T9074-AS-GIB-010/271 Rev 1
6.6.1.1.1.2 Testing, Shear Wave. The entire outer surface shall be scanned circumferentially using the continuous scanning method. Unless otherwise specified, the test shall be performed in two opposing directions. Size and locations of indications in excess of that received from the calibration notches in accordance with table 6-2 shall be marked on the material. Table 6-2. Calibration Reference Notch Dimensions of Squar e and “U” Bottom Notch.
3±½ percent or 0.005±0.0005 inch whichever is greater 2 x depth (approximate)
Depth (percent of thickness)
Width Length
1 inch (minimum)
NOTES: 1. surface. 2.
The major plane of all square or “U” bottom notches shall be perpendicular to the entrant
The calibration standard shall be wide enough to permit sound transmission to the square or
“U” notch without side effects. 3.
The calibration standard material shall be ultrasonically sound, as well as acoustically similar and of the same nominal thickness as the material being inspected. The surface finish shall be in accordance with 6.3.2 and curvature shall be similar to the test surface. 4. The test frequency shall be the same as the calibration frequency. 5. The couplant used for calibration shall be the same as that used for inspection. 6. The use of distance amplitude correction curves is permitted for calibration.
6.6.1.1.2 Longitudinal Wave Tests of Ring Forgings.
6.6.1.1.2.1 Test Calibration, Longitudinal Wave. Sound transmission into the ring shall be confirmed by observing the first back reflection obtained from the ring. Sensitivity of the instrument shall be adjusted until the indication from the flat-bottomed hole in the standard is 80 percent of full screen height. The calibration standard shall conform to the requirements of table 6-1. 6.6.1.1.2.2 Testing, Longitudinal Wave. The ring shall be tested using the continuous method by directing the sound beam radially and axially. The axial beam direction scan shall be performed when not restricted by configuration or geometry of the material under test. The first back reflection shall be positioned on the screen to verify sound transmission and any defect indication shall appear between the initial pulse and the first back reflection.
6.6.1.2 Rectangular Forgings.
6.6.1.2.1 Test Calibration, Longitudinal Wave. Sound transmission into the forging shall be confirmed by observing the first back reflection obtained from the forging. Sensitivity of the instrument shall be adjusted until the indication from the specified calibration standard is at 80 percent of full screen height. The calibration standard shall conform to the requirements of table 6-1. 6.6.1.2.2 Testing - Longitudinal Wave. Rectangular forgings shall be tested using the continuous scanning method on surfaces such that three major planes shall be covered. Scanning with the sound beam directed axially shall be performed when not restricted by configuration or geometry of the material under test. The first back reflection shall be positioned on the screen to verify sound transmission. Suspect areas disclosed under these conditions shall be further evaluated from the side opposite to that which was originally inspected to determine maximum flaw signal amplitude.
6-6
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