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    Batch 8 INDUSTRIAL METALLURGY

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    pericharla ravivarma
    This document provides an overview of magnetic particle inspection, a nondestructive testing method used to detect surface or near-surface flaws in ferromagnetic materials. It describes the basic principles of magnetizing a material and applying iron particles that collect at areas of magnetic flux leakage, revealing discontinuities. The document outlines the typical sequence of the inspection process, including cleaning, magnetization, particle application, viewing indications, and demagnetization. It also lists some advantages like quick results and portability, and disadvantages such as the need for ferromagnetic test materials and current supply.

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    Batch 8 INDUSTRIAL METALLURGY

    Uploaded by

    pericharla ravivarma
    19 views9 pages
    This document provides an overview of magnetic particle inspection, a nondestructive testing method used to detect surface or near-surface flaws in ferromagnetic materials. It describes the basic principles of magnetizing a material and applying iron particles that collect at areas of magnetic flux leakage, revealing discontinuities. The document outlines the typical sequence of the inspection process, including cleaning, magnetization, particle application, viewing indications, and demagnetization. It also lists some advantages like quick results and portability, and disadvantages such as the need for ferromagnetic test materials and current supply.

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    batch 8 INDUSTRIAL METALLURGY

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    This document provides an overview of magnetic particle inspection, a nondestructive testing method used to detect surface or near-surface flaws in ferromagnetic materials. It describes the basic principles of magnetizing a material and applying iron particles that collect at areas of magnetic flux leakage, revealing discontinuities. The document outlines the typical sequence of the inspection process, including cleaning, magnetization, particle application, viewing indications, and demagnetization. It also lists some advantages like quick results and portability, and disadvantages such as the need for ferromagnetic test materials and current supply.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    19 views9 pages

    Batch 8 INDUSTRIAL METALLURGY

    Uploaded by

    pericharla ravivarma
    This document provides an overview of magnetic particle inspection, a nondestructive testing method used to detect surface or near-surface flaws in ferromagnetic materials. It describes the basic principles of magnetizing a material and applying iron particles that collect at areas of magnetic flux leakage, revealing discontinuities. The document outlines the typical sequence of the inspection process, including cleaning, magnetization, particle application, viewing indications, and demagnetization. It also lists some advantages like quick results and portability, and disadvantages such as the need for ferromagnetic test materials and current supply.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 9

    INDUSTRIAL METTALURGY

    ASSIGNMENT

    TOPIC: Magnetic particle testing


    BATCH-8
    BATCH MEMBERS:
    Pericharla Ravivarma (18m637)
    Poovinan.A (18M638)
    Pranesh.B.K (18M639)
    Praveen Kumar. R (18M640)
    Raghul.S (18M641)
    MAGNETIC PARTICLE INSPECTION: A BRIEF INTRODUCTION
     Magnetic particle inspection is a nondestructive inspection method that provides detection of
    linear flaws located at or near the surface of ferromagnetic materials.
     It is viewed primarily as a surface examination method.

    Live animation of the process.


    BASIC PRINCIPLE OF THE PROCESS:
     This method involves the magnetization of an area to be examined and the application of
    ferromagnetic particles to the surface.  The particles gather at areas of magnetic flux leakage
    and form indications characteristic of the type of discontinuity detected.
     Maximum sensitivity is achieved when linear discontinuities are oriented perpendicular to the
    lines of flux.     

    Figure depicts the basic principle involved in the process


    OVER-VIEW OF THE PROCESS
     Surface preparation
     Initial demagnetization
     Magnetization
     Application of magnetic particles
     Viewing
     Marking of defects
     Demagnetization
     Removal of ink from component
    SEQUENCE OF THE PROCESS:

     The component to be tested is cleaned first.

    Reason:
     Oil or grease presence disturb the process and prevent the attraction of
    magnetic particle to leakage field.
     Contamination also interfere with interpretation of indications.

    Pre-cleaning process
     After cleaning , the specimen can be magnetized directly or indirectly.
     Direct magnetization occurs when electric current is passed directly
    through specimen.

    Direct magnetization

    In indirect magnetization, magnetic field is applied is applied using a strong external magnetic
    field without passing current.

    Indirect magnetization
     Indirect magnetization can be performed using permanent magnets or electromagnets.
     Usage of electro magnets are more preferable over the permanent magnets.
     Reason: Due to lack of control of the field strength and the difficulty of placing and removing
    strong permanent magnets from the component.
     Electromagnet consists of coil of wires through which current is supplied to produce magnetic
    field.
     Magnetic flux created, is used to detect flaws in specimen.

    ELECTROMAGNET
     Flux lines running along the surface will deviate from the path, if it approaches a crack.

    Animation of flux deviations in the process

     Fine magnetic particles are applied to surface of specimen for visible indication of cracks.
     These fine magnetic particles are attracted to are of flux deviation creating a visible indication
    of flaw.
    ADVANTAGES VS DISADVANTAGES OF THE PROCESS

    ADVANTAGES
    The process is quick and mostly not complicated, so
    DISADVANTAGES
    It can only be used for ferromagnetic materials.
    moderate skill is required.

    The results are immediate. The process could be very messy.

    The surface must be clean, but not as much critical Need a mandatory current supply.
    as dye penetrant inspection.

    Process is portable.so, it can be used in work shops Most of the time, paint will have to be removed
    and sites. prior to inspection.

    It is an inexpensive method. Demagnetization and post cleaning is sometimes a


    requirement.

    Small or large items can be inspected very quickly. Magnetic field can damage other instruments.

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