We tried making some Damascus a couple of months ago and it seemed to go ok until we went to fold it. Wouldn't stick. I kept it around to play with another time and finally got around to it recently. First thing, I cut the edges off and cleaned up one side to weld them back together. One half was a bit bigger than the other to I cut that off and ended up with these two bits: I figured after cutting it off I would try to play with this small bit to see if it was worth trying to salvage. Looks like the initial welds held. I tried to square it up a bit and round the corners off then twist it. This proved to be a bit more challenging with such a short piece as you'll see in a moment. I'm pretty sure I know what went wrong, the twists ended up being not quite tight enough and I think the bar was too rectangular so they didn't close all the way when I flattened it out. I decided to finish the knife anyhow just to see what I ended up with and this was the end result before sharpening. 3 1/2" blade and 3" 14 layers of 1084 and 15n20 with Indian Rosewood scales and 1/8" brass pins.
