Method of monitoring acoustic contact in ultrasonic testing

Details Method of monitoring acoustic contact in ultrasonic testing Method of monitoring acoustic contact in ultrasonic testing

G - Physics

01

N

349/44

G01N 29/10 (1990.01)

Patent

CA 2006310

- 14 - METHOD OF MONITORING ACOUSTIC CONTACT IN ULTRASONIC TESTING A b s t r a c t A method of monitoring acoustic contact in ultra- sonic testing comprises the steps of selecting the prism angle of radiating and receiving ultrasonic transducers to be smaller than the first critical angle, placing the transducers on the surface of a welded joint at a predetermined distance from the lon- gitudinal axis of a weld, said distance being chosen taking into account the thickness of elements welded together, the width of reinforcing beads and the angl- es between directions of longitudinal and transverse ultrasonic waves radiated into the welded joint and a perpendicular to the surface at the point of radiation of the waves, and evaluating quality of acoustic con- tact by analyzing the amplitude of an echo pulse re- corded at the moment determined by the time of propa- gation of the ultrasonic wave in the material of the transducers and by the speeds of propagation of the longitudinal and transverse waves in the material of the welded joint.

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