with the kit is 32mm.
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22nd Jun 2012, 10:35 PM #8
I know it isn't exactly the ideal solution, but I always have oxy/acet in the shed and you're welcome to use it if you buy a straight gas rig and need that extra bit
Cheers
DJ
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22nd Jun 2012, 10:57 PM #9Most Valued Member
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Thanks for offer Acco, I have all the oxy gear and I'm not getting rid of it, just the bottles, if I get a job where I need it I'll just price it into the job and get some D's or E's for the job, not that I'm expecting to, getting to worn out for heavy work.
pipeclay the sievert torch looks good, plenty of different burners for it too,
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22nd Jun 2012, 11:04 PM #10
No worries, on another note, I got those centres last week, haven't checked to see how hard they are yet, but I'll get onto it soon
Cheers
DJ
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22nd Jun 2012, 11:12 PM #11Most Valued Member
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25th Jun 2012, 11:34 PM #12Most Valued Member
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Bullfinch 404 Autotorch
I've got one of these LPG torches and they work very well.
Bullfinch 404 Autotorch Brazing Gas Blow Torch Kit | Buy Now at gasproducts.co.uk
These will easily hard bronze braze up to about 1 inch diameter steel.
I originally borrowed the Bro-inlaws as he never used it, and was so impressed that I bought my own.
Much better than MAP gas and cheap cheap to run.
I previously had an Oxyset but also got rid of it because of the bottle rental cost.
Try and sell your oxy gear - no one wants them and you will get peanuts for it.
The Bullfinch gun works great and it's handy for hard bronze brazing all sorts of small stuff, like carbide tips on cutters and building up small steel model engine parts, repairing linkages etc.
I have gone up to much bigger bronze brazing jobs with it by using another bigger general purpose LPG torch, together with the Bullfinch, and if that's not enough you can also use the guns in a brick hearth to concentrate the heat.
The bro-inlaw got his Bullfinch at a farm field day and I got mine later from the only (same) distributor in Australia which happens to be at Mt Barker near me (Adelaide).
EH Cambridge
Worth the money.
Rob
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26th Jun 2012, 09:12 AM #13Most Valued Member
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mapp is the only way to go if you dont have oxy/acet
burns hotter than lpg
But the equipment has limitations...ie silver soldering (15%) cu to cu limit is about 1.125" in still air...if breezy then you need to shield...1" and below I have no problems
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26th Jun 2012, 10:23 AM #14Most Valued Member
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That's incorrect with these new generation LPG guns.
These are NOT your old Primus type guns.
These specialty LPG guns WILL do hard bronze braze and not just silver solder.
I saw the Bullfinch gun demonstrated at a farm field day and was sold on it.
It can't match oxy on size of job (ie big stuff) but it will easily hard bronze
And as I said, it's MUCH better than MAP gas.
I bought one - so I know what I'm talking about.
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26th Jun 2012, 10:47 AM #15Most Valued Member
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[QUOTE=nearnexus;1510912]so I know what I'm talking about.[/QUOT
Your say so is not convincing me, and while your entitled to your opinion may I suggest we both check our facts..maybe wikipedia has some information ???
I note that your link says 1200C...wonder what temp mapp burns at with air?
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