. . . and on the rails

Knight, Helen
March 2004
Engineer (00137758);3/19/2004, Vol. 293 Issue 7647, p11
An ultrasonic device for finding difficult-to-spot defects deep within welds is under trials on selected railway sites in Great Britain. This inspection tool, being developed by Imperial College spin-out Guided Ultrasonics using technology from the Research Center in Nondestructive Evaluation, can be used to detect cracks deep within rail welds, which are difficult to spot using existing techniques. Conventional ultrasound inspection devices send a signal into the rail head from above, either straight down or at an angle, and if the signal meets a crack in the rail it is reflected back.


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