Thanks for the advice. We welded some sample pieces today. It worked really well with the chill block behind. The samples were simple corner joints, but I guess the parts are going to be different. The corners won't be straight down, they will have a couple bends in them. Hopefully we can figure out a way to make a chill block to fit behind the joint since the fitup of the parts is not the best. I tried some samples without a chill block and it was tough. I had a couple turn out, but didn't have nearly as much color as with the chill block behind. The samples were thinner than the parts so it should be easier welding the parts. Is it possible to weld thin stainless without a chill block and without pulse arc??? I took a test at a company a while back on 18 gauge. It was a box with three sides open and they wanted the outside and inside corners welded. It didn't turn out too good. How do you weld this test without chill blocks?? How do you weld the inside without getting sugaring on the outside??? Clamp a piece of angle on the outside??? I would like to get good at welding thinner material. Thanks again for the advice.