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Non-contact Ultrasonic Inspection Technology of Fillet Weldments Monitoring

机译：圆角焊条监控非接触式超声检查技术

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摘要

It's not easy to detect the defects in fillet weldment which is widely used in various building structures and power plants just with nondestructive inspection due to its complex geometrical shape and difficult access. But it's easy to detect the cracks on the surface or just below the surface of fillet weldment heel part if surface SH-wave, among ultrasonic wave modes, is applied. The traditional ultrasound inspection using surface SH-wave is usually a contact method using piezoelectric transducer, so it's not suitable for a field application because the reliability of inspection varies depending on field environments such as couplant, contact pressure and pre-process, etc. Therefore, the necessity for non-contact ultrasound inspection is increasing. This study proposes non-contact ultrasound inspection method using EMAT (electro-magnetic acoustic transducer), and presented non-contact ultrasound inspection method for fillet weldment through experimental verification.
机译：通过其复杂的几何形状和困难的访问，液体焊接中广泛用于各种建筑物结构和发电厂的缺陷并不容易。但是，如果施加超声波模式，则易于检测表面上表面的裂缝或刚刚在圆角焊盘鞋跟部的表面下方的裂缝。使用表面Sh波的传统超声检查通常是使用压电传感器的接触方法，因此它不适用于现场应用，因为检查的可靠性取决于耦合剂，接触压力和预处理等的现场环境等。因此，非接触超声检查的必要性正在增加。本研究提出了使用EMAT（电磁声换能器）的非接触式超声检查方法，并通过实验验证给出了圆角焊缝的非接触超声检查方法。

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