Nondestructive testing methods

Nondestructive testing methods are those which don't modify the materials during the testing, so they can be used to test 100% of end products.

There are different types of NDT methods such as:

  • Eddy current (mainly for surface quality and physical properties)
  • Vision (when the surface can be accesed by humans or cameras)
  • Ultrasonics
  • X-Ray
  • Magnetic particles
  • Penetrant liquids

 

    • Use
      • Surface and subsurface discontinuities
      • Changes in hardness or conductivity near the surface
      • 100% of the production need to be tested
      • Materials can't be directly accessed by people

     

    • Advantages
      • Recognized method for most of the standards and codes
      • Repetitiveness
      • Sensitiveness
      • Reliability
      • Can be easyly adopted
      • Low cost
      • Doesn't need human extensive participation

    It's the best method for surface testing

    • Use
      • Surface discontinuities
      • Materials can be accessed by people or by cameras

     

    • Advantages
      • Intuitiveness (easy to understand the results)
      • Can be easyly adopted

    However it's very dependent on environmental conditions such us surface conditions, light and floating particles

    • Use
      • Internal discontinuities

     

    • Advantages
      • Recognized method for most of the standards and codes
      • Repetitiveness
      • Can be easyly adopted

    However it's an expensive method and it has an extensive couplant consumption

    • Use
      • Surface discontinuities
      • Materials can be directly accessed by people
      • Only statistics samples are necessary to be tested

     

    • Advantages
      • Intuitiveness

    However it's a dirty method and needs human execution

    • Use
      • Surface discontinuities
      • Materials can be directly accessed by people
      • Only statistics samples are necessary to be tested

     

    • Advantages
      • Intuitiveness

    However it's a dirty method and needs human execution

    • Use
      • Internal discontinuities
      • Materials surfase can be directly accessed by people
      • Discrete production

     

    • Advantages
      • Intuitiveness
      • Reliability
      • Accuracy

    However it's a dangerous and very expensive method

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