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transverse flaws such as lack of fusion and cracking in rail can only be located at teh top and bottom surfaces with a 45 degree wedge, and somewhat with a 70 degree. To be able to detect transverse flaws at other locations a 45 degtree tandem probe technique does well.Set pitch-catch signal to middle of crt screen.Fusion flaws in the rail head are best detected by using a pitch catch mode using two 45 degree wedges on opposite sides of the railhead. Hope this helps somewhat Give it a try.
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Information
UT - Ultrasonic Testing
