Ultrasonic device for inspection of metal parts

摘要: When an ultrasonic transducer for detecting flaws in metal plates or the wall of a cylinder is directed at surface to be inspected particular angle, about ten percent signal will appear as Harris waves which propagate into test plate ninety degrees surface. This propagates vertically polarized, with result that has greatly improved noise ratio. For incident medium water and employing shear wave refracting cast iron specific angle approximately 33 from vertical best steel 31 50 brass. Shear longitudinal can employed affect detection subsurface defects changing depending on relation velocity sound medium.