Creeping wave detection of weld near-surface defects

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.