DEFECT RECOGNITION SYSTEM, MAINLY FOR INTERNAL DEFECTS, SUCH AS HAIRLINES IN WELDED JOINTS

摘要

abstract The invention relates to a fault detection method, in particular internal, such as cracks, by which emits longitudinal ultrasonic waves of a frequency between 1 MHz and 6 at an incident angle of 60? 3 ° to the wall or surface of one of the two parts in the direction of the zone to be inspected; detecting the first reflected echo for a predetermined period of time and preferably this echo is compared with a reference echo for determining the presence or absence of defects in the base metal and / or in the filler metal and / or at each interface.