On 14/11/2012 13:42, Adam Funk wrote:
I'm trying to curl up some small copper pipe (or tube, if you prefer)
to make a toy boat along this line:

https://en.wikipedia.org/wiki/File:R...pe_pop_pop.JPG

I tried some 10 mm (or so) pipe that I found in the cellar, and it
kinked too easily. I got some "5 mm X 0.45 mm" tubes from a hobby
shop (aimed at model railways, I think), and that's even harder to
bend & easier to kink.

Is it worth trying to anneal a piece with a blowtorch? If so, what's
the best procedure?

Get it glowing cherry red green tinge to flame and then drop it in a
bucket of water. Fine pipe may throw a jet of hot water out so wear eye
protection. Dry sand in the tube and ends sealed with wax or tape before
you try to bend it will make it keep its shape.

You only need to anneal the part you will be bending.

--
Regards,
Martin Brown