Nondestructive flaw detection device for metal wire/pipe

Abstract

The invention discloses a nondestructive flaw detection device for a metal wire / pipe. The device comprises a measurement coil and a magnetic field coil that are mutually nested. The magnetic field coil is connected to a power source, and an amplifier is connected to the measurement coil and transmits the measurement signal to a frequency analyzer and a current / voltage converter respectively. The nondestructive flaw detection method includes the steps of: (1) energizing the magnetic field coil by the power source to form an electromagnetic field; (2) establishing measurement standards, passing the to-be-measured metal wire / pipe through the magnetic field coil and the measurement coil to do longitudinal motion, performing real-time measurement and induction of the frequency information and current / voltage information of a coil measurement signal, and selecting a most stable frequency value and current / voltage value as standard values; and (3) repeating the longitudinal motion of the to-be-measured metal wire / pipe along the coils, conducting real-time measurement of frequency information and current / voltage information and performing comparison with the standard values, when the difference between the measured frequency or current / voltage value and the standard values is more than + / -10%, emitting alarm information by an alarm prompt module. According to the invention, by measuring the magnetic field change signals when different positions of the to-be-measured member stretch into a high frequency magnetic field, whether a position has a flaw can be determined, thus realizing relative measurement of the quality defect of the whole to-be-measured member. The measurement method is simple, and the result is reliable.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of materials, and in particular relates to a device and method for non-destructive testing of metal wires / pipes. Background technique [0002] Metal pipe or wire is an extremely common raw material used in industrial production materials. The production of metal pipes or wires is usually made by melting the metal through a high-temperature furnace and casting it into shape. In the process of casting metal crystals into wires, the quality of the wires along its length is not perfect, and there are always more or less defects. How to realize the non-destructive detection of the external and internal defects of the wire is the key to judging the quality of the wire. [0003] At present, five types of methods are usually used for flaw detection in the field of non-destructive testing: ray, ultrasonic, eddy current, magnetic particle (magnetic flux leakage, magnetic memory) and penetra...

AI Technical Summary

Problems solved by technology

Metal wires with different defects will cause changes in the parameters of the induced magnetic field signal in a high-frequency changing magnetic field

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