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Advantages of Compound S-scan over Sectorial Scan or E-scan: A Case Study

Within PAUT, inspectors have the option to apply various scanning techniques for performing weld inspections according to their configurations. These include the sectorial scan (S-scan) or a fixed-angle electronic scan (E-scan), or a combination of both called a compound S-scan. Compound S-scan, introduced around 2015 (Magruder 2016), has not been much explored, as not enough data can be extracted from the available resources to determine its effectiveness for inspection. Therefore, the author has taken a specific interest in studying this technique by comparing the available PAUT scanning techniques and providing options for selecting the most appropriate scanning techniques for the intended applications. For this purpose, a 25 mm thick welder qualification test plate with natural defects (verified by RT) was studied.



Magruder, C., 2016, “Advances in Phased Array Weld Inspection Scan Plan Designs – Use of Compound S-scan for Improved Weld Flaw Detection and Sizing,” ASNT Annual Conference, 24–27 October, Long Beach, CA

Moles, M., R. Kruzic, and E. Ginzel, 2010, “Bevel Incidence Angle Requirements for Encoded Phased Arrays,” Materials Evaluation, Vol. 68, No. 1, pp. 28–36

Olympus, 2007, Advances in Phased Array Ultrasonic Technology Applications (ebook), Olympus Corp., Waltham, MA

ASME, 2019a, ASME Boiler and Pressure Vessel Code, Section V: Nondestructive Examination

ASME, 2019b, ASME Boiler and Pressure Vessel Code, Section VIII: Rules for Construction of Pressure Vessels, Division 2: Alternative Rules

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