steve wrote:
Does anyone know if I can still get hold of a carbon brazing torch? I
saw one a few years ago. It had two carbon electrodes in a kind of
holder and connects to an arc welder. Also, do they work? Are they any
good?

They work very well. I haven't seen the rods about for a while..
I got some a while ago that were solid hard carbon. They didn't
work. The ones that did work had a core of different material.
Both sorts are copper coated. Be very careful to cover up when
you use these, sun-burn and arc-eye are very unpleasant. Use
a good mask.