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NDE OF METAL SURFACE BREAKING CRACKS UNDER ADHESIVE COATING

机译:粘着涂层下的金属表面裂纹的无损检测

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摘要

This paper studies inspection capabilities and limitations of the surface acoustic wave and eddy current techniques for surface crack detection in a steel angle coated from one side by an adhesive coating (Fig. 1). The cracks are located under the coating and oriented along the angle. It is determined that although surface wave inspection offers a significant inspection time saving its use is limited by attenuating properties of the coating. While providing reasonable sensitivity with a common epoxy coating it is not applicable when structural adhesive with knit fabric carrier is used. The eddy current inspection requires a raster scan of the area with potential defects and takes longer time than ultrasonic testing. Nevertheless it demonstrated a reasonable sensitivity: 0.01 in deep semicircular cracks can be detected under a 0.01 in thick structural adhesive coating using either differential or absolute probes.
机译:本文研究了表面声波和涡流技术的检测能力以及局限性,该技术可用于从一面涂有粘合剂涂层的钢角中检测表面裂纹(图1)。裂纹位于涂层下方并沿角度定向。已经确定,尽管表面波检查提供了显着的检查时间,但是其使用受到涂层衰减特性的限制。虽然可以为普通的环氧涂料提供合理的灵敏度,但是当使用带有针织织物载体的结构粘合剂时,则不适用。涡流检查需要对具有潜在缺陷的区域进行光栅扫描,并且比超声检查需要更长的时间。尽管如此,它仍显示出合理的灵敏度:使用差分或绝对探头,在0.01英寸厚的结构胶涂层下,可以检测到0.01英寸深的半圆形裂纹。

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