T9074-AS-GIB-010/271 Rev 1
6.6.4.5 Record of Inspection Results. In addition to the requirements of 6.5.4, records (see 1.8) for reporting inspection results of welds shall contain as a minimum the following information (for suggested forms see figure 6-12): a. Ship/item identification. b. Location (frame, side of ship, and so forth). c. Type of material. d. Thickness of material. e. Joint identification. f. Type of weld joint (weld design). g. Weld length inspected. h. Discontinuities that equal or exceed the DRL. i. If supplemental ultrasonic inspection techniques are used that contribute to the final inspection results, they shall be recorded. j. If full UT inspection coverage cannot be obtained per the approved procedure, document the location and type of missed coverage, reason and signature to denote case basis approval.
6.7 THICKNESS MEASUREMENTS.
6.7.1 Scope. Variations in wall thickness may be measured by either pulse-echo instruments or resonant frequency instruments, which have been qualified as specified in 6.5.1.2. When using numeric-style digital readouts and the reflecting surfaces are, or are believed to be, rough, pitted, or corroded, an A-scan type display shall be used to verify the digital readings. 6.7.2 Calibration. The instrument shall be calibrated on a set of standards of the same basic material (acoustically similar) as that to be inspected. No less than two standards shall be used — one shall be equal to or less than the minimum acceptable thickness and one shall be equal to or greater than the maximum acceptable thickness (if applicable). As an alternative for materials equal to or greater than 1 inch thick, multiple back reflections from ½-inch or thicker blocks may be used. If the inspection is only to determine minimum thickness violations, then one calibration standard equal to the minimum thickness is allowed. Flat standards may be used on curved surfaces, with the exception that similar curvature standards shall be used when material with a radius less than ½ inch is inspected with a dual element transducer. 6.7.3 Painted/Coated Surfaces. For thickness measurements through paint, a multiple echo technique shall be used such that the thickness measurement is taken by reading between multiple back reflections. Other methods for thickness measurements through paint may be utilized when approved by the authorized representative of NAVSEA. 6.7.4 Method. The number and location of ultrasonic thickness measurements taken shall be as specified in the applicable material specification, fabrication document, or work authorization document. Measurements may be made manually or by automated equipment that meets the requirements of 6.5.1.2.
6.8 BOND TESTING OF WELD DEPOSITED MATERIALS.
6.8.1 Scope. This subsection only describes the requirements for the ultrasonic inspection of the bond of weld deposited material to base material. Specific requirements due to special shapes or manufacturing processes shall be as specified in the appropriate specifications. 6.8.1.1 Method. Inspection of the bond of weld deposited material to base material shall be by the contact method. The transducer may be fitted with appropriate shoes, wedges, or saddles for testing on curved surfaces or at desired angles.
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