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Although welding galvanized is potentially dangerous, as long as you are outside it should not be a problem. You can see the pink smoke it makes, just stay to the side so it doesn't go in your welding helmet. That being said, I don't think welding it would make it much stronger. The pipe inside and outside would both have to deform for it to bend, I would think that the weak point would be at the ends of the inside pipe where it goes from two pipes to one pipe. Or I could be totally wrong, but that's what comes to mind.