A self-conforming eddy current detection device and method for corner cracks at the bottom of turnout rails

Abstract

The invention discloses a self-adaptive eddy current detection device and method for corner cracks in the bottom corner of a turnout rail. The unique design of the self-adaptive eddy current detection device for a small change in the corner shape of the bottom corner of a turnout rail adopts an electromagnetic eddy current array method and an orthogonal array eddy current The sensor's lift-off compensation function and non-directional detection feature realize the detection of crack defects on the bottom side of the turnout rail and the upper and lower surfaces.

Description

technical field [0001] The invention relates to a non-destructive testing device and method, in particular to a self-conforming eddy current testing device and method for corner cracks at the bottom edge of a turnout rail. Background technique [0002] Since the in-service turnouts (including standard rails) have been in the field for a long time, their surfaces are prone to corrosion and cracking. In addition, during the running of the train, the wheels have a strong impact on the rails, which can easily lead to turnouts. Defects such as fatigue cracks and wear, especially cracks that occur at the bottom of the turnout rail (including cracks on the side and upper and lower surfaces of the rail bottom). ACCIDENT. [0003] The currently commonly used ultrasonic testing method cannot accurately and efficiently solve the flaw detection problem of corner cracks at the bottom edge of turnout rails in service because it needs to clean the testing surface, and ultrasonic testing i...

AI Technical Summary

Problems solved by technology

[0002] Since the in-service turnouts (including standard rails) have been in the field for a long time, their surfaces are prone to corrosion and cracking. In addition, during the running of the train, the wheels have a strong impact on the rails, which can easily lead to turnouts. Defects such as fatigue cracks and wear, especially cracks that occur at the bottom of the turnout rail (including cracks on the side and upper and lower surfaces of the rail bottom). ACCIDENT

[0003] The currently commonly used ultrasonic testing method cannot accurately and efficiently solve the flaw detection problem of corner cracks at the bottom edge of turnout rails in service because it needs to clean the testing surface, and ultrasonic testing is not very sensitive to detecting surface defects.

Images