Magnetic Particle Testing (MT)

Magnetic particle testing is done by inducing a magnetic field in a ferromagnetic material and dusting the surface with Iron particles. Surface imperfections will distort the magnetic field and concentrate the iron particles near the imperfections, thus indicating their presence. *Indicates the minimum days of classes.

Training to Level I Duration: 3 days*
Training to Level II Duration: 3 days*
Training – Level II Refresher Duration: 3 days*
  • View Syllabus

    1.0 Principles of magnets and magnetic fields

    1.1 Theory of magnetic fields
    1.2 Earth’s magnetic field
    1.3 Magnetic field around magnetized materials
    1.4 Theory of magnetism
    1.5 Law of magnetism
    1.6 materials influenced by magnetic fields
    1.7 Ferromagnetic
    1.8 Paramagnetic
    1.9 Magnetic characteristics of nonferrous materials
    1.10 Terminology associated with magnetic particle testing

    2.0 Characteristics of magnetic fields

    2.1 Bar magnet
    2.2 Ring magnet

    3.0 Effect of discontinuities

    3.1 Surface cracks
    3.2 Scratches
    3.3 Subsurface defects

    4.0 Magnetization by means of electric current

    4.1 Circular field
    4.1.1 Field around a straight conductor
    4.1.2 Right hand rule
    4.1.3 Field in long, solid , cylindrical, regular parts
    4.1.4 Irregularly shaped parts
    4.1.5 Tubular parts
    4.1.6 Parts with machined slots and holes
    4.1.7 Method of inducing current flow in parts
    4.1.8 Contact plates
    4.1.9 Prods
    4.1.10 Dicontinuities commonly found with circular fields
    4.2 Longitudinal field
    4.2.1 Field produced by current flow in a coil
    4.2.2 Field direction in a current carrying coil
    4.2.3 Field strength in a current carrying coil
    4.2.4 Discontinuities commonly found with longitudinal fields
    4.2.5 Advantages of longitudinal magnetization
    4.2.6 Disadvantages of longitudinal magnetization

    5.0 Selecting the proper method of magnetization

    5.1 Alloy, shape and condition of part
    5.2 Type of magnetizing current
    5.3 Direction of magnetic field
    5.4 Sequence of operations
    5.5 Value of flux density

    6.0 Mediums

    6.1 Wet
    6.2 Dry

    7.0 Principles of demagnetization

    7.1 Residual magnetism
    7.2 Reasons for requiring demagnetization
    7.3 Longitudinal and circular residual fields
    7.4 Basic principles of demagnetization
    7.5 Retentivity and coercive force
    7.6 Methods of demagnetization

    8.0 Equipment selection considerations

    8.1 Type of magnetizing current
    8.2 Location and nature of test
    8.3 Test materials used
    8.4 Purpose of test
    8.5 Area inspected
    8.6 Manual inspection equipment
    8.7 Medium and heavy duty equipment
    8.8 Stationary equipment
    8.9 Mechanized inspection equipment
    8.10 Semiautomatic inspection equipment
    8.11 Multipurpose semiautomatic equipment
    8.12 Fully automatic equipment

    9.0 Types of discontinuities detected by MT

    9.1 Inclusions
    9.2 Blow holes
    9.3 Porosity
    9.4 Flakes

    NDTTECH recommended training time for Level I / II – 24 Hours ( 3 Days minimum)
    Recommended training references: (1) ASNT Handbook on MT (2) Magnetic Particle
    Testing hand book, Carl Betz (3) SNT TC 1A