Disc Sander Backing Plate

My disc/belt sander only has one backing plate for disc sanding. This means to switch from one grit to another I had to peel off each pad and replace it with the next finer grit. Since the pads are self-adhesive, this effectively ruins the pad. After learning to weld aluminum, I decided it would be more convenient and cost effective to have dedicated backing plates for each grit. Before the plates could be welded, a fixture needed to be made to keep them from warping during welding. This is my first project that was videoed rather than photographed. Enjoy.