"Robin" wrote in message
...
On 27 Mar, 18:59, whit3rd wrote:
On Mar 26, 1:29 pm, Robin wrote:

I'm working on a little project (a spotlight) that is basically a bit
of aluminium tubing, 50mm ID, 5mm wall thickness. I was wondering the
best way to close the end of the tube
c) Cut a chamfered plug and bond it to the tube - not sure what
adhesive to use

How about solder? With the right fluxes and aluminum solder you
get a good tight join. Drawn plug of soft aluminum would be
suitable, too.

I've got some aluminium solder stuff, Lumiweld or similar, but can
never seem to get the same results the demonstrator shows! Didn't come
with flux - you had to melt a pool of solder and then scratch through
to break the oxide - I think it then reacted with the aluminium to
break the rest of the oxide. Not sure how I'd do it with this
application

Try cleaning/saanding the tubing end just before using the stuff.

This will eliminate the oxide issue and enable a better bond.

The demonstrator probably did his demonstration just after giving a spiel
during which he was "brightening" his materials.