One thing out shop has been lacking is an AC TIG. A friend of a friend came buy whit this in his truck and dropped it off for free. It's missing a power cord (was hard wired), a ground clamp and a vessel for the water. (No tank but I can use the tank off our DC TIG.) He says it works and hell it was free so if it dont work the scrapper will gladly load it up. If anyone has experience with this machine I'd like to hear it. I've never used an AC TIG so welding aluminum is always something I've wanted to get into and I hope this will be good for thin .040 gauge? I got no idea what these settings are for? It says spot gun.. ? Anyone know about this? Thanks for the help and advice.