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I'm no pro at sweating copper but cleaning both mating surfaces is paramount - they make nice tools that do this...
Clean it swab it with flux and solder the joint by pointing the flame in the direction you want the solder to go. When it is done perfectly the joint will acutally pull the solder into the seam. If you practice with just a few extra pieces you'll get the hang of it.
I would wonder if welding the galvanized would compromse the metal? Welding is a lot more heat than solder...
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