One of little niceties of having your own ultra high temp processing equipment including a 3200C capable crucible furnace, is you can do some one off metallurgy. The rod used in welding the rails up on this guy is the second generation version of the one used on the Delta Elite and the LB frame. This time, an additional grain stabilizer was added, then the whole thing vacuum melted for purity. I like the results. Super clean, oxide free welds.