A number of
people seem to have difficulty soldering zinc around their projects. This is because zinc transmits the heat
quickly – more quickly than the tin/lead solder – requiring more heat to be put
into the process. There is a solder that
can make this process easier as it is designed for soldering zinc.
“Galvanite is a lead-free galvanizing
solder formulation designed specifically for high quality repairs to galvanized
steel surfaces. Simple, effective and easy to use, in both manufacturing and
field applications. It metallurgically bonds to the steel, for a seamless
protective barrier.”
https://en.wikipedia.org/wiki/Solder#Lead-free_solder
It composition is 50% tin, 49% zinc and 1% copper. It becomes solid at 200C and liquid at
300C. This makes it a high temperature
solder for stained glass purposes, but will give a firm attachment between the
zinc and the solder or lead came it surrounds.
The high temperature aspect means you need to keep the iron on the zinc
rather than the more easily soldered metals or the glass.
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