DIYbanter - Working with Galvanized Metal

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Working with Galvanized Metal

Hello,

I'm working with some galvanized metal ( the stuff that you use to
take the smoke from a wood-burning fireplace out through the roof of a
house) that I'm bending into a box... about 16" x 4". It has the
right shape, but I want to make sure that it is waterproof as it is
going outside, and want to ensure that it will stand the test of time
in regards to moisture, heat, cold, etc. What is the best way to
ensure this? I've thought that maybe I should purchase a soldering
gun and put some solder on the joins...will this stand the test of
time? How about epoxy or liquid nails? How about using both solder
and some sort of adhesive?

Thanks

Working with Galvanized Metal

On Sep 6, 8:39*pm, wrote:
Hello,

I'm working with some galvanized metal ( the stuff that you use to
take the smoke from a wood-burning fireplace out through the roof of a
house) that I'm bending into a box... about 16" x 4". *It has the
right shape, but I want to make sure that it is waterproof as it is
going outside, and want to ensure that it will stand the test of time
in regards to moisture, heat, cold, etc. *What is the best way to
ensure this? *I've thought that maybe I should purchase a soldering
gun and put some solder on the joins...will this stand the test of
time? *How about epoxy or liquid nails? *How about using both solder
and some sort of adhesive?

Thanks

You won't find a soldering gun with enough heat to solder galvanized.
If you must experiment, buy a propane torch kit with a soldering tip
and adapter. You'll need 50/50 lead tin, modified acid liquid flux,
other soldering supplies. Your success will likely be limited, so to
be practical, take the next big step. Stop by a welding supply store
and buy a silver soldering kit. It will have a small roll of silver
solder and the proper flux. The propane torch is hot enough to do
light gage galvanized. Clamp your project seams with minimal gaps,
heat the metal to almost red and apply flux. Heat as needed to let the
flux flow, feed in a dab of silver solder to make the joint and allow
to cool. Silver solder is like brazing, but takes much lower
temperatures. It also works very well on stainless steel, so consider
that for your project. Cut off SS sheet pieces can be had at nominal
price at any sheet metal shop. The silver solder is pricey, but worth
it for what it can do. Enjoy.

Joe

Working with Galvanized Metal

On Sep 6, 9:39*pm, wrote:
Hello,

I'm working with some galvanized metal ( the stuff that you use to
take the smoke from a wood-burning fireplace out through the roof of a
house) that I'm bending into a box... about 16" x 4". *It has the
right shape, but I want to make sure that it is waterproof as it is
going outside, and want to ensure that it will stand the test of time
in regards to moisture, heat, cold, etc. *What is the best way to
ensure this? *I've thought that maybe I should purchase a soldering
gun and put some solder on the joins...will this stand the test of
time? *How about epoxy or liquid nails? *How about using both solder
and some sort of adhesive?

Thanks

If the galvanizing coating is not cracked or compromised, it
should be fine. If it is I don't think solder would work well. Some
sort of protective coating suitable to direct exposure to the elements
and any heat levels it might be exposed to would be the only choice.

Working with Galvanized Metal