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Old 09-08-2017, 07:57 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by bobadame View Post
I've used propane and oxygen to gas weld platinum. That worked great. Then I tried to gas weld aluminum with the same gasses. It didn't work. Don't remember exactly why not but maybe the chemistry was wrong.
Oxy-propane works for me ....
P1150602 propane copy.jpg
P1150604 propane root copy.jpg

The platinum I tried to weld with O/A (flame temp 6300F) was .125" thick and since platinum melts at 3200F, it was slow going.
My .125" steel at 2400F welds a lot faster.

With O/P flame temp at 4100F .050" aluminum welds well at 1250F but even faster with O/H at 5100F.

It's nice to have 2-3000 extra deg.F for a heat margin when welding stuff.
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