Ultrasonic detection block device for steel rail welded with cable on rail waist and detection method

Abstract

The invention discloses an ultrasonic detection block device for a steel rail welded with a cable on the rail waist and a detection method. The cable is welded to one end of the rail waist of the steel rail of a first block of the block device through a copper welding point, and a first flat-bottomed hole, a second flat-bottomed hole and a third flat-bottomed hole are formed in the cross section of the other end of the rail waist of the steel rail; and a first transverse through hole, a second transverse through hole and a third transverse through hole are formed in one end of the rail waist of the steel rail of a second block, and a fourth flat-bottomed hole, a fifth flat-bottomed hole and a sixth flat-bottomed hole are formed in the other end of the rail waist of the steel rail. By comparing with the defect-free first block welded with the cable, the condition that contourlets of the welding point are falsely judged as defect waves in detection can be avoided; by manufacturing a limited number of standard defects at specific positions of the block and comparing standard defect echo heights with actual defect echo heights, the defect equivalent sizes are determined; the defect positions are determined according to the defect echo positions, and cracks and spot defects in different directions are detected by means of different scanning modes; and operation is easy, and detection results are accurate.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection. More specifically, it relates to a rail ultrasonic testing test block device and a testing method for rail waist welding cables. Background technique [0002] Current sharing cables, return cables, freewheeling cables and signal cables in urban rail transit are mostly connected to rails by exothermic welding. Exothermic welding has a high instantaneous temperature during the welding process. If it is not operated properly, it will cause defects inside the rail and bring safety hazards to the operation of urban rail transit. Ultrasonic testing can effectively detect internal defects of rails, but due to the lack of suitable testing methods, missed and false detections occur from time to time. In the process of project acceptance and later track maintenance, it has brought many troubles to the construction unit and operation unit. [0003] At present, YB / T951-2014 "Rail Ultrasonic F...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rail ultrasonic detection test block device and detection method for rail waist welding cables to solve the technical problem of accurate positioning and quantification of defects in the rail welding area of ​​rail waist welding cables

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