フェイズドアレイによる溶接継手部欠陥探傷の造船現場での実用化に関する基礎検討

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  • Basis Investigation on Practical Use of Weld Defects Inspection using Ultrasonic Phased Array at Shipbuilding Field

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Welding of hull structural materials is an indispensable technique for the ship construction. If a serious defect exists in a welded joint and grows up, it can lead to the damage of the ship structure, and finally to some significant accidents, such as pollutant spills or danger to the life of crew member. As conventional techniques to check the internal defect in welded joints, radiographic testing (RT) and ultrasonic testing (UT) are used. Recently, thanks to the rapid progress and spread of digital technology in various fields, an inspection technique of phased array ultrasonic testing combining visualization technology has been released, which can make it possible to inspect the internal defect in welded joint just after welding and check the defect visually on site. The inspection technique like this is expected to contribute to the improvement of welding technology and upgrading the skills of welding engineers. In this study, to utilize the phased array ultrasonic testing to the ship construction, many types of welded joint specimens with various welding defects were prepared and inspected for these internal defects in the welded joints by phased array ultrasonic testing. In addition, these results were evaluated, comparing with the inspection results by radiographic testing.

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