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Propane cutting

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Tooly

12-14-2002 17:08:34




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Saw lots of info on the board regarding acetylene cutting . I have a propane cutting outfit and have never seen a recommendation as to the correct pressure setting range. Any of u guys out there that have experience with Propane cutting?
have used it for 30 years- about time i found out how to do it right
thanks




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Tim Mattox

10-01-2003 12:20:24




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 Re: propane cutting in reply to Tooly, 12-14-2002 17:08:34  
I have a propane cutting setup and I have a problem. I am using a victor cutting attachment with a propane cutting tip. I light it, add the O2 to adjust the flame, everything look Ok, but when I press the O2 handle, it blows out the flame. I've tried different gauge settings with no avail. I set it at 24 psi of O2 and 6 psi of propane. Please help if you can. Thanks, Tim



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John - NY

12-16-2002 16:40:16




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 Re: propane cutting in reply to Tooly, 12-14-2002 17:08:34  
I've been cutting with propane for years. The settings I use are 20 psi on the oxygen and 5 psi on the propane. When you're brazing use 5 psi on the oxygen and 1 psi on the propane. It requires a propane tip for cutting, but no different tip for brazing. I've never had any problems. As far as the �" distance from the cut surface,- use it the same as you would with acetylene.



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Dennis Benson

12-14-2002 17:56:55




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 Re: propane cutting in reply to Tooly, 12-14-2002 17:08:34  
I've been considering changing to propane cutting, and wanted to learn more, too. I emailed Lincoln Electric on their web site where they have a place to ask questions. They said I should verify with a welding shop that my acetylene regulator will fit a propane tank, they also said I will need to buy a special tip for my tourch, and they said I would have to hold the tip about 1/2 inch from what I'm cutting.

I also wondered about using compressed air instead of oxygen, probably in a scuba tank.

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TimC

12-16-2002 18:04:56




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 Re: Re: propane cutting in reply to Dennis Benson, 12-14-2002 17:56:55  
Dennis, my dad started using propane 20 years ago. All he did way change the tip and screw the guages on the tank. He got tired of driving into town to fill up his acy. Never had a problem cutting something over 1/2 inch. Has cut up to 1 inch I know.

The only drawback he has noticed is a few more seconds wait time before he throws the oxy to it.
He has probably saved a thousand dollars or so.
The propane last a long time compaired to acy.

A buddy of mine mis-understood and bought a tank of MAP gas instead. It worked out fine and burns hotter than propane. It also last a long time by comparison.

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Farmered

12-14-2002 19:04:45




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 Re: Re: propane cutting in reply to Dennis Benson, 12-14-2002 17:56:55  
The only thing you'll do with compressed air is cool the metal. The cut is made by rapid OXIDATION of the ferrous metal after it is preheated. Compressed air is used with a plasma cutter. You can do a much neater job without heating the metal as much, a distinct advantage when working with thin material which tends to warp.You can also cut aluminum and brass. You won't save much because your gas savings are offset by consumable tips. Ed

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