Go to
www.mcmaster.com and type resistance soldering into the search
field. They sell a wide variety of tips and handles. The carbon tips are
used because solder doesn't readily stick to them and they are less
likely to mar plated surfaces.
DOC wrote:
I have managed to come by an old Vigor resistance soldering machine.
It's the 1500 watt SM-800 model in case you are interested.