Silver solder should work for your needs. I have made model ship propellers with it, so it should be able to stick some tubes together. Clean well, and use flux. You can use a big soldering iron, or flame.

Cool! I think I'll try that!

I'll post pics when I'm able to get to the project.

Oh- make sure you get real silver solder, not the silver-bearing solder that the DIY store has. It's much stronger.

Where do I find the right stuff for the job?

I usually get mine at the hobby supply store, but otherwise it's used in jewelry-making. Stay Brite 8 is the name (Tin-Silver alloy.) You might even try eBay for 15% silver solder.

Edited December 5, 200916 yr by TomoHawk

Cool. Thanks, Tomo!