ocy/ac. weld to brazing

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I was wondering what is the difference between the to/ Is brazing like soldering with the toch steup and welding is like using a long stick electrode? Thanks for the information.
Reply:Soldering joins with a filler by capillary action, without melting the pieces being joined.Brazing is very similar (also called silver soldering) but uses a filler that melts above 800F.Welding melts the everything together, not just the filler.  That's just the nutshell.
Reply:What is the difference between the rods and the flame? Thanks
Reply:Brazing uses a silver solder or brass-like filler material.Welding uses a steel filler (assuming you are welding steel), exactly like GTAW.Brazing and welding are both done well with an oxy-acetylene flame.  When I braze copper pipe, for example, I just have to be careful not to get the flame too close and melt the pipe...
Reply:so, welding uses a fllux coated rod, while brazing is just a copper rod? Thanks for all the help.
Reply:Welding or fusion is the action of melting identical joining surfaces together.  You can "weld " two ice cubes together by melting them partially and setting them back in the freezer.  Brazing and soldering do not use fusion to join.  You are using a second alloy that melts below the melting temperature of the joining surfaces.  It makes a molecular bond and sits between the joining surfaces much like a glue.  You can weld with a torch or electric arc as long as the parent metal is melted and fused.    You can also braze with an electric arc as a source of heat.   The term flux describes a material that helps the brazing soldering or welding action.
Reply:Originally Posted by mark123so, welding uses a fllux coated rod, while brazing is just a copper rod? Thanks for all the help.
Reply:Uh, Rojo, A/O is used for welding aluminum. I'll admit that TIG is much easier but you can do it with A/O if that is all you have. You can get aluminum A/O rod with flux on the outside or the inside to desolve the oxides formed when welding. I much prefer the ones with flux on the inside. You do know that an A/O flame when set neutral consumes all the oxygen in the flame. That is why you can weld steel with no flux. Not trying to be smarta$$ed, just pointing out what can be done.
Reply:Also, brazing copper to copper requires no flux, but now we're just geting into details, ad naseum.
Reply:All I've ever done on alum. with the O/A torch is make a mess!!!! I'll try that innercore rod someday, and see how it goes.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:Yea, there is a little trick to it but when you get it figured out it's pretty easy. The lens that absorbs the orange flare the flux gives off makes a big difference too.
Reply:Originally Posted by OldtimerYea, there is a little trick to it but when you get it figured out it's pretty easy. The lens that absorbs the orange flare the flux gives off makes a big difference too.
Reply:Correct. I think actual blue lenses are gone but there is a lens made now that filters the orange out. I still have three pair of cobalt blue safety glasses so I haven't really kept up with what is available.
Reply:Not to dispute the experts, but I'm with Rojo on this as far as my own experience with it goes.  When I was a kid, I tried to weld aluminum with an oxy/acet torch, because someone said it couldn't be done, had to be heli-arc'd (called tig nowadays).   I tried to fusion weld it with no filler or flux, because we didn't have aluminum rod in the garage.   It didn't work very well.  I  tried it on aluminum tubing, I believe they were tent poles, fairly thin-wall, probly less than an inch diameter.  I tried butting the ends together and I tried them fish-mouthed with a file to make a t-joint.  The pieces melted together and looked like they made a weld (a very messy weld), but the bond was about non-existant.  They fell apart at the slightest touch.  There was alot of black too.  That was some 25 to 30 years ago.  Haven't tried it since.  TIG works much better .Last edited by DesertRider33; 04-26-2008 at 12:57 PM.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:O/A & Al welding is done all the time-Just because someone makes a mess of it does not mean it can't be done.http://www.tinmantech.com/
Reply:O/A weld on aluminum, no flux, no weld. Steel, no flux, good weld. Brazing, no flux, no braze.