案例研究

Magnetic Particle 测试 of Flanges

Magnetic Particle 测试 (MPT)

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Magnetic particle inspection is a method of detecting flaws in ferrous materials using magnetic fields. Surface 和 near-surface indications can be observed. This testing is best suited to magnetic materials, such as iron, nickel, cobalt, 和 their alloys. By inducing a magnetic field into the part 和 applying specially coated iron particles, surface or near-surface indications can be seen.

MPT can be applied to various forms of materials 和 components including billets, 酒吧, 油管, 铝型材, 铸件, 锻件, 紧固件, 和焊接件. All are commonly tested using magnetic particle inspection.

Depending on the application, wet or dry method can be used. In both methods the material is magnetically charged 和 iron particles are applied to the part for inspection of discontinuities. If a crack or defect is present, an opening in the material creates a leakage in the magnetic field, causing the particles to attract. This is like iron particles being attracted to the ends of a horseshoe magnet.

Key usage of MPT in the oil 和 气体 sector

im体育APP has decades of experience in providing a comprehensive range of oil 和 气体 testing services enabling critical materials to be tested, 检查, 和认证. We underst和 the complex challenges of transporting fuel 和 fluids in a reliable, 非常高效。, 安全的方式.

Magnetic particle testing supports upstream, 中游, 和 downstream markets to ensure the safety 和 integrity of production 和 storage infrastructure, 管道, 管道系统, 炼油厂, 和坦克.

By examining the nature, location 和 extent of an indication, our highly trained 和 experienced inspectors can determine the origin 和 cause of both surface 和 near-surface discontinuities. These evaluations are critical both before 和 after the materials are sold into production, ensuring the production cycle is consistent 和 safe.

The use of MPT for sample verification

Magnetic particle testing of two discharge connection samples

Magnetic particle inspection was used to determine the evidence of any surface or subsurface discontinuities on two discharge connection flange samples. The testing was performed on a Magnaflux H-700 unit using the wet fluorescent method.

The level II certified engineer visually 检查 the sample for any surface indications prior to testing 和 verified the current equipment calibration on both the machine 和 ultraviolet lamp to be used during the inspection. Black light intensity 和 white light were measured to verify ideal inspection conditions using a Gould-Bass DLM-1000 light meter.

The samples were placed between the headstocks of the machine 和 the continuous flow method was applied. The electrical current was introduced though the sample 和 fluorescent bath particles were introduced with the current engaged. A calibrated black light was used to inspect the sample for any signs of defects or indications.

No indications were found on the two samples. They were cleaned 和 demagnetized using A/C withdrawal method in a Magnaflux Demag Unit.

The samples were reported as acceptable to the client, which satisfied the sample requirement for that lot of parts.

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