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jim rozen
 
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Default brass brazing with a large propane torch

In article , Eric Chang says...

There are alternate burner designs, perhaps more well tried, which use
venturi's made out of pipe reducers. Would these designs be more
recommended?


The trouble with any kind of air/gas torch is that 80% of
the air that is flowing through it is nitrogen, which is
purely parasitic from a heat standpoint. It has to be
raised up to the exhaust gas temperature, which robs
the flame of energy, and it does not contribute to combustion
at all.

This is the primary reason why oxy-fuel torches are so much
better suited to brazing or silver soldering. If you try
it once you will *never* ever go back. The only other
suggestions I could possibly give are to a) preheat the
items in a charcoal grill, and b) be sure to surround them
with firebrick when doing the brazing so that some of the
heat of the flame is contained.

But seriously, borrow an oxyacetlyene rig and try it.

Jim

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