S9074-AR-GIB-010/278
For deposits greater than 1/2 inch and less than 1 inch, the (T/2 + 1/4 inch) TMD hole my be omitted. All holes in the test block shall be separated sufficiently to preclude acoustic or mechanical interference with calibration.
(b)
In the case of deposited metal 1/2 inch or less in thickness, the test equipment shall be adjusted to provide an indication 85 to 90 percent of full screen height fm the hole at T/2 TMD. At this equipment setting, the signal amplitudes received from the other two holes shall be marked on the screen and all three signal shall be connected by means of straight lines to provide a DAC curve. If the T/2 TMD hole is omitted, the test equipment shall be adjusted to provide an indication 85 to 90 percent of full screen height from the hole which reflects the greatest signal amplitude . The peaks of the signals received from the two holes will be connected by a straight line to form the DAC. In the case of deposited metal thicker than 1/2 inch. the test equipment shall be adjusted to provide an indication 85 to 90 percent full screen height from the hole which reflects the greatest signal amplitude. At this equipment setting, the indications from the remaining holes (or hole) shall be marked on the screen and a DAC curve lade. When inspecting production hardware, the first 1/2 inch of weld deposited metal shall be evaluated using the DAC curve specified in (a)(l) and the remaining thickness shall be evaluated using the DAC curve specified in (a)(2). The horizontal sweep shall be adjusted so that the position of the indication from the calibration hole at TMD + 1/16 inch is at least 25 percent of full screen width.
10.4.4.2 Acceptance criteria for weld defects and lack of bond in weld deposited buttering:
(a)
Indications greater than the DAC curve specified in 10.4.4.1.1 are unacceptable .
(b)
Indications greater than 50 percent of the DAC curve and longer than that permitted by figure 2 are unacceptable. Separate indications greater than 50 percent of the DAC curve shall be separated by a minimum distance of 2 inches in any direction. Indications greater than 50 percent of the DAC curve shall be recorded on the UT report as to aqlitude, extent. and location.
(b)
(d)
Original 99
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