NDT Methods

Your are either au fait with NDT and are interested in furthering your training, or maybe you have heard of NDT and would like to know more about it and how to progress into the field of NDT.

What is Non-Destructive Testing

Engineers design components and structures and these parts on completion will be subjected to physical tests until the component or structure breaks. The design engineers and the fracture mechanics engineers can now decide how these units can be improved and their working life can be extended. They could for example build an aircraft and once everything is satisfactory, put it into service.

Once the aircraft or component is put into service it is monitored to see how it is holding up to its working conditions and to assure that the material or structure is not deteriorating significantly – here non-destructive testing is used. In other words, the material, component or unit is inspected in such a way that its structural integrity is not at risk. Non-destructive testing is used to determine the condition of the material and to find any flaws which may have developed in-service before they reach the point where the failure occurs, which could have catastrophic results.

The methods used in non-destructive testing range through twelve different principles. Even though there are so many methods, there is no single method that will supersede another. They are often used in combination as complimentary to each other because each has its own specific applications.

SANDE offers training in the six main methods, namely

  • Radiographic Testing (RT)
  • Ultrasonic Testing (UT),
  • Magnetic Particle Testing (MT)
  • Liquid Penetrant Testing (PT)
  • Eddy Current Testing (ET)
  • Visual Inspection (Testing) (VT).

The other methods are :

  • Neutron Radiography
  • Thermography
  • Acoustic Emission
  • Leak Testing
  • Laser Testing
  • Vibration Analysis