复杂结构中焊接缺陷的空间分布特征

采用X射线实时成像方法对复杂结构钛合金激光焊件进行了无损检测，并基于缺陷位置的线灰度分布曲线确定了焊件中微小缺陷的空间位置，推导出了一个计算缺陷埋藏深度的公式。针对峰值异常和斜凹形异常缺陷分别提出了一个缺陷到射线穿透焊件最薄处的投影距离自动提取算法。试验结果表明，上述算法能很好地计算出投影距离并进而确定缺陷空间分布特征。

Spatial distribution features of weld defects in complex structure

X-ray real time imaging method was adopted to nonde-structively test the complex structure welding parts of titanium alloys, the spatial position of tiny flaws was determined based on the line profile distribution of flaws position, and a formula which could calculate the burial depth of flaws was obtained. According to the characteristic of abnormal peak and abnormal slant-concave flaw, an automatic extraction algorithm of projection distance was presented individually. Experimental results showed that the above algorithm can figure out the projection distance very well and can determine the spatial distribution features of the flaws.