Galvanized steel is a protected variety of the metal using the process of galvanization to prevent and repel corrosion.
How to solder galvanized sheet metal.
Beware look alike products like zap or zincalume these cannot be soldered either.
Unlike welding soldering allows the user to bind small pieces of metal together and is commonly used in the manufacture of circuit boards.
However there are many objects in your home made of galvanized steel such as gutters panels or water tanks that can be improved by soldering.
Tradesmen often use brazing or welding instead to create stronger joins between the metals.
Soldering glues the pieces of metal together by melting a softer metal to act as an adhesive.
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For homeowners the simplest solution is an epoxy or other adhesive that is made for joining.
Because the galvanized metal is designed to be resistant to outside harm soldering pieces of steel that have been galvanized can pose a problem if done improperly.
Soldering and adhesive joining.
While soldering is useful for many purposes it has limitations.
Low temperature soldering and adhesive joining are processes for joining galvanized steel that do not damage the zinc protection.
I think it depends on the alloys used in the galvanizing.
However some galvanized sheet metal is impossible to solder.
Zinc sheet part 5 soldering how to solder together two sheets of zinc.