1.1 This standard describes the procedure for magnetic particle testing and inspection of ferromagnetic steel forgings.
1.2 Magnetic partic'e testing provides for the detection of cracks and other discontinuities situated at or near the surface in ferromagnetic materials. The sensitivity of the test is maximum for surface discontinuities and diminishes rapidly with depth below the surface.
1.3 This standard does not stipulate any requirements for the acceptance or rejection of forgings on which flaws have been revealed. This shall be subject to mutual agreement between the contracting parties. This agreement may include the following:
a) A statement specifying that the forgings shall be subject to magnetic particle testing and inspection in accordance with this standard together with any additional requirements considred necessary;:
b) The locations on the forgings which are to be subjected to magnetic particle testing and inspection;
c) The stage of manufacture at which the test is to be conducted, the technique to be used and the magnetizing field or current strength to be employed; and
d) The type of discontinuities to be considered undesirable.
IS 7743-1975 history
1975IS 7743-1975 Recommended Practice for Magnetic Particle Testing and Inspection of Steel Forgings