Originally Posted by morgaj1
Not to be a party pooper but... I have some serious concerns about the structural stability of what you are building. You have been using an 80-90 amp 110V MIG welder. On 3/16" steel, Miller's welding calculator calls for 160-170 amps and 1/4" calls for 180-190 amps. 110V MIG's are notorious for giving welds with little to no penetration. In my opinon, 110V MIG's are not good for anything over sheet metal. Couple that with the dynamics stresses of a trailer going down the highway, and you have a recipe for disaster. I strongly urge you to consider letting a professional do the welding with the proper equipment so that no one gets hurt. Again, not trying to rain on your parade, but it needs to be said.
Thank you for the concern. As mojo pointed out, we shelved the MIG and got an arc welder. It's doing fine and all of the welds are solid. We'll be taking everything back down most likely to hit the frame with some por15. Once we finish that, we'll secure the chamber. We also got the firebox in, so we'll likely work on that a bit also..it's huge..the outer layer is 31" and inner is 26.. I'll definitely keep everyone up to date. Thanks guys!
EDIT: Thanks TRIPLE-T for checking those state regs! Very much appreciated!