"rangerssuck" wrote in message
...
On Thursday, June 4, 2015 at 8:06:17 AM UTC-4, John B. wrote:
It is easy to do,
just paint the area with a marker - permanent or white board - and
then heat the area with a torch until the marker goes away.
Interesting - i'd never heard of using a marker as a heat indicator.
Any idea what temperature that "vanishing point" would indicate?
I've always used these:
http://www.tempil.com/products/tempilstik-original/
Supposedly around 800F, which isn't too far below the
(alloy-dependent) melting point. Aluminum melts without glowing red,
so don't heat it much past that vanishing point or you'll reach
another one.
I'd practice on a piece of 6061 sheet first, especially if you don't
have hands-on experience forming metals that work-harden and crack.
-jsw