COMMENT

摘要

I always turn to the July issue of Insight to read papers on NDT in the rail industry. This month we have two such papers. The paper by Bojarczak suggests that visual-based techniques can be used for the detection of squat flaws in railway rails, which are difficult to detect using ultrasound and eddy currents. The second paper, by Shen and Cai, employs the enhancement of digital radiographic images of railway castings to detect defects. The results are very encouraging and demonstrate both high-speed detection and a widespread use in the online X-ray inspection of large castings in general.