| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.24 ( April 1991 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Multiprobe Type Weld Flaw Monitor for ERW Pipe Mill Hiroaki Kondo, Tadashi Okumura, Osamu Shinshi |
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Synopsis : Ultrasonic inspection system has generally been installed for quality assurance of a longitudinal weld line in the ERW pipe mill. Recently, manufacturing lines tend to change to fully automated factory. Accordingly, it is necessary to automate the conventional ultrasonic inspection system with regard to size arrangements, calibration, and to free the ultrasonic inspection line from tracking on the weld line. As a result of research, the authors have created a new-concept-based inspection method that is named the "Multiprobe method." And, the equivalence of inspection accuracy between this new method and the conventional method were confirmed experimentally. This new weld flaw monitor system by the multiprobe method is currently in operation at Kawasaki's medium diameter ERW pipe mills of Chita Works, thereby contributing to realizing a fully automated manufacturing system. |
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