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Penetrant testing (PT)

The penetrant testing is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics or ceramics). PT is used to detect casting, forging and welding surface defects. PT is used to detect casting, forging and welding surface defects. PT is based upon capillary action, where a low surface tension fluid penetrates into clean and dry surface-breaking discontinuities. Penetrant can be applied to the test component by dipping, spraying, or brushing. After adequate penetration time has been allowed, the excess penetrant is removed, a developer is applied. The developer helps to draw the penetrant out of the flaw where an invisible indication becomes visible to the inspector.

 

Inspection is performed under ultraviolet or white light, depending upon the type of dye used - fluorescent or nonfluorescent (colored). CEWAC posses a penetrant testing line able to detect very small defects and well adapted to series of small parts (aeronautics, nuclear, …) 

Application fields : 

  • Materials (steel, aluminium, copper and their alloys)
  • Welded parts
  • Verification of surfacing

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