Choosing a magnetic particle inspection method

Lovejoy, David

doi:10.1007/978-94-011-1536-0_9

Cited by 4 publications

(7 citation statements)

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“…The principle of MPI is that magnetic lines of force are induced either by a magnet, electromagnet or an electric current that creates a magnetic field in the component. 37 The applied electric current can be either a direct current (DC) or an alternating current (AC). However, the use of DC increases the probability of detecting narrow cracks underneath the surface.…”

Section: Visual and Optical Testingmentioning

confidence: 99%

“…The magnetic particles can be coloured to enhance the contrast of the visual inspection. 37,39 Commonly used particles include black iron, red and yellow iron oxides. Using a fluorescent dye coated on a magnetic particle has also been reported.…”

Section: Visual and Optical Testingmentioning

confidence: 99%

“…40 The magnetisation techniques depend on the component shape and size, which can be categorised into DC and magnetic flux flow techniques. 37 In the DC technique, the magnetic field is created by the flow of current through the component, whereas in the magnetic flux flow technique, the magnetic flux is induced in the component using a permanent magnet or by flowing current through a coil or a conductor. 41 MPI is often used to detect cracks at welded joints, stress corrosion cracking, hydrogen-induced cracks, fatigue cracks and creep cracks, which are surface phenomena.…”

Section: Visual and Optical Testingmentioning

confidence: 99%

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Non-destructive techniques for corrosion detection: A review

Vasagar,

Hassan,

Abdullah

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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Corrosion detection (CD) has become a high priority in chemical industries, defense and transportation sectors to extend the life of existing or new systems while ensuring the safety of the existing components and reducing downtime to minimise economic losses. Here, this article is aimed to review and discuss non-destructive techniques used widely in the industry to detect, monitor and repair corrosion problems early on. The comprehensive review provides a detailed discussion, a functional mechanism, advantages and disadvantages of crucial non-destructive CD techniques widely used in the industry, helping the reader choose the type of corrosion monitoring methods effectively. An extensive literature review of visual and optical testing techniques, acoustic emissions, eddy current, guided wave and equipment, infrared thermography, radiographic, microwave and millimeter wave, and terahertz imaging is discussed. The underlying mechanism, its merits and limitations, along with the usage scenario, is explained that can be related across different areas making it interdisciplinary research for corrosion monitoring techniques.

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Section: Visual and Optical Testingmentioning

confidence: 99%

Section: Visual and Optical Testingmentioning

confidence: 99%

Section: Visual and Optical Testingmentioning

confidence: 99%

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Non-destructive techniques for corrosion detection: A review

Vasagar,

Hassan,

Abdullah

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…Partikel magnet basah diaplikasikan ke bagian yang diinspeksi. Bagian tersebut kemudian diperiksa di bawah sinar UV untuk menunjukkan adanya retakan di fluktuasi medan magnet (Lovejoy, 2012).…”

Section: • Magnetic Particle Inspectionunclassified

Pencegahan Korosi Pada Pabrik Kelapa Sawit

Nasution¹,

Nasution²,

Lydiasari³

et al. 2022

war

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Korosi dapat didefinisikan sebagai berkurangnya logam yang diakibatkan oleh interaksi psikokimia antara logam dan lingkungannya. Korosi juga terjadi di pabrik kelapa sawit yang mengakibatkan kegagalan pada komponen-komponen mesin proses. Beberapa jenis mekanisme korosi yang terjadi di pabrik kelapa sawit di antaranya elektrokimia, kimia, biologi, dan kimia-mekanik. Oleh karena itu, dibutuhkan pencegahan korosi untuk meminimalisir biaya dan kerugian akibat gagalnya komponen akibat korosi. Untuk mencegah terjadinya kegagalan pada pabrik kelapa sawit akibat terjadinya korosi, maka dibutuhkan penanganan dan pencegahan korosi dengan melakukan pemilihan material yang tepat, modifikasi media korosif, pelapisan dan pengecekan berkala. Pengecekan berkala dilakukan dengan menggunakan metode pengujian tidak merusak (non destructive test) yang terdiri dari ultrasonic testing, magnetic particle inspection dan dye penetrant inspection untuk memperpanjang umur penggunaan dan menghindari kegagalan komponen akibat korosi.

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“…For the experiments containing no discontinuities, alternating current (AC) magnetization was used because of its ability to detect surface-breaking discontinuities. For the experiments containing manufactured sub-surface defects, direct current (DC) magnetization was used because of its ability to detect sub-surface discontinuities [9]. After all the samples were tested, image processing was utilized.…”

Section: Mpi Parametersmentioning

confidence: 99%

Development of an Image Analysis Protocol to Define Noise in Wet Magnetic Particle Inspection

2021

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This study presents a novel method to quantify the effectiveness of wet magnetic particle inspection (MPI) when detecting possible defects. Wet MPI is an established method utilizing magnetic fields to locate possible areas of defects in ferromagnetic parts. The capability of this method has been evaluated in the past most notably using the probability of detection (POD) graphs. However, MPI requires a large amount of data and is subjective because it is based on human operators' evaluation. The method proposed in this paper is an objective method to determine the effectiveness of the MPI test based on how well discontinuities can be delineated in the image. This approach utilizes the intensity of the particle illumination in the defect area and compares it to its surroundings. This analysis generates a value to objectively represent how well a discontinuity can be identified. This method was then used to validate the effect of surface roughness on the effectiveness of wet MPI using two experiments. The first experiment was conducted to test for the collection of particles on varying surface roughness levels, and the second experiment was used to evaluate the effect of surface roughness when detecting a subsurface discontinuity. Results indicate that there is a significant increase in particle collection as roughness increases and as the surface roughness increases, the harder it is to locate discontinuities. This method provides a quantitative measure that could be used to aid parameter selection.

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Choosing a magnetic particle inspection method

Cited by 4 publications

References 0 publications

Non-destructive techniques for corrosion detection: A review

Non-destructive techniques for corrosion detection: A review

Pencegahan Korosi Pada Pabrik Kelapa Sawit

Development of an Image Analysis Protocol to Define Noise in Wet Magnetic Particle Inspection

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