Can Propane do for Brazing

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Hi,  Can Oxy propane be used for brazing? or do I need Aceytlene? Also whats the differance between bronze welding an brazing?  Thanks,
Reply:I am sure if you work at it you can find volumes on this.  Brazing involves capilary action, that is surface energy effects that draw the filler into the joint or perhaps just spread out on the surface.  At some temperature soldering turns into brazing.  Brazing can be done in an oven, carbon arc, oxy propane, air acetylene and more.   There must be some overlap if you have base metals that melt it would be welding.  Without researching it for you.  I bookmarked this spot it is kind of related.   http://www.esabna.com/EUWeb/OXY_handbook/589oxy14_1.htmfran
Reply:Thanks   Fran ,  For the interesting information,
Reply:if you're asking, probably not .you   - can-  braze or weld with one of those tiny 16oz bernz o matic  gas torches  , but it would have to be somethingpretty small , and it takes forever to get a weld pool - the whole thing will be red-hot by the time you run out of gas...and don't quite complete the weld/braze . i bought one of those setups 30 yrs ago to weld something ,it still doesn't work.if you are asking about running gallons of propane and O2, then it might be practical and feasible in awelding- cutting scenario .
Reply:Originally Posted by JoseyHi,  Can Oxy propane be used for brazing? or do I need Aceytlene?
Reply:Originally Posted by JoseyCan Oxy propane be used for brazing?
Reply:Originally Posted by forhireAll fuel gases except acetylene produce an oxidizing flame. Since the weld metal is oxidized it results is reduced strength.
Reply:Originally Posted by metalmagpieYou can ABSOLUTELY braze with oxypropane.
Reply:I use propane/oxygen for brazing and cutting of steel.  Save acetylene for welding, it got real expensive a couple of years a go.  Irony, is you are using bracing a close fitting joint, then the flame only provides heat to the joint, it doesn't melt the filler.Last edited by tapwelder; 01-04-2013 at 11:41 AM.
Reply:If your pieces are thin the propane and a small flame will most likely make it harder to get too hot or even melt steel.  The normal kind of rod which comes coated in flux or the same thing bare and a can of flux doesn't work well too much hotter than it's melting point.  The acetylene flame is both hotter and more of the heat is concentrated at the end of the inner cone so as things get thicker it would most likely be better.  One advantage with acetylene and steel is that you can make a few tacks with steel rod and then fill in the rest in a slightly uphill position with the brazing filler.  The brazing alloys seem to be what is called hot short meaning if you don't have those steel tacks the whole thing falls apart when you re position it to do another section.fran