基于超声相控阵的轮辋探伤实证分析

Empirical analysis of the rim flaw detection based on ultrasonic phased array

基于相控阵超声探伤技术,采用直射声束法对轮辋轴向缺陷试块中横孔的径向深度和轴向深度进行了检测,精确定位了横孔的位置,并通过AVG曲线法对缺陷的尺寸进行了定量评定和分析。实验结果表明,缺陷较浅则检测的误差波动较小、干扰波较少;缺陷较深则可能出现轮廓回波等非缺陷波,对缺陷回波的分析有较大影响;远场区的缺陷可以通过AVG曲线进行精确评定。

In this paper, direct sound beam method was used to detect the radial and axial depth of the transverse hole in the rim based on the ultrasonic flaw detection technology. The transverse hole was precisely orientated and the defect size was quantitatively evaluated by AVG curve. As the experiment showed, if the defect was shallow, the error fluctuation and interference wave were less. If the defect was deeper, non-defect wave like profile echo would appear, which would affect the analysis of the defect echo. Defects in far-field region could be accurately assessed through the AVG curve.