On the Possibility of In-Process Magnetic Detection of Flaws in Rails

A procedure has been developed to detect surface defects in the head and foot of a rail using a magnetic method involving thin-film magnetoresistive field sensors. The setup consists of a system for moving the rail in the longitudinal direction, a magnetizing solenoid, cartridges with field sensors...

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Bibliographic Details
Published in:Russian journal of nondestructive testing 2019-12, Vol.55 (12), p.942-948
Main Authors: Shleenkov, A. S., Bulychev, O. A., Pastukhov, A. B., Shleenkov, S. A.
Format: Article
Language:English
Subjects:
Analog to digital conversion
Analog to digital converters
Cartridges
Characterization and Evaluation of Materials
Chemistry and Materials Science
Defects
Electromagnetic Methods
Flaw detection
Magnetic methods
Magnetoresistivity
Materials Science
Sensors
Signal processing
Solenoids
Structural Materials
Surface defects
Technical information
Thin films
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Summary:A procedure has been developed to detect surface defects in the head and foot of a rail using a magnetic method involving thin-film magnetoresistive field sensors. The setup consists of a system for moving the rail in the longitudinal direction, a magnetizing solenoid, cartridges with field sensors for inspecting the rail head and foot, a DC electromagnet with attached pole pieces, and a “robotic” transverse movement unit with an additional cartridge for revealing long-sized defects (over the entire length of the rail). The electrical signals of the sensors are transmitted to an analog-to-digital converter and processed digitally. The possibility of detecting all surface defects stipulated by the regulatory and technical documentation of JSC Russian Railways is demonstrated.
ISSN:1061-8309
1608-3385
DOI:10.1134/S1061830919120118