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Brazing torch

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Stephen Follows11/05/2019 14:50:25
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Anyone know if I can get a brazing torch kit that will run off a patio gas bottle? Still propane but a different fitting. I want to avoid buying a separate bottle because I use large patio type bottles for other functions.

JasonB11/05/2019 15:08:17
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It's not the torch you need to be looking at but the regulator. Don't think I have seen a high pressure one for the patiogas fitting.

Clive Foster11/05/2019 15:14:12
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I think we went round a similar question 4 or 5 years ago and concluded that you needed an adapter (+ hose?) to go between the patio gas bottle and standard torch regulator. Seems to me that the standard kit hoses are a bit on the short side for hooking up to a big bottle.

I imagine there ought to be an auto-shut off device somewhere in the line, or even at both ends, just in case things go seriously wrong like the hose being cut or a connector coming loose.

Various adapters listed by these folk, Leisureshop Direct, **LINK** which may or may not be directly useful but the link does give some idea of whats out there.

Clive

CuP Alloys 112/05/2019 10:39:23
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192 forum posts

Hi Stephen

Patioheaters and similar devices eg camping stoves and barbecues operate at 37mbar.

Brazing torches operate at 2 - 4bar. That's a ratio of 500 - 1000. That's an interesting engineering project to create a universal system

It's cheaper, quicker,safer to get a propane cylinder with the correct regulator. Then buy a Sievert torch. Buy it from the right source and you will get all the technical help imaginable to ensure that all your brazing projects are successful.

Regards

Keith

duncan webster12/05/2019 14:33:31
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In similar vein I recently got a bunsen burner, the idea being that I could use it for little jobs like boiler fittings and save having to get the propane bottle out. Useless! Does anyone know of a burner that will work off mains gas and generate enough heat to silver solder boiler fittings etc. I'm not talking Flamefast size,

IanT12/05/2019 15:49:59
1276 forum posts
128 photos

I think Clive might be referring to a query I had a good while ago.

I'd purchased a Bullfinch Autotorch 404 for small SIFbronze (e.g. brass) brazing work. I already had a large patio gas cylinder, which I had (wrongly) assumed I could also use for the Bullfinch but it turned out that wasn't possible (different connector).

So I ended up buying a new Propane (Red) cylinder which wasn't that much more than just the cost of a refill IIRC (and very cheap compared to disposable gas bottles). I was then able to attach the Bullfinch directly using the Bullfinch supplied regulator. It all works very well for small SIF brazing jobs as well as any larger silver brazing I need to do.

Regards,

IanT

 

PS The 404 generates higher temperatures than most propane guns are capable of and (in my view) is a viable alternative to Oxy-A for smaller brass brazing work - although obviously it's not quite as versatile. But then it isn't as costly or (potentially) as dangerous either...

Side Frame Assembly

 

Edited By IanT on 12/05/2019 15:59:22

not done it yet12/05/2019 16:07:08
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Posted by duncan webster on 12/05/2019 14:33:31:

In similar vein I recently got a bunsen burner, the idea being that I could use it for little jobs like boiler fittings and save having to get the propane bottle out. Useless! Does anyone know of a burner that will work off mains gas and generate enough heat to silver solder boiler fittings etc. I'm not talking Flamefast size,

Natural gas, mainly methane, will have less combustion energy than alkanes with more carbon atoms (carbon to carbon dioxide gives out more energy than hydrogen to water). The only way you will get a hot enough flame would be to swap combustion air for oxygen. I can braze small items with my external mix lampwork burner with propane and the 5 l/minute oxycon. It really needs a 10l/min oxcon as the purity, when flat out, is down to only about 88%.

JasonB12/05/2019 16:23:20
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Duncan, look at some of the jewelers torches. However like the bigger Flamefast torches they use forced air to get the flame hot enough not just what they can suck in.

Assume your supply will be Gas safe etc

Edited By JasonB on 12/05/2019 16:24:47

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