Dye Penetrant Testing

Dye Penetrating Testing

Penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials.

PT is used to detect casting, forging, and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components. 

In penetrant testing, a liquid with high surface wetting characteristics is applied to the surface of a component under test. The penetrant “penetrates” into discontinuities that are open to the surface via capillary action and other mechanisms.

Excess penetrant is removed from the surface and the developer is applied to pull out trapped penetrant back the surface. Thus defect detected by color contrast between indication & background.

Get multiple types of Dye Penetrating Testing:

  • Visible Penetrant Testing
  • Solvent Removable (Visible) Testing
  • Water Washable (Visible) Testing
  • Water-based (Fluorescent) Testing
  • Water washable Penetrant Testing
  • Solvent-based (Fluorescent) Testing
  • Post-emulsifiable, Lipophilic (Fluorescent) Testing
  • Post-emulsifiable, Hydrophilic (Fluorescent) Testing
  • Fluorescent Penetrant Testing

Advantages of Dye Penetrating Testing

  • Ease of use
  • It can be used on a wide range of materials
  • Large areas/volumes of parts/materials can be inspected quickly at a low cost
  • Parts with complex geometries are routinely inspected at our facility
  • Indications are produced directly on the surface of the part providing a visual image of the discontinuity
  • Initial equipment investment is low
  • Aerosol spray-cans can make the equipment very portable
Patels Radiography Services
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