JOINING METHOD OF METALLIC PLATE

PURPOSE:To prevent the adverse influence by a cutting gap and to perform quickly welding with high accuracy by superposing the tail end of a preceding metallic plate and the front end of a succeeding metallic plate, cutting the superposed end by a beam, butting two sheets of the metallic plates on a plane and irradiating zigzag the beam thereto. CONSTITUTION:A preceding metallic plate 1 and a succeeding metallic plate 2 are clamped to overlap in contact with each other and a laser beam 7a is irradiated from the upper direction perpendicular to the plates 1, 2 above said plates to cut simultaneously and linearly the plates 1, 2. The end plate 8 of the plate 1 and the end plate 9 of the plate 2 are mechanically removed. Only one or both of two sheets of the plate 1, 2 are moved only in the vertical direction to array both plates on the same plane. A laser beam 7b is thereafter zigzag irradiated thereto along the same route as in the stage of cutting. The two plates 1, 2 are thus connected by welding to each other.