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oxy propane brazing

T

teachingscience

Member
Ok, I've been told that you cannot weld with oxy propane setups. My question is , can you braze using the fluxed bronze rods with oxy propane? I'm out of acetylene and have a propane set up on the shelf and would be happy to wait till spring before getting a new tank of acetylene. I know I've done it before but never with anything that was under much stress. I need to braze a cast iron bracket for a woodlathe tool rest for a friend and don't want it to break for him. So what are your experiences here?
 
As a kid my dad had an oxy propane torch. I brazed sheet metal all the time. I arc welded cast iron wth nickel rods.
 
Best thing for brazing are those bernzomatic tourches. Screw a mapp tank onto them. Lots of heat and good control with your finger. Big stuff then you need as the others have said.
 
Before I became a sheriff's deputy i was a welder/ machinist for 19 years. Welding cast iron has alot to do with the quality of the casting. Some castings are terrible quality and weld accordingly, better quality castings stand a good chance of a decent repair. Arc welding (TIG) with nickel (NI rod)l would be the best option if possible. There are some cast welding rods designed for cast iron gas welding but heating and cooling it at the proper rate is important. You can make a fantastic looking weld only to have it crack during cooling.
 
I used my acetelene welding torch, with propane, to braze-weld light sheet metal, wings on my wd45 radiator bonnet. I had quite an experience getting my gauges set , to keep it from popping out.
 
I hope I still can. I think I?ve only brazed once with acetylene. The other hundred times I?ve used propane just like Pa taught me.
 
I like brazing but only have done it with oxy-acetylene.
But brazing rod melts at around 800? and oxy-propane should reach that high.
Part of the equation will be how big/heavy your part is. For light stuff it should be fine. A heavy part? Maybe not.
I would try it if I had the setup.
100_1787.jpg
 
Since you are already proficient in brazing with oxy-acetylene, you will find that when you use propane as the fuel, the puddle will be a bit bigger as the propane flame is not as hot as an acetylene flame and there is more time for the heat to dissipate in a wider area. There should be no difference in the strength of the joint.
 
I bought a oxy propane set and didn't like it. I could never get the metal hot enough to do the job. Then the torch used up oxygen bottles like candy. A few minutes use and the bottle was gone.
 
I regularly use mapp gas and a Bernzomatic torch to silver solder brass, and it's quite cheap and handy. I've never tried it on cast, but a tool rest should be relatively small so I would think it should be able to get hot enough.
Zach
 
I started my welding OJT with acetylene. When I moved to this farm in '79 the locals were using oxy-propane. I got the necessary adaptations to convert and did so. Results were as others stated, cool flame, hard to light, hard time cutting anything of any thickness. After many years of fighting it, I went back and phew.....what a relief it was.................... (plop plop fizz fizz oh what a relief it is....Alka Seltzer commercial.)
 
Thank you all for your replies. I tried it today with the acetylene and had just enough to finish the job so didn't have to try the propane. I have used the propane before on my old rig but after reading some posts on gas welding it sounded like propane might contaminate the weld and thats what I was afraid of.
 
Propane is fine for cutting. There is a chemical reaction that takes place when using acetylene for welding that propane can't duplicate.
 
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