Non destructive testing

MPI & DPI  Non Destructive Testing to ;  ASNT Level II & PCN Level 2 Qualification

Magnetic Particle Inspection

 

Magnetic Particle Inspection (MPI), also sometimes called Magnetic Test (MT) is a non-destructive test method for the detection of surface and sub-surface discontinuities in ferrous materials.

 

The test method involves the application of a magnetic field externally or applying an electric current through the material which in turn produces magnetic flux. Simultaneously, visible ferrous particles are sprinkled or sprayed on the test surface. The presence of a surface or near surface discontinuity in the material causes distortion in the magnetic flux which in turn causes leakage of the magnetic fields. The magnetic particles are attracted by the surface field in the test area and adhere to the edges.

 

There are several methods of magnetising the test parts.  

Penetrant Examination

 

 

Dye Penetrant Inspection (DPI), also called Liquid Penetrant Inspection (LPI) or Penetrant Test (PT), is a fast, economical and widely used non-destructive test method to detect surface-breaking discontinuities in all non-porous materials (metals, plastics, or ceramics).

 

A penetrant test is based upon the principles of capillary action where liquid penetrates into a cavity. It is performed by cleaning the test surface thoroughly, applying a coloured or fluorescent penetrant, allowing penetration time, removal of excess penetrant followed by application of developer ( dry or liquid form). The developer assists to draw penetrant out from the surface breaking discontinuities. After developer dwelling, the test surface is examined for bleed out under natural light or black (UV) light (depending on the type of penetrant).

 

Fluorescent Dye Penetrant Inspection (FDPI) is the most sensitive test method.


 
 
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