| 摘要 |
An electric resistance welding operation management device 100 manages a welding operation during manufacture of electric resistance welded steel pipe, in which heat is input to a steel plate 1, that is being conveyed along a specific conveyance direction and formed into a circular tube shape while pressing side faces of the metal plate 1 with a pair of squeeze rolls 2a, 2b, to weld together two circumferential direction edge portions 11a, 11b of the metal plate 1 converging in a V-shape. The electric resistance welding operation management device 100 includes an image input means that inputs plural images, successively captured over 3 sec and each including a Vee convergence region of the steel plate 1. The electric resistance welding operation management device 100 includes a welding point position derivation means that, based on each of the plural images input by the image input means, derives the position of a welding point, based on acquired data that takes as the position of a welding point the position, out of positions at each point in time within the specific duration, of a slit end at the furthest conveyance direction downstream point of a weld slit S, having the Vee convergence point as a base point and extending further than the Vee convergence point toward the steel plate 1 conveyance direction downstream side, at the point in time when the slit end is positioned furthest downstream in the conveyance direction. |
