LIQUID DYE PENETRANT TESTING

 The first of the surface methods is Liquid Penetrant Inspection. This method is used to  detect surface breakage and can be used on any material. Dye penetrant is most  frequently used if the material is non-magnetic.

 The test object is thoroughly cleaned then coated with a solution that contains either a  visible (colored) or fluorescent dye. Dye Test After sufficient time has elapsed for the  liquid to be drawn into any cracks, the excess solution is removed from the surface of  the object, leaving the dye in surface breaking defects. A second liquid, known as a  developer, is then applied to draw the penetrant out of the defects making them visible.

  Coloured penetrants require adequate white light to  be visible, while fluorescent dyes  require a darkened  room with the inspected part illuminated by ultraviolet  light making  the bleedout fluoresce brightly, thus  allowing imperfections to be readily seen. The red  indications in the photograph represent a number of  defects in this component.

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