为解决TOFD检测技术的近表面盲区问题,采用爬波对近表面盲区进行补充检测,利用近表面盲区试块对爬波检测系统进行调校,并对表面刻槽试块以及含近表面开口缺陷的模拟试块进行扫查。试验结果表明,当被检区域在爬波检测范围内时,爬波可实现近表面盲区的覆盖,是一种有效的近表面盲区检测方法。

In order to solve the problem of near-surface blind area of TOFD technology, creeping wave was used to supplement the detection of the near-surface blind area. The near-surface blind area test block was used to calibrate the creeping wave detection system. The block with grooves and the simulated blocks containing near-surface opening defects were inspected. The experimental results show that the creeping wave could cover the near-surface blind area when the interested regions were within the detectable range of creeping wave, and it was an effective method to inspect the near-surface blind area.