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In this paper, the principles of the designing and the building of the welded ships are shown ; the numbers of rivets, the length of weldings, and the reduced weight owing to the adoption of welding are calculated from the drawings ; comparing above results with the practical field records the methods of estimating the weights of the rivet bars and the electrodes for purchase and the hull weight of the initial design are established ; and the man-hours for the constructions of riveted ships and welded ships are compared to give a reference for the rationalization of the field works.