First let me admit to gross ignorance in the field of welding, that said, here is my question. I would like to be able the have the capability to weld aluminum, carbon steel and the usual type of stuff that come thru the door. Which type of welder should I get? I can't afford a $1500 rig, just something small. Experince is not a problem as I will be expermenting on the in-law's stuff until I become confident enough to work on my own projects.