| 摘要 |
PURPOSE:To improve productivity and to reduce production cost by spraying a flux to the opposed end faces to be joined, butting the end faces to each other, joining both transverse edges of the plates by welding then hot rolling the plates. CONSTITUTION:The flux FL such as silica sand is sprayed to the cut sections BF, AF of a preceding plate material B and a succeeding plate material A. The end faces AF and BF are then butted to each other and both ends in the transverse direction of the plates are welded to join the plate materials A, B. The length YH of a weld zone Y is made about 10% of the plate width BH. The plate material B is thereafter hot-rolled then the material A is hot-rolled by the work rolls of a finishing mill. The unwelded transverse central part of the plates is also rolled by the above-mentioned method, by which the required hot rolling is executed. The welding is thus required only at both transverse ends of the plates and the welding time is made shorter. The shorter line length is further required and the improved productivity is resulted therefrom. The initial cost is reduced as the equipment investment is only for the flux spraying device. |
