that's all well and good but this guy can't weld aluminum. it is best to start at the most basic level. get some clean al, use default settings, put the amps to max, plug in the foot pedal, and light up your tungsten until you get a feel for that point where the material transitions from solid to liquid. i did not look to see what winky's machine is capable of so i should not have thrown out the 3/16 's thk suggestion offhand.
if you like jody's videos here is one, the one you should start with.
http://www.youtube.com/watch?v=rR8Rlpf0ELQ