DW came home from the craft show with a wire basket into which one places a flower pot…supposed to enhance the flower, I guess. Of course the wire basket is large enough for the pot, but not for the saucer, so now if the pot drips, the counter gets wet. So in a brilliant flash of an idea, I offer to make a tin liner…shouldn’t be too hard…7″ sqaure with a 1″ turn up on the sides. Almost worked. How do you solder galvanized tin? I tried mapp gas torch with regular solder and flux…almost worked, but it wasn’t a clean solder job like on copper pipes, adn one corner leaks a little. I don’t mind trashing that one a building a new one, since it was simple to cut out and fold, but the soldering has to improve.
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I've never tried soldering it but welding galvanized can give you one wicked bad headache. I wonder if grinding to get down to bare steel would give you a better ...
Hey, here's an idea! Why not make it out of copper? Then you've got something decorative too.
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We used muratic acid to remove the galvanizing in our sheet metal classes in high school. Not pleasant but gets the job done!
Don't know what "regular solder and flux" is. You can try a 50/50 acid core with a flux made for galvanized. You can use a rod called 3 in 1 made for this also, no flux needed. I think I would give the seams a squirt of Lexel or epoxy.
KK
To solder First you need to clean the galvanizing,
that you need to sand the galvanizing off where you want the solder to stick.
Next you acid paste on top of where you sanded,
You should first tin the metal (that is coating the two piece of metal with solder before you put the two together)
when the acid paste melts you will need to keep the heat on the metal for a little bit more it will be warm enough when you touch the solder to the metal. To do it right you heat one spot and at the far end of the seam you touch the solder to it will melt and flow to the heat.
After you tin both pieces you put the to pieces together acid paste between the to pieces and clamp and reheat the solder will flow together. You may need to add just a bit more solder
Soldering galv is tough to do with a torch. You first need to clean the galv with muriatic acid (which also acts as flux). I use a soldering copper on galv gutter. Pre-tinning will help, but is not necessary in your situation. Try using propane rather than mapp gas. You're probably getting the metal too hot with the mapp and burning your flux off.
"regular solder and flux" means it's what I use for copper water pipe. I went to mapp rather than propane because I wanted a higher heat...now you tell me I need a lower temp? Oh well.
I think I'll follow Piff's advice and get a small sheet of copper. I can solder that, and it will look nice.
And it won't rust if you use copper. The muriatic makes the plating break down on the galvanized.