集束空気超音波によるスポット溶接部の非接触評価に関する検討(<小特集>M&P2009機械材料・材料加工部門技術講演会)

概要

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Spot-welding is widely used in the various fields of engineering and industries. Since the size and quality of the nugget which is melted and re-solidified part of a welding are closely related to the strength of the welded structure, it is important to evaluate the shape and mechanical property of the nugget. In this work, an air-coupled ultrasound technique with focused transducers has been used for non-contact measurements of a spot welding. C-scan measurements were performed in pitch-catch configuration using a pair of focused transducers operating with tone burst waves at 0.4MHz. Signal processing techniques, such as an averaging, a band-pass filtering, and a matched filtering are employed to improve the signal to noise ratio of the measured signals. It has been found that the C-scan images with the matched filtering have a high signal to noise ratio even though a small number of data is used for averaging.
2010-06-25