Found this on another site & thought it would make a great tec article for the mag. Good reading if your into doing for yourself.
http://www.hotrodders.com/forum/my-diy-tig-welder-77730.html?highlight=diy+tig  

Dont know why the links wont post correct for me.  

Here is another one. Stick welder this time with a good wire diagram. Microwave ovens are good for more than making your food into scorching hot rubber.  

http://www.dansworkshop.com/Aluminum%20Foundry.shtml