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Rivets/ Welding

Even after the introduction of welding the shear strake was still rivited due to the high stress concentration and the naval architetcs of the day did still not Have confident in welds .
I had an emergency docking of an old dredger into the Pictou shipyard in Nova Scotia ( she was all rivited ) . The Pictou yard incidentally during the war set the record for tons of ship produced per man per day . They built Victory vesssels ( all welded )
The Dredger had caught her bucket on one of the seams and ripped it apart . Divers plugged her with matresses etc while we cleared the slip to recieve her . The repair was simple enough except there were no riviters ( we would have had to go to the graveyard to dig them up ! ) Also there were no " Huck bolts readilly available ( they are like a rivit except they are fastened bye a hydraulic jack insted of using the contraction of the rivit as it cools to effect the joint . We eneded up in doing a full weld repair which was difficult when it came to mating the new plate with the rivited connection as they were not flush as you suggest but being lapped reqired some forging of the new plate to marry the shape .
The real skill however was not so much in the hull which only saw about 15 PSI ( for a 30 ft draft vessel ) of water pressure but in the skill of the boilermakers who ( in the case of Scotch boilers ) had the same lapped connections to deal with but for a woking pressure of around 250 PSI which meant a test pressure of 2 times that ie 500 PSI. I have some interesting recollections re boilers if anyone is interested .
Derek
 
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