I am no welder, but TIG set on AC (other settings I usually set to book recommendation) is the only way I can weld aluminum. It is the easiest method I know of, although much harder than any method of welding steel. The goofy part of welding is that aluminum doesn't quite want to puddle like steel does, so you have to really watch it, as it can go from nothing, to burned through in no time.
The methods talked about in this thread, and that video are brazing. The difference is you are not melting any of the metal on the part, only the filler. It is heavy duty soldering in essence. All you need is hardware store MAPP gas and a brazing rod. You can do it with propane, but MAPP is hotter and easier.