22h x 18w, and yeah it's mig, i tried my dads tig welder at his work and it meted through the first set we tried. It wasn't the metal because its chromoly, i guess the machine was too strong, so we did the mig for now.
Lol did you heat up the chromoly before you started welding? and then you tig weld and then heat it after again to make sure that the welds wont crack. Mig is horrible imo.