oxy/propane outfit?

/ oxy/propane outfit? #1  

soarkrebel

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I was curious if you buy a set for oxy/acethylene can you use propane instead of acethylene with the acethylene regulators?
i know you have to have the tips for propane but what about the regulator?
 
/ oxy/propane outfit? #2  
You can use the same regulator, and you'll need an adaptor because propane and acetelene tank threads are usually different.
You'll also need more oxygen.
 
/ oxy/propane outfit?
  • Thread Starter
#3  
franz when i first thought about asking this question you were the name that came to mind.
i knew you could answer this. welding supply stores sell the adaptors i take it?
My grandfather always used propane never acethylene. he mainly just cut with it. i need it to cut and heat to bend.
i have a oxygen tank with papers and propane tank. i just need a torche set. i will get a acethylene tank later.

thanks.
 
/ oxy/propane outfit? #4  
The adaptors are readily available at welding supliers, last one I saw was about 20 bucks.
Oddly, while propane cylinders all seem to use the same thread on the valve everywhere, acetelene cylinders don't.
Once you learn to cut with propane, it is more useful for cutting than acetelene, especially on rusty and multi layer cuts.
 
/ oxy/propane outfit? #5  
Franz,
A couple years ago, I bought small MIG and TIG welders. I didn't figure I'd be doing much flame welding, so I opted for an oxy-propane torch set, mostly for convenience. With my limited use and skill, I've been happy with it, but, I always kinda thought it was second best to oxy-acetylene.
What is the advantage of Propane for cutting rusty or multi-layered material?

OkieG
 
/ oxy/propane outfit? #6  
Propane will cut thru multiple layers, and or rust. Acetelene will blow back in your face.
Propane is slightly colder than acetelene, and the argument about welding or brazing with it is ongoing, and will probably never end.
I know people who can cut stainless with propane, and do a half way decent cut on cast iron with it too. I ain't one of them.
There is also a gas called MAPP, (Methyl Acetelene Propane) that combines the best fetures of both gasses. MAPP/air torches will melt brass with no trouble.
 
/ oxy/propane outfit? #7  
I've noticed that I can make better cuts with propane. I seem to be able to see the soapstone layout better so I'm not guessing where I'm going. I guess, since it burns cooler, that it doesn't melt the line before you get to it with the torch.
 
/ oxy/propane outfit? #9  
My newbie understanding of propane vs acetylene is the inner cone of the acetylene flame is hotter than propane. It also consumes all the Oxygen in the flame which makes for an oxidation free weld.

However, the outer flame of propane is either hotter than the outer acetylene flame or at least closer to the same temp. as the propane inner flame. That makes propane nice for heating metal, and maybe better than acetylene for brazing cast iron. That's just my understanding.

Somehow, I have 2 one pound cans of granular flux...more than a lifetime supply for me. I've never tried welding mild steel with propane, but I wonder if using a little flux might overcome the potential propane has for leaving oxidation behind?

OkieG
 
/ oxy/propane outfit? #10  
My first experience with welding of any kind was a MAPP gas rig. I went to buy an oxygen/acetylene rig, but the salesman at the welding supply company recommended the MAPP gas because at the time I was living in town, and it would be kept, and used, in the attached garage. He said acetylene leaks could be very dangerous, but that MAPP gas smelled strong enough that you'd notice it before it reached dangerous levels. It worked quite well for both cutting and welding. Of course, I was slow and my welds didn't look as good as I thought they should, but that salesman demonstrated it and could lay as pretty a bead as I've ever seen done with gas or electric.

Of course, the last few years, living in the country, I had a farmer neighbor who used the electric for welding and propane for cutting, and he, too, could do a lot prettier job than I ever could, cutting with that oxygen/propane rig.
 
/ oxy/propane outfit? #11  
<font color="red"> Are you baking your line on before you start cutting?
</font>
ok Franz i'll bite, what is baking the line?
 
/ oxy/propane outfit? #12  
1, Draw pretty picture with soapstone on steel
2, Run torch over line on steel to bake line on
3, Begin cutting.
This process helps keep the line on the steel during the cutting operation.
When you just chalk the line on and immediately cut, you will often blow the soapstone line off ahead of the cut.
 
/ oxy/propane outfit? #14  
I have a propane/oxygen setup for cutting steel, and my skills continue to improve, however, I still have some trouble with my cuts. Do the directions for setting up the acetylene flame apply to setting up the propane flame? I have never seen anyone else use propane and I have never found directions specific to using propane. With propane, it seems like it takes longer to heat the metal to start the cut.
 
/ oxy/propane outfit? #15  
/forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif The folks at two different welding gas shops have told me NO. The diaphram in the regulator and the hose (unless specifically identified for propane) will over time decay due to the slight amount of oil in propane. They said specifically that is why regulators and hose for propane say so. I have noticed this also. Not sure if the hose and regulators designed for propane could be used for acetelene. I think the pressure for one or the other is quite different,
 
/ oxy/propane outfit? #16  
Dad has used propane for over 30 yrs. and has only
replaced hoses a couple times and original regs.
Propane does take longer to preheat before cutting.
We had a line from 500 gal. propane tank to supply
gas to shop for torch so didn't have to get the tanked
filled very often.
 
/ oxy/propane outfit? #17  
Well, this'll add a little more confusion, or take some away.
Oxygen-Propane only gets to around 4600 degrees whereas Oxy-Acetylene gets to 5500-6300 degrees. Oxy-Propane is OK for brazing and soldering but not for welding. This explains why it takes longer to preheat.
Additionally, Acetelene regulators are only designed to deliver around 10# max output pressure, whereas Propane regulators will generally deliver 40 to 50#. Many Propane torches, such as "Turbotorch" (air/propane) operate at 35 to 40psi.
Most hoses I've seen have a Neoprene inner layer, and propane will not have a derogetory effect on Neoprene.
I can't honestly recall ever using an Acetelene regulator on Propane myself, but I do know it can be done. Many of the prepackaged torch sets being marketed today are sold to operate either way.
 
/ oxy/propane outfit? #18  
What kind of tip do you use for brazing with propane. I have a cutting tip for propane, but not sure about the brazing tip.
 
/ oxy/propane outfit? #19  
Only thing I've ever brazed with propane was tubing, and I use the Turbotorch for that.
 
/ oxy/propane outfit? #20  
I just braze w/ cutting torch.
 

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