The pieces were mitered, slotted, cleaned, argon purged then tack welded together in our sub assembly jig.
The XCr stainless steel tubing cut and tacked together well. Below you can see the small metal tack welds holding the sub assembly together as well as the purge holes that allow the argon to flow (eventually) through the frame as it is welded.
These are actually not the dropouts supplied by Columbus, they are the same “Indy Fab” 17-4 dropouts we use on our 953 SSR’s. I talked with our metallurgist to find out about alloy compatibility and and got the go-ahead.