ULTRASONIC DETECTION METHOD OF THE INTERNAL DEFECTS OF A RAILROAD TRACK RAIL LOCATED IN THE SIDES OF THE HEAD OF SAID RAIL AND DEVICE TO CARRY IT OUT

摘要

An ultrasonic beam is made to penetrate into the rail from the median surface (A) of the rolling table of the rail along a direction forming in horizontal projection an angle ( alpha 1) comprised between 10 DEG and 25 DEG with the longitudinal axis of the rail and in vertical projection an angle ( alpha 2) with the symmetric plane of the rail comprised between 60 DEG and 80 DEG . The echoes reflected by a displaced oval flaw are detected either directly or indirectly.