水电站蜗壳舌板对接焊缝的超声波相控阵检测

Ultrasonic Phased Array Inspection of Butt Weld Spiral on the Tongue Board of the Hydropower Station

介绍了采用超声波相控阵技术检测水电站蜗壳舌板对接焊缝的工艺方法及应用实例。针对该类工件的结构特点,采用区域划分法,将焊缝分成垂直方向上的若干个区,再由电子系统控制相控阵探头对其进行分区扫查。此法速度快、灵活性好、准确性高,检测结果自动记录,缺陷的三向视图,使得检测结果更直观。

In order to better control the quality of inspection on tongue weld spiral plate hydropower station, the insite ultrasonic phased array inspection was employed. According to the structure characteristics of such workpiece, the welds are divided into several areas in vertical direction by using zone partition method. Then the areas are scanned by the phased probe controlled by electronic systems. Four defects were detected with signals being exceeding the threshold, consistent with the anatomical results. This method is fast, good flexibility and high accuracy. The three-dimensional view on defect that provided by the automatic recording diagram of the test results, made the results more intuitive. This method is worth popularizing into the thick workpiece weld application.