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Propane tourch question

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tomfree

02-08-2003 22:55:50




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OK, I know radiator shops used to use propane and compressed air to feed torches for soldering. My question is could I use an Oxy/Acetylene torch rig and feed it propane and compressed air for cutting/heating metal? If it would work it should be much less expensive to feed than Oxy/acetylene.
Thanks,
Tom




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T_Bone

02-09-2003 10:31:57




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 Re: Propane tourch question in reply to tomfree, 02-08-2003 22:55:50  
Hi Tom,

The heat range of soldering is in the 550*f range, under 1000*f for lead solders. LP works well for this application as the flame can wonder a bit without effecting cutting or welding.

Is it cost effective for the home shop? At the price of acetylene it's making me look harder at it thats for sure but what little I use Acet/oxy is still the best all around for me.

For a commerical shop propylene/oxy can compete with acet/oxy as the flame tempertures are about the same, about 5900*f. One of the steel building mfg's here has swithced and realized a huge savings over acet/oxy. I've never used the gas so I can't say from personal experience.

Propylene is LP mixed with 92%methanol/8%Zylene to get the flame temperatures equal to acet/oxy.

T_Bone

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Paw Paw Dave

02-09-2003 05:57:37




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 Re: Propane tourch question in reply to tomfree, 02-08-2003 22:55:50  
You need propane and oxygen, not compressed air for what you are describing. To cut and weld you need the temps up and just air won't get it. Propane is a little cooler than acetylene but is less expensive. For anything above soldering, and maybe LIGHT brazing you will still need the heat oxygen gives you. BTW, the gas/air torches used around here in the radiator shops are entirely different than oxy/gas torches.
Dave

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ag-lad

02-09-2003 14:15:36




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 Re: Re: Propane tourch question in reply to Paw Paw Dave, 02-09-2003 05:57:37  
I have used propane and oxygen in my shop for years. I like it for cutting. Its not as hot as acetylene, but cuts cleaner and the cost is cheaper, although the oxygen useage is higher than with acetylene. I think that acetylene is C2H2 and when it is used to cut iron, the extra C (carbon) molecule combines with the molten metal while cutting and leaves a hardened slag that dulls your hacksaw blades, drills and other cutting tool bits. That doesn't seem to happen with propane. The black soot that floats all around your shop when you lite acetylene is the extra carbon. On the other hand, welding and brazing with propane and oxygen is not as easy. Just my thoughts, Correct me if I'm wrong.

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george md

02-09-2003 00:21:14




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 Re: Propane tourch question in reply to tomfree, 02-08-2003 22:55:50  
Tom, Yes you can , and it works well .You will need a tip for propane and depending on the threads on your gas regulator you may need an adapter . It cuts better that acetylene , but takes a few seconds to preheat before you are ready to cut.

george



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george md

02-09-2003 10:43:32




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 Re: Re: Propane tourch question in reply to george md , 02-09-2003 00:21:14  
tom , I missed the idea that you were considering using compressed air , that doesn't work you need oxy. I eus acet for bench work , but for quantity cutting or thick work 1 1/2 or thicker I always use propane .

george



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Jim N.

02-09-2003 19:01:25




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 Re: Re: Re: Propane tourch question in reply to george md , 02-09-2003 10:43:32  
I used oxy-propane for 20 years and finally went back to acetylene because of the faster pre-heating when cutting and the acetylene is better for brazing. I have nothing against propane, A 100 lb. tank would last a long-long time, it was cleaner and it did produce less slag when cutting. It just boils down to your own personal situation as to which gas is best.



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