WWII ship construction slugging welds

Historical precedent for the Nova Scotia case. Welders on 16-inch armor plate, bored with 600-pass joints, would throw in pieces of pipe or bundles of electrodes and bury them in the weld groove.

It was very common in World War Two when they tried to build Liberty ships and stuff. Not necessarily Liberty ships but on battleships and stuff — when you're welding 16-inch-thick armor plate it's really dull putting 600 passes into the same little section of weld. People get a little break, they might take a piece of pipe, or they may take a bunch of welding electrodes themselves, and they just throw them in the big groove, and they weld over them. No one could find it because they're buried between several inches of steel in this old armor plate. But it did weaken the whole thing. It's like making perforated steel.