On Tue, 05 Jul 2005 17:23:51 +0100, Chris Bacon
wrote:

Why can't you use carbon pencils and an arc welding set?

Because they're rubbish and they never worked well.

You might get these to work on steel, although the resultant "brazed"
joins are brittle and weak, owing to over-heating and the resultant
dezincification. On aluminium, forget it.