Originally Posted by
bark_eater
Poking around I found a BTU calculator that gives the following with Propylene and the different flow rates.
T-6 5,927.5 BTU
T-4 1,138.08 BTU
I'm still not sure what it all means, but I've read about "hearth brazing" with propane which seems to be a lower temperature, high BTU process.
Hearth brazing uses a brick enclosure to reduce thermal conduction to the air and keep the work piece temperature up for faster and smoother brazing. It's essentially a cross between furnace brazing and torch brazing.