J0402-2-3 集束空気超音波によるスポット溶接部材の非接触評価の検討([J0402-2]超音波計測・解析法の新展開(2))

概要

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The application of an air-coupled ultrasound to noncontact evaluations of a spot welding is presented. A new type of air-coupled ultrasonic sensor with a focused lens is designed and fabricated. The acoustic lens is designed to generate not only a longitudinal wave but also a shear wave and/or a plate wave in the specimen which is a steel plate of 2.8 mm. C-scan measurements of spot weld model specimens are carried out in a transmission mode, to verify the performance of the developed sensor. It has been demonstrated that the intensity and signal-to-noise ratio of the transmitted signals through the specimen are higher (almost double) than those obtained using a conventional focused air-coupled ultrasonic sensor. Thus, it is expected that the developed sensor could be a useful tool for making quantitative evaluation of a nugget of spot weld.
2010-09-04