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The classification of magnetic particle flaw detector o1, according to the different direction of magnetization of the workpiece, can be divided into circumferential magnetization method, longitudinal magnetization method, composite magnetization method and rotational magnetization method.
2, according to the use of different magnetizing current can be divided into: DC magnetization method, half-wave DC magnetization method, and AC magnetization method.
3, according to the detection of magnetic powder used in the preparation of different, can be divided into dry powder method and wet powder method.
The characteristics of magnetic particle flaw detectors employ a number of techniques to form induced magnetic fields, which are extremely versatile;
Controller and solid state electronics as one of the high-performance portable instrument;
Fixed AC or DC magnetic field for the detection of surface and near surface defects;
High-energy magnetic field can be concentratedly applied to the detection area to quickly and accurately find material defects;
Small size, light weight and reliable, use dry powder and wet fluorescent powder;
Magnetic pole can apply AC or DC magnetic field to the detection area of ​​various shapes of workpieces, no arc burn;
The scope of application of magnetic particle flaw detector o1, is suitable for detecting the surface and near surface of the ferromagnetic material workpiece size is very small, very narrow gap cracks and visually difficult to see the defects.
2. It is suitable for the detection of martensitic stainless steels and precipitation hardened stainless steels. It is not suitable for testing austenitic stainless steels.
3. Applicable to the detection of unprocessed raw materials (such as the blank) and the processed semi-finished products, finished parts and in-service and used workpieces.
4. It is suitable for the testing of steel and forged steel castings and welded parts for pipe and bar materials.
5, used to detect defects on the surface and near the surface, but not for the detection of shallow and wide defects on the surface of the workpiece, deeper buried internal defects and the direction of the direction of the magnetic flux and the included angle of less than 20 degrees.
The use of magnetic flaw detector
Description of Magnetic Flaw Detector The principle of magnetic particle flaw detector is that after the ferromagnetic material is magnetized, strong magnetic induction intensity will be generated in the interior of the magnetic particle flaw detector. The density of the magnetic flux density increases to several hundred times to several thousand times. The magnetic powder flaw detector detects discontinuity in the material. The magnetic lines of force may be distorted, and some lines of magnetic force may escape from the surface of the material, passing through the space to form a leakage magnetic field, and local magnetic poles of the leakage magnetic field can attract ferromagnetic substances. When the magnetic particle flaw detector measures, the magnetic powder is sprinkled on the workpiece, the magnetic leakage magnetic field will adsorb the magnetic powder, and the magnetic powder accumulation (magnetic mark) similar to the defect shape is formed, and the magnetic powder flaw detector displays defects;