TheExpert

Mark the steel tubing where you need it to be cut and lock it tightly in a vice. The tube should be immobile but not held so tightly as to dent the metal. Attach the torch's lines to its oxygen and acetylene tanks. Make sure the valves on the torch are shut tight, and then loosen the valves on the tanks to pressurize your torch's lines. The lines should fatten up and become more rigid when this happens. Loosen the valve on the torch to about half-way open. Hold the striker in your other hand and squeeze the wire handle. The piece of flint on the inside of the striker should kick up sparks and ignite the torch. Adjust the valve on the torch so that the flame narrows down and losses its smoky quality.

I like Heroez's advise.

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.063 3003 aluminum. I think this is enough.

Spot welding is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current flow. Work-pieces are held together under pressure exerted by electrodes. Typically the sheets are in the 0.5 to 3 mm (0.020 to 0.12 in) thickness range. The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is a lot of energy can be delivered to the spot in a very short time.