Non-destructive testing (NDT) technicians examine the physical properties of materials and components to detect corrosion, cracks, flaws and other imperfections which could lead to unreliability in product performance or in the worst case, product failure. They also inspect plant machinery to determine if maintenance is necessary. It is essential that the testing process itself does not have any detrimental effect on the material or plant under examination. Materials which are used for structures are tested at every stage to ensure that they are safe. For example, the materials used in aircraft manufacture are tested when they are made, while the fuselage is being constructed and throughout the operating life of the aircraft.

Non-destructive testing technicians use a variety of techniques to test materials, such as:

· visual examination - including the use of lenses, close circuit TV and fibre optic devices

· liquid dye penetrant testing - fluorescent liquids are used to stain surfaces which show up imperfections when viewed under ultraviolet lighting

· magnetic particle testing – magnetic particles are applied to magnetised ferrous materials, these then align along cracks and defects - often combined with liquid penetrant techniques

· radiographic testing – materials are X-rayed to show up internal defects

· ultrasonic testing - high frequency sound pulses are fired into materials and differences in reflected signals are interpreted for significance

NDT is also used as part of quality control processes, particularly in manufacturing. It covers a wide range of other industries including aerospace, defence, transport, power, shipping, steel, oil, gas and petrochemical.

Hands on experience in all those methods makes eligible for NDT LEVEL II Certification in which VIDAL NDT Institute is expertise.