T9074-AS-GIB-010/271 Rev 1
APPENDIX B REQUIREMENTS FOR ULTRASONIC CHARACTERIZATION AND SIZING INSPECTION OF EMBEDDED AND SURFACE CONNECTED DISCONTINUITIES ......................................................... B-1 B.1 SCOPE. ..................................................................................................................................................................... B-1 B.1.1 Certification. ................................................................................................................................................... B-1 B.1.2 Procedure. ....................................................................................................................................................... B-1 B.2 DEFINITIONS. ........................................................................................................................................................ B-1 B.2.1 Absolute Arrival Time Technique (AATT). ................................................................................................... B-1 B.2.2 Collateral Echo 1 (CE-1). ............................................................................................................................... B-1 B.2.3 Collateral Echo 2 (CE-2). ............................................................................................................................... B-1 B.2.4 Creeping Wave. .............................................................................................................................................. B-1 B.2.5 Echo Dynamics. .............................................................................................................................................. B-1 B.2.6 High-Angle Longitudinal Wave (HAL)Technique. ........................................................................................ B-1 B.2.7 Planar Discontinuity. ...................................................................................................................................... B-2 B.2.8 Specular Reflection......................................................................................................................................... B-2 B.2.9 Tip Signal. ...................................................................................................................................................... B-2 B.2.10 Volumetric Discontinuity.............................................................................................................................. B-2 B.3 EQUIPMENT. .......................................................................................................................................................... B-2 B.3.1 Ultrasonic Instrument...................................................................................................................................... B-2 B.3.2 Transducers..................................................................................................................................................... B-2 B.3.3 Calibration Blocks and Reference Standards. ................................................................................................. B-2 B.3.4 Couplant.......................................................................................................................................................... B-2 B.4 CALIBRATIONS. .................................................................................................................................................... B-2 B.4.1 Calibration. ..................................................................................................................................................... B-2 B.4.1.1 Curved Surfaces. ....................................................................................................................................... B-2 B.4.2 Calibration Interval. ........................................................................................................................................ B-2 B.5 PREREQUISITES. ................................................................................................................................................... B-3 B.5.1 Inspection Area. .............................................................................................................................................. B-3 B.5.2 Recommended Practice................................................................................................................................... B-3 B.5.3 Surface Preparation......................................................................................................................................... B-3 B.5.4 Scanning. ........................................................................................................................................................ B-3 B.5.5 Scanning Considerations................................................................................................................................. B-3 B.6 DISCONTINUITY CHARACTERIZATION. ......................................................................................................... B-3 B.6.1 Characterization. ............................................................................................................................................. B-3 B.6.2 Straight Beam Evaluation. .............................................................................................................................. B-3 B.6.3 Shear Wave Evaluation................................................................................................................................... B-3 B.6.4 Echo Dynamics. .............................................................................................................................................. B-3 B.6.5 Transducer Skew. ........................................................................................................................................... B-4 B.6.6 Orbit the Discontinuity. .................................................................................................................................. B-4 B.6.7 30-70-70 Creeping Wave Technique. .......................................................................................................... B-4 B.7 SIZING DISCONTINUITIES. ................................................................................................................................. B-4 B.7.1 Sizing Volumetric Discontinuities/Rapid Drop Method. ................................................................................ B-4 B.7.2 Sizing Planar Discontinuities. ......................................................................................................................... B-4 B.7.2.1 Straight Beam Longitudinal Wave Technique. ......................................................................................... B-4 B.7.2.2 Absolute Arrival Time Technique (AATT). ............................................................................................. B-4 B.7.2.3 High-Angle Techniques. ........................................................................................................................... B-4 B.7.3 Evaluation. ...................................................................................................................................................... B-5 B.8 RECORDS. ............................................................................................................................................................... B-5 B.8.1 Reporting Requirements. ................................................................................................................................ B-5
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