Contrary to popular belief, you can weld galvanized tube as easily as bare steel as long as it’s from Allied Tube & Conduit.
BUY Them Here: http://www.eastwood.com/magnetic-welding-small-jig-set.html
Powerful Magnets from Eastwood keep panels, pipes or other parts securely in place during welding,soldering and assembly operations. Shape permits panels to be arranged at 45 deg.,90 deg. or 135 deg. angles. Comes with manufacturer’s lifetime warranty. Dimensions are 4 1/2″L x 3 1/2″ W x 1/2″ D. See them in-use in this video.