ULTRASONIC FLAW-DETECTION DEVICE, ULTRASONIC FLAW-DETECTION METHOD, AND METHOD FOR INSPECTING WELD ZONE OF PANEL STRUCTURE

摘要

This invention provides a technique that allows high-speed ultrasonic inspection while minimizing the amount of mechanical scanning performed by an ultrasonic probe, even when inspecting a long weld line. This ultrasonic flaw-detection device comprises the following: first and second ultrasonic sensor arrays on opposite sides of a weld zone, each of said ultrasonic sensor arrays being provided with an ultrasonic transducer array that sends and receives ultrasound to and from the weld zone; an ultrasound-sensor-array holder that keeps the distance between the first and second ultrasonic sensor arrays constant and moves the first and second ultrasonic sensor arrays in the lengthwise direction of the weld zone; an ultrasound controller that converts the ultrasound received by the ultrasonic transducer arrays to echo signals; and a flaw-detection controller that uses said echo signals to detect defects in the weld zone.