When a magnetic field cuts through metal, a current is induced. If a magnetic field cuts a wire in a closed circuit, a current is induced round the circuit. However if a magnetic field cuts through a sample of metal that is not connected to a circuit, an Eddy Current is produced. This eddy current is localized in the metal and has a flow pattern. The flow pattern is disturbed by discontinuities from the surface to a shallow depth of penetration. The method is quick and very sensitive. No contact with the metal is required. All metals may be subject to this form of testing.

This course is orientated towards candidate NDT inspectors.

PRACTICE

·         Acquaintance with the relevant equipment

·         Practice with coils

·         Practice with weld samples

·         Location and assessment of discontinuities

·         Report

THEORY

·         Review of electromagnetic theory

·         Factors that affect coil impedance and flux leakage fields

·         Signal to noise ratio

·         Selection of test frequency

·         Selection of method of magnetization for flux

·         Leakage testing

·         Coupling

·         Field strength and its selection

·         Field orientation for flux leakage testing

·         Relevant standards

·         Reporting method

·         Assessment of discontinuities

EXAMINATIONS

With the completion of the training the candidate can sit the examinations for certification according to SNT-TC-1A. Training and Examinations shall be done in English only.

DURATION

80 Hours

Night Class available as optional.