Rob, now that I know what you are trying to braze. You will need a lot of heat
produced for what the steel can will draw away. You will need brazing flux or
welding rods with flux already on them to over come the oxidation, and probably
a lot larger torch. The flux that I use doesn't flow till about 1200 degrees
and the brazing flows at 1400 degrees.
There is a very nice brazing made by Harris that contains phosphorous and
copper that melts and flows below 800 degrees that does not require flux.
Since you are doing copper to steel, a flux that handles that kind of temp
would be suggested. It needs to keep the metal clean and not burn and will
have a high acid content and will need to be done with plenty of
ventilation....................................bob
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