| 摘要 |
<p>PURPOSE:To surely detect the welding position of belt-like steel sheets without giving ill effects to a product and to permit stable rolling by providing semicircular notches of a prescribed size to both ends of the weld zone of said steel sheets and optically detecting the same. CONSTITUTION:The belt-like steel sheets 1 are butt welded by a welding machine 2 and are formed with the notches 14 at both ends of the weld zone by a notching device 3. The notching depth 17 of the notches 14 is specified to <=10mm of the end cutting width and the notching length 16 is specified to about >=60mm of the moving distance of the steel sheets or above in the response time of a detector. The notches 14 are detected by the optical detector 4 and the steel sheets are rolled by decreasing the steel sheet speed with a control device 6. Since the notches 14 are cut away in the final stage, there is no ill effects to the product and the stable rolling is executed by surely detecting the weld zone.</p> |
