Array ferromagnetic member surface defect detector based on leakage magnetic field double component

Abstract

The invention relates to the field of nondestructive testing, particularly to nondestructive detection equipment for defects, such as cracks, air holes, slag inclusions, stress concentrations, and the like, on the surface of a ferromagnetic member. The invention provides an array ferromagnetic member surface defect detector based on leakage magnetic field double component, which is capable of performing surface scanning to the surface of the member. The detector comprises a differential array leakage magnetic probe which is composed of a normal component detection hall sensor set and a tangential component detection hall sensor set that are used for detecting a normal component voltage signal and a tangential component voltage signal of the leakage magnetic field respectively, a signal conditioning circuit which is used for conditioning a voltage signal detected by the differential array leakage magnetic probe, and a data acquisition and processing unit which is used for analyzing the voltage signal output by the signal conditioning circuit and judging if the surface of the ferromagnetic member has a defect. The array ferromagnetic member surface defect detector based on the leakage magnetic field double component has large one-time detection area, quick detection speed, high detection accuracy and low omission ratio, and can provide the data required for quantitative analysis of the defects such as the crack and the like on the surface of the member.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to non-destructive detection equipment for defects such as surface cracks, pores, slag inclusions and stress concentration of ferromagnetic components. Background technique [0002] The existing disclosed ferromagnetic component surface crack detectors have different structures and methods, such as commonly used ultrasonic methods, ray methods, and electromagnetic methods. The ultrasonic method is relatively mature, but it requires high cleanliness on the surface of the workpiece, and it is cumbersome to implement; the ray method is not effective in detecting gradual defects and the radiation pollution is serious; the electromagnetic method includes magnetic particle method, eddy current method, and leakage method. Magnetic method, etc., but magnetic particle method and eddy current method are only suitable for surface or near-surface detection of materials. The degree of auto...

AI Technical Summary

Problems solved by technology

However, most of the existing crack detectors based on the magnetic flux leakage method are single probes, with a maximum of three probes, which are expensive and can only perform line scanning on the component surface. The one-time detection area is small, the speed is slow, and the detection is not accurate. Accurate, prone to missing inspections, and cannot provide the data support required for quantitative analysis of defects such as cracks on the surface of components, which seriously hinders the application of magnetic flux leakage in the field of nondestructive testing

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