Thanks, everyone; I'm going to take your advice off to my shop now.

I am trying to weld 16 gauge mild steel to 5/8" mild steel square tubing, and can't seem to find the proper settings and/or techniques to make it work. I'm using a Maxstar 200 TIG machine, argon gas (11cfm), 3/32 rod, 1/16 tungsten with cup size 4, and have tried everything in the range of 90 -...