Super strength magnetisation leakage detecting method and apparatus for magnetic conduction component

Abstract

The invention discloses a method and a device for detecting super-strong magnetized leakage of a conducting magnetic component. The method comprises the following steps: using a single feed-through magnetizing coil to locally, singly, axially and super-strongly magnetize the conducting magnetic component, exciting leakage field of longitudinal damage and transverse damage on the conducting magnetic component and picking up the leakage field by using a magnet-sensing element array, and achieving overall detection of the longitudinal damage and transverse damage; and distinguishing detected signals of the longitudinal damage and transverse damage through a signal summating comparison method and compensating the detected signals with signal amplitude, and achieving uniform judgment of the signal amplitude and the sensitivity of the longitudinal damage and transverse damage with equivalent damage. The device comprises the feed-through magnetizing coil, a magnet-sensing component, a signalidentifying and compensating component and a data collecting card. The method simplifies and unifies the prior detection method to reduce cost, achieves simple straight-forward relative scanning motion between the magnet-sensing component and a detection unit to finish flaw detection effectively at high speed, can finish overall detection of the longitudinal damage and transverse damage of the magnet-sensing component which is difficult to rotate, and can adapt to detection of longitudinal damage on a longitudinal weld.

Description

technical field [0001] The invention relates to a non-destructive detection technology for magnetic flux leakage of a magnetic conductive member, in particular to a method and device for detecting magnetic flux leakage of a magnetic conductive member with super strong magnetization. Background technique [0002] The magnetic flux leakage detection method is extended from the magnetic particle detection method. The initial magnetization method is the residual magnetization method, and the magnetization state of the detected magnetic conductive member is very weak; the subsequent direct conventional magnetization method strengthens the magnetization state of the detected magnetic conductive member and enhances the indication of the defect, but there is a defect direction Detectability issues related to the magnetization direction: the magnetization direction is as perpendicular as possible to the defect direction so that it can be detected and observed well. Therefore, at pre...

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Problems solved by technology

The initial magnetization method is the residual magnetization method, and the magnetization state of the detected magnetic conductive member is very weak; the subsequent direct conventional magnetization method strengthens the magnetization state of the detected magnetic conductive member and enhances the indication of defects, but there is a defect direction Detectability issues related to the magnetization direction: the magnetization direction is as perpendicular as possible to the direction of the defect so that it can be well detected and observed

Therefore, at present, the comprehensive detection of all-round damage on the magnetic conductive member can only be completed by the composite magnetization magnetic flux leakage detection method. High-speed detection cannot be achieved

In addition, it cannot adapt to the comprehensive detection of damage in all directions on the magnetic components (such as coiled tubing, steel belt, kelly, rail, etc.) detection of injuries

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