What is NDT?

Varlowe Industrial Services News and PR from Varlowe Industrial Services - Published 02 June 2021 Non-Destructive Testing (NDT) is a way of testing and evaluating welds without destroying the component.
Using various testing methods, we can determine the physical properties of the materials.

The testing can show the material characteristics of its – strength, toughness, resistance, discontinuities and differences.

Dye Penetrant Inspection
Also called Liquid Penetrant Inspection (LPI). A cost-effective method used to detect surface defects on all non-porous materials.

The Inspection starts by spraying the surface with the Penetrant. The penetrant dries before applying the developer.

The developer draws into any cracks/defects by capillary action. In other words, it will present cracks, lack of penetration in welds/welding surface defects and surface porosity.

Dye Penetrant Inspection can be done on-site.

Ultra-Sonic Inspection
Ultra-Sonic Inspection uses high-frequency sound waves to detect discontinuities or changes in material characteristics.

Sound transmitted onto the object, which gets bounced back when a flaw gets found.

The flaw is then shown on the monitor for the technician to view.

Radiographic Inspection
This method uses the same principles as you would get when a doctor looks for fractured bones in a hospital.

Radiographic Inspection uses Gamma or X-rays on materials to detect flaws in welds and welded structures.

The flaws are projected onto film, which the qualified Radiographer can examine.

Magnetic Partial Inspection
Magnetic Particle Inspection uses a magnetic field that applies ferrous particles to the item’s surface under test.

Surface and near-surface defects affect the flow of the magnetic field. The disruption in flow causes the applied particles to attract to that area.

The attraction gives a visible sign of weakness found.

For more information on NDT, visit the Non-Destructive Testing article on Wikipedia.

Welding Services At Varlowe
If the project requires NDT, we arrange this through a third party company.

For more information about our coded welding services, please visit our Welding Services and Coded Welding page.
Ultra-Sonic Inspection uses high-frequency sound waves to detect discontinuities or changes in material characteristics

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