Magnetic particle detection is still applicable to the detection of semi-finished products

In industry, magnetic particle inspection is used as the final inspection of the finished product to ensure that the surface of the workpiece is free of harmful defects after various processing processes (such as welding, metal heat treatment, grinding). Magnetic particle inspection can also be used for the inspection of semi-finished products and raw materials, such as bars, billets, forgings, castings, etc., to find surface defects. Railway, aviation and other transportation departments, smelting, chemical, electric power and various machinery manufacturing enterprises.

Non-destructive magnetic particle inspection is very effective for detecting defects such as cracks on the surface of steel materials or workpieces. Simple equipment and operation; The detection speed is fast, which is convenient for on-site detection of large equipment and workpieces. Inspection costs are also lower. It only applies to ferromagnetic materials; Only the length and shape of the defect can be seen, but it is difficult to determine its depth; Some workpieces that have an effect on remanence also need to be demagnetized after magnetic particle detection. Although the magnetic particle flaw detection sensitivity is high, it is convenient to operate. However, parts of bed castings and materials with poor permeability (such as austenitic steel) cannot be found, nor can deep defects be found in parts of castings. The surface of castings and steel should be smooth and polished.

For magnetic particles, it acts as a display medium.

The first is black magnetic powder, which is divided into iron oxide (Fe3O4), black magnetic powder, suitable for the background light is bright or bright workpiece. Then there is the red magnetic powder, his composition is iron trioxide (Fe2O3), is an iron red magnetic powder, suitable for the background of dark workpieces. The second is the fluorescent magnetic powder, which is coated with a fluorescent material in the magnetic powder particles of ferrotetroxide, and can emit yellow-green fluorescence under ultraviolet radiation. Suitable for workpieces with dark background. Especially because of the sensitivity of the human eye to color, the magnetic particle test with fluorescent magnetic powder as the magnetic medium has higher sensitivity than other magnetic powders. Finally, the white magnetic powder is coated with a white material in the trioxide magnetic powder particles. Suitable for workpieces with dark background.

Magnetic particle flaw detection is a work that uses the interaction between magnetic flux leakage and magnetic particle at the workpiece defect. It depends on the difference between the permeability of surface and near-surface defects (such as cracks, slag inclusion, hair strands, etc.) of steel products and the permeability of steel. After these materials are magnetized, the magnetic field at the discontinuity will be distorted, forming a partial magnetic leakage on the surface of the workpiece.

For the inspection of semi-finished products, the magnetic turnover detector is also very good

Magnetic particles form an accumulation of magnetic particles at the defect magnetic mark, and then, under appropriate lighting conditions, reveal the location and shape of the defect, observe and interpret the accumulation of magnetic particles, and achieve magnetic particle detection.

In industry, magnetic particle inspection is used as the final inspection of the finished product to ensure that the surface of the workpiece is free of harmful defects after various processing processes (such as welding, metal heat treatment, grinding). Magnetic particle inspection can also be used for the inspection of semi-finished products and raw materials, such as bars, billets, forgings, castings, etc., to find surface defects. Railway, aviation and other transportation departments, smelting, chemical, electric power and various machinery manufacturing enterprises.

The fluorescent magnetic particle flaw detection machine is very effective for detecting defects such as cracks on the surface of steel materials or workpieces. Simple equipment and operation; The detection speed is fast, which is convenient for on-site detection of large equipment and workpieces. Inspection costs are also lower. It only applies to ferromagnetic materials; Only the length and shape of the defect can be seen, but it is difficult to determine its depth; Some workpieces that have an effect on remanence also need to be demagnetized after magnetic particle detection.

Although the magnetic particle flaw detection sensitivity is high, it is convenient to operate. However, parts of bed castings and materials with poor permeability (such as austenitic steel) cannot be found, nor can deep defects be found in parts of castings. The surface of castings and steel should be smooth and polished.

For magnetic particles, it acts as a display medium.

The first is black magnetic powder, which is divided into iron oxide (Fe3O4), black magnetic powder, suitable for the background light is bright or bright workpiece.

Followed by red magnetic powder, his composition is iron trioxide (Fe2O3), is an iron red magnetic powder, suitable for the background of dark workpieces.

Then there is the fluorescent magnetic powder, which is coated with a fluorescent material in the magnetic powder particles of ferrotetroxide, and can emit yellow-green fluorescence under ultraviolet radiation. Suitable for workpieces with dark background. Especially because of the sensitivity of the human eye to color, the magnetic particle test with fluorescent magnetic powder as the magnetic medium has higher sensitivity than other magnetic powders.

Finally, the white magnetic powder is coated with a white material in the trioxide magnetic powder particles. Suitable for workpieces with dark background.

Magnetic particle detection is a work based on the interaction between magnetic flux leakage and magnetic particle at the workpiece defect. It depends on the difference between the permeability of surface and near-surface defects (such as cracks, slag inclusion, hair strands, etc.) of steel products and the permeability of steel. After these materials are magnetized, the magnetic field at the discontinuity will be distorted, forming a partial magnetic leakage on the surface of the workpiece.

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