Patent ID: 8759712
Filing Date: 2014-06-24
Classification: B23K,E04C,Y10T

Abstract:
1. A method of manufacturing a stiffened plate which is formed by welding a plurality of stiffener materials which, together with a steel plate, form closed cross-sectional structures onto a surface of the steel plate, the method comprising: welding edge portions of the stiffener materials which are in contact with the steel plate at a welding speed of at least 50 cm/min and of at most 200 cm/min while irradiating the edge portions of the stiffener materials with a laser having an output of at least 4 kW and of at most 10 kW in a predetermined direction from the external side of the closed cross-sectional structures to provide laser welding to the edge portions of the stiffener materials; and welding the edge portions of the stiffener materials with arc welding performed simultaneously with the laser welding to provide hybrid laser-arc welding to the edge portions of the stiffener materials, wherein the edge portions of the stiffener materials are welded via the hybrid laser-arc welding to join the steel plate and the stiffener materials.