Not all aluminum can even be welded. You have to know what type you are welding, and use the correct filler rod for the job. I would start with some 6061 aluminum and get the correct filler rod for it. I cant remember the number for the rod but there are all kinds of charts on the web. The puddle will really just kind of look shiny. not really like a puddle of steel. obviously different people find what works best for them but as far as balling the end of the tungsten I usually bring it to a point and just put a ball on the end about 1/32 around. some people like it bigger but it's probably subjective. As you weld across the aluminum it tends to get hotter so you reduce the heat as you go. The more you do it the better feel for it you get. Just play around with it and you'll find what works best for you.
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