David, I've used propane in place of acetylene to weld platinum. It welds cleaner and doesn't cause the platinum to harden as it does with acetylene. An acetylene regulator will also fit a propane bottle. Never tried to weld aluminum with it but it is certainly hot enough to do it. I'm talking propane/oxygen torch welding.
Looking at some heat charts on these internets it looks like the flame temperature for oxy/propane is about 1000 degrees F cooler than oxy/acet. It's about 4500 degrees. I believe aluminum melts at around 1100 F.
Last edited by bobadame; 06-28-2011 at 06:03 PM.
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