It is fairly simple to get the soldering on the steel done by just altering a few of the standard soldering steps for galvanized specific ones.
How to solder tin sheet metal.
Soldering glues the pieces of metal together by melting a softer metal to act as an adhesive.
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.
While soldering is useful for many purposes it has limitations.
Learn the basics of soldering two pieces of metal together.
Soldering tin metal is easier than other metals because the steel metal materials are pre coated with a layer of tin.
This layer of tin also allows tin to be soldered at a lower temperature than other metals typically in the 150 to 200 degree fahrenheit range.
These cans are still widely used for soups and vegetables.
Tradesmen often use brazing or welding instead to create stronger joins between the metals.
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What a great video showing you how to solder tin.
When soldering any sheet metal use soldering coppers iron and not a torch.