基于超声相控阵的FSW缺陷三维可视化

提出一种超声工业无损检测的数据采集、处理并使之三维可视的方法,该方法采用超声相控阵线阵探头对焊接接头进行扫描,然后将采集到的缺陷数据在Matlab平台编程进行三维重建.该方法在平底孔人工缺陷验证之后,实现了搅拌摩擦焊(FSW)缺陷的三维可视化.结果表明,该方法增加了客观性和直观性,使测试人员不用逐幅分析诸多二维图像并人脑想像三维的情况,而直接从三维重构结果观察缺陷的空间分布,便于了解工件内部缺陷的形态和走向.

3D visualization of FSW defects based on ultrasonic phased array

An ultrasonic nondestructive testing method was presented, which included data acquisition, processing and three-dimensional visualization. Data acquisition was conducted with ultrasonic phased array probe, after the welded joint was scanned and the flaw data were collected. Subsequently, three-dimensional reconstruction was carried out by programming on platform of Matlab. This method was first verified with artificial defects of flat-bottomed holes, then it was applied to friction stir welded (FSW) joint, and the 3D visualization of the joint defects was achieved. The results show that this method increased the objectivity and intuitiveness in NDT, therefore the testers do not have to analyze a lot of two-dimensional images and imagine three-dimensional situation by themselves; the space distribution of the defects can be directly observed from three-dimensional reconstruction results, the morphology and direction of the defects within joints can be easily understood.