Method of manufacturing a stiffened plate by hybrid laser arc welding

摘要

A method of forming stiffened plate by welding a plurality of stiffener materials and a steel plate, so that closed cross-sectional structures are secured onto a surface of the steel plate. The stiffener materials are joined to the steel plate as a result of edge portions of the stiffener materials which are in contact with the steel plate by being laser welded at a predetermined welding speed as a result of a laser having a predetermined output being irradiated from a predetermined direction thereon from the external side of the closed cross-sectional structures. Accordingly, it is possible to achieve an improvement in the weld quality when welding stiffener materials onto a steel plate, and to achieve an improvement in fatigue strength.

主权项

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.