I'm wondering what the best way to do this is (I'm not a metal worker). I have a spherical aluminum mesh, 3" in diameter, sliced in half. I want to join the circular edge of one of these halves to a piece of aluminum foil. In addition, the resulting merged unit must be thermally stable, as it will be exposed to (relatively low) heat when used (ie., no glues or adhesives). The joining itself will not be under extreme stress or weight in use, so one or 2 joining spots are enough, enough to keep it tacked in place.
Is there a welding (or other) process that can accomplish this?