METHOD AND SYSTEM FOR ULTRASONIC IMAGING DETECTION OF WELDING SEAM OF DUAL-ARRAY PROBE-BASED STEEL-RAIL

摘要

A method and system for ultrasonic imaging detection of a welding seam (2) of a dual-array probe-based steel-rail (1). The method comprises: arranging a transmitting array probe (3) and a receiving array probe (4) on a steel-rail to be detected (1); fixedly attaching the receiving array probe (4) to the steel-rail to be detected (1), the transmitting array probe (3) moving forward and backward or being successively placed on several fixed position points, so that an ultrasonic wave covers the welding seam (2) of the steel-rail to be detected (1); the receiving array probe (4) receiving an ultrasound echo after an ultrasonic wave transmitted by the transmitting array probe (3) is reflected by a defective surface of the welding seam (2); and calculating a height value of a defect by determining starting and ending positions of an ultrasound echo beam reflected by the defect of the welding seam (2) and received by an array wafer (42) on the receiving array probe (4). The method and system can effectively improve the detection efficiency and the reliability of a detection result.