Method for compound magnetic powder flaw detection

A magnetic particle flaw detection and composite technology, applied in the direction of material magnetic variables, can solve the problems of uneven magnetic field distribution, burnt workpiece, spark phenomenon, etc., to avoid burn workpiece, reduce labor intensity, and avoid spark phenomenon.

Inactive Publication Date: 2010-08-18
SHEYANG SAIFU NDT EQUIP MFG
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  • Abstract
  • Description
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Problems solved by technology

However, the circumferential detection of this method is that the workpiece itself is directly energized, which is prone to sparking and burns the workpiece; the longitudinal detection method is also prone to uneven magnetic field distribution due to the different shapes of the workpiece, resulting in missed detection.

Method used

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  • Method for compound magnetic powder flaw detection
  • Method for compound magnetic powder flaw detection
  • Method for compound magnetic powder flaw detection

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Embodiment Construction

[0017] The technical characteristics of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] A composite magnetic particle flaw detection method, comprising the following steps: (1) pretreatment; (2) magnetization; (3) applying magnetic powder or magnetic suspension; (4) observation and recording of magnetic marks; (5) defect rating; 6) demagnetization; (7) post-processing; the magnetization method in the step (2) is the full induction type of the circumferential closed yoke magnetization and the longitudinal coil magnetization.

[0019] Such as figure 1 The schematic diagram of the closed yoke is shown, and it can be seen from the figure that the magnetization detection method adopts the method of applying a magnetic field to the broadband closed yoke 1, and the workpiece is used as a conductor to generate a closed magnetic circuit, and the workpiece is magnetized in the circumferential directio...

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Abstract

The invention discloses a method for compound magnetic powder flaw detection, comprising the following steps: (1) pretreating; (2) magnetizing; (3) applying magnetic powder or magnetic suspension; (4) observing and recording a magnetic trace; (5) rating the flaw; (6) demagnetizing; and (7) post-treating. The magnetizing mode in the step (2) is circumferential closed magnet yoke magnetization and coil magnetization full sensing. The magnetic powder flaw detection method designed by the technical scheme of the invention has the advantage of high work efficiency, lightens the labor intensity of workers, avoids fire striking phenomenon, does not burn workpieces and has even magnetic field distribution.

Description

technical field [0001] The invention relates to a composite magnetic particle flaw detection method, specifically a composite magnetic particle flaw detection method for circumferential broadband closed-circuit (open-circuit) yoke induction and longitudinal induction in steel pipes, drill pipes and shaft products, and the related device. Background technique [0002] The basic principle of magnetic particle testing is to use the principle of leakage magnetic field. Using the superposition of two external magnetic fields to form a non-stop rotating magnetic field is applied to the surface of the workpiece. In the defects of the workpiece, the magnetic force lines cannot pass through conveniently, thus forming magnetic flux leakage, and forming magnetic poles in the defects. The magnetism is strengthened, and the magnetic powder is adsorbed objectively. Shows the shape and size of the defect. Since the external magnetic field is a non-stop rotating magnetic field, one inspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/84
Inventor 杨建
Owner SHEYANG SAIFU NDT EQUIP MFG
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