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Zuuk Inspection, more commonly known as ZNDT, specializes in phased array ultrasonic testing [or PAUT]. PAUT is based on principles of wave physics. The term phased refers to the timing, and the term array refers to the multiple elements. This volumetric inspection method has become more popular in recent years due to its accuracy and safe application.
Unlike conventional and automated ultrasonic testing, which is performed for fixed angles of 45, 60 and 70 degrees, PAUT can cover all angles in this range simultaneously. This is significant as a single phased array inspection can cover all angles from 40 to 75 degrees, and displays the image in real time. The real-time image is a direct superimposition of the ultrasonic illumination on the test piece and is easy to interpret. Using swept angle S-scans, PAUT requires smaller surface distance for inspection compared to AUT or manual UT. PAUT can cover a large cross-section of the test piece from a single probe location. PAUT has proven its ability to detect weld flaws such as: toe cracks, center line cracks, lack of fusion, lack of penetration, slag and porosity. Additionally, the ability of PAUT to minimize the focal spot size at a defect location has allowed for increased accuracy of flaw sizing.
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