Non-Destructive testing (NDT for short) is a way of testing and evaluating welds without destroying the component. Using a variety of testing methods, we are able to determine the physical properties of the materials such as strength and toughness, resistance, discontinuities and differences in material characteristics.
Dye Penetrant Inspection
Also called Liquid Penetrant Inspection (LPI), is a cost effective method used to detect surface defects on all non-porous materials. The inspection is done by spraying the surface with the Penetrant, which is allowed to dry before applying the developer. The developer is then drawn into any cracks/defects by capillary action. This can detect cracks, lack of penetration in welds/welding surface defects and surface porosity. This method can be done on site.
Using high-frequency sound waves to detect discontinuities or changes in material characteristics. Sound is transmitted onto the object which gets bounced back when a flaw is found. This is then shown on the monitor for the technician to view.
This method uses the same principles as you would get when a doctor looks for fractured bones in hospital. Using gamma rays or X-rays on materials to detect flaws in welds and welded structures. It is projected onto film which can be examined by the qualified Radiographer.
Magnetic Partial Inspection
This is done by using a magnetic field and applying ferrous particles to the surface of the item under test. Surface and near surface defects affect the flow of the magnetic field causing the applied particles to be attracted to that area. This gives a visible indication of a defect found.
More information about NDT methods can be found here
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