面积型缺陷方向性对垂直接触法超声检测可靠性的影响

摘要

垂直接触法超声检测的优点是对面积型缺陷的检出率较高.然而,面积型缺陷的反射波具有方向性,当入射声束轴线与面积型缺陷不相垂直时,由于面积型缺陷方向性的影响,使缺陷反射波不能被探头接收,导致缺陷的漏检.对面积型缺陷方向性对垂直接触法超声检测可靠性的影响进行系统地分析,并加工不同尺寸、不同方向的面积型缺陷进行对比试验,总结出面积型缺陷漏检的各种因素,并提出相应的对策和措施.%The advantage of ultrasonic testing is the high detectable rate for planar flaw. When the axis of the reference sound beam is not normal to the flaw,the reflected wave will be difficult to be received by the probe due to the influence of the directivity of planar flaw and the flaw can not be detected. The influence of the directivity of planar flaw on the reliability of vertical contact technique is analyzed. Test samples with different size and directional flaws are made,and contrast tests are made. Then the correspong-ding measures are proposed.