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Compressed Air Propane Torches

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catceefer:
Vtsteam,

Thank you for the video. That is the thing that first set me off thinking about the conversion in the first place. I seemed to recall seeing something, somewhere, a while back when looking into different types of torches, but could not find it again. It looks just what I want and I can even get hold of an old oxy-acetylene torch with which to experiment.

I shall look at it in detail this evening.

Regards,

James.

Will_D:
Just make sure to fit flash-back arresters/non return valves to both lines! You dont want air in your propane or propane in your compressor!

vtsteam:
That's true, Will. And true of oxy-acet, oxy-prop, too. Unless flashback arrestors are built into the torch itself.

I have them at the regulators and the torch.


I found Ironman's full thread on his propane torch:

http://madmodder.net/index.php/topic,9208

vtsteam:
In the video, Ironman shows an early trial with just a conventional oxy-acet welding tip, and the flame blows out. This actually also happens with oxy-propane, not just propane and compressed air.

Oxy-propane tips have a recessed orifice. they need what I would call a flame holder beyond the orifice. I was successful in modifying a #2 Victor oxy-acet weldng tip to burn oxy-propane by adding a counterssunk end in the tip. That's what I use for small parts brazing now -- I used it extensively on the Pipe and Bolt engine.

So I'm wondering if Ironman might have had better luck if he had countersunk the welding tip. By adding the larger shroud he got the same effect, I think.  But it's a large flame. I might be interested in a smaller flame than that, and I do wonder if my modified oxy-propane tip might stay lit with compressed air, instead of blowing out, as ironman's did in the video.

Manxmodder:
Well this is developing into a very interesting and potentially fruitful thread indeed.

I say this because amongst the recent haul of machinery and equipment acquired by a mate and myself there are several oxy-acetylene torches of various sizes,and an oxy-propane cutting torch.

The likelihood of either of us investing large sums in oxy or acetylene cylinders is next to nil . We both use propane torches and have large cylinders of that gas,so if this thread enables us to modify the oxy-acetylene kit to propane-compressed air for brazing,then it's going to be smiles all round......OZ.

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