Acceptance Criteria of Complete Joint Penetration Steel Bridge Welds Evaluated Using Enhanced Ultrasonic Methods (2019) / Chapter Skim
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4 Background 1.1 Problem Statement and Research Objective Reliable detection of internal weld flaws using any non destructive testing (NDT) technique is essential to ensuring the desired performance of a structure.
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5 1.2 Scope of Study The research conducted for NCHRP Project 1435, "Accep tance Criteria of Complete Joint Penetration Steel Bridge Welds Evaluated Using Enhanced Ultrasonic Methods," focused on the application of PAUT to inspect steel bridge welds. Accep tance criteria, scanning procedure requirements, calibration requirements, and technician qualification requirements were developed using analytical and experimental methods.
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6 encoded scans have multiple views that can be displayed to the technician, including the following: • Ascan (x–y plot of amplitude vs. time for a single beam; top left of Figure 2)
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7 as tabulated values of indication amplitude, length, and loca tion. Operator error is introduced into the reporting process since these values often are manually transferred from physical measurements or instrument results.
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