Simple way to join ends of sheet metal rolled into cylinder

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Old 07-21-19, 10:51 AM
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Simple way to join ends of sheet metal rolled into cylinder

I need to make a custom diameter cylinder out of flashing metal. It's pretty easy to work with but I'm not sure how to join the ends without any special tools... Other than making holes and joining with machine screws, any better ideas?
 
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07-21-19, 12:34 PM
Furd
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Depending on the length of the cylinder use several worm-drive hose clamps to hold the metal in the proper place and then "paint" the seam with soldering acid using a tinner's brush or acid swab. Then heat the seam with a propane torch and run solder into the seam.
 
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Old 07-21-19, 10:55 AM
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Can you live with riveting? Almost smooth. And if it must be sealed use aluminum metal tape.
 
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Old 07-21-19, 12:34 PM
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Depending on the length of the cylinder use several worm-drive hose clamps to hold the metal in the proper place and then "paint" the seam with soldering acid using a tinner's brush or acid swab. Then heat the seam with a propane torch and run solder into the seam.
 
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Old 07-21-19, 12:55 PM
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You didn't tell us the material (no, "flashing metal" doesn't tell us what it is), radius or what tools you have available so...

pop rivets
solid rivets
roll crimped seam
srews
through bolting
MIG welding
TIG welding
spot welding
friction stir welding
soldering
brazing
glue/bonding

We want to help but a technical question like yours relies on the details. Without knowing the details we can't offer specific answers.
 
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Old 07-21-19, 02:17 PM
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Thanks guys. Sorry for lack of details. I think it's galvanized steel, very thin... I don't have any rivet tools, nor welding of any kind.
I like idea about soldering, might try that. Also glue, hmm, that's even better what could hold together galvanized steel? Oh I really like suggestion about metal tape for air tightness.
Cylinder diameter about 12", height is about 6"
 
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Old 07-21-19, 03:21 PM
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Liquid nails Fuze-it and Loctite PL Premium 8x adhesive are both good and should work on metal. If you can find it 3M 5200 is very good according to this test I just watched. Just glue the ends and clamp them together to hold it in place when the glue dries.

https://www.youtube.com/watch?v=JyudWdOgrNc
 
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Old 07-21-19, 03:54 PM
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If you go to a HVAC shop I bet they may have a cylinder of the size and length you want.
 
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Old 07-22-19, 04:27 AM
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And an HVAC shop can roll a crimp into the edges so it snaps together nicely. It's how they make rigid ducting for homes and businesses.
 
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