On Wed, 11 Apr 2018 03:25:08 +0100, Rob Morley wrote:

You can get special low temperature solder that works on galvanised
steel.

Aside from the fact that the original can leaked in 2011: regular tin/lead or
tin solder will work on galvanised steel, also on sheet zinc. Just don't
overheat, i.e. an electric iron is better than a blowlamp (which may burn off
the zinc, or melt a hole in sheet zinc). Zinc chloride is a good flux, used to
known as "killed spirits of salt".


Thomas Prufer