Check this out.

Anyone can fix aluminum. I've welded aluminum for 20 years, and this is by far and away the best, and easiest I've seen. I have not tried it personally, as I still have my TIG welder, but some close friends of mine have, and nothing bad has been said. Tranny cases, intakes, etc....

It is not "welding" persay, as it does not melt the base metal. However, look at it like" brazing" aluminum. I give it a thumbs up. Read the site and watch the video. The kit is a bit pricey at $40/20 rods or so, but much cheaper than buying the equipment, or taking it to a shop. (My minimum is $60 for any weld job.)

http://durafix.com/