Non-Destructive Testing is a blanket term used to describe various methods used to examine metal components such as shafts, mills, gears, bearings, steel plates and pipes for defects and cracks
without destroying or damaging the item that is being inspected.
These methods include:
Ultrasonic testing (UT)
* Wall thickness testing
* Phased Array testing
* Radiographic testing (RT)
* Magnetic particle testing (MPI)
* Dye Penetrant Testing (DPI)
* Hardness testing (HT)
* Visual Inspection
* Spark testing
DYE PENETRANT TESTING
This is a quick, reasonably affordable way of testing components for surface
defects. It is used with a color penetrant that is applied to the specimen; then it is cleaned off and dried. A developer is then applied, which draws the colour penetrant out of the defect or crack. This can then
be visually interpreted to International standards.