| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for diagnosing a flash-butt weld zone, which can easily and precisely diagnose a state of a weld zone, when a preceding steel sheet and a succeeding steel sheet are joined by flash-butt welding and then continuously fed into a continuous cold rolling mill for example, employing a flash-butt welder for an uncoiled steel sheet of about 1.0-10 mm in thickness and about 400-2500 mm in width. SOLUTION: In the flash-butt welder for joining the preceding steel sheet and the succeeding steel sheet in a continuous cold processing line, the quality of the weld zone is diagnosed based on a temperature distribution obtained by measuring temperature on the weld zone in the designated width from the weld line as a center, in the state before or after trimming of a bead within 10 seconds after the completion of upsetting. COPYRIGHT: (C)2006,JPO&NCIPI |
