MIL-STD-981C APPENDIX B
RADIOGRAPHIC INSPECTION
B.1. SCOPE
B.1.1 This appendix contains details for performance of the radiographic inspection for devices specified in accordance with this standard. This appendix is a mandatory part of this standard. The information contained herein is intended for compliance only.
B.2. APPLICABLE DOCUMENTS
This section is not applicable to this appendix. B.3. RADIOGRAPHIC INSPECTION
B.3.1 Radiographic inspection. Devices shall be tested in accordance with Method 209 of
MIL-STD-202. The following details and exceptions shall apply:
a. Radiographic quality - The radiograph shall render a clear sharp image of the penetrameter. b. Image quality indicator - A radiograph of the penetrameter shall be included on each
radiograph film. The penetrameter may be made from a sample of the same type as that being radiographed, with an AWG number 48 tungsten wire mounted across the body.
c. For real time x-ray, the penetrameter shall be used on the first and last image of the inspection lot.
B.3.1.1 Transformers and inductors. Examples of typical construction and terminology are shown on
Figure B-1.
B.3.1.1.1 Views - Radiographs shall be taken of each device in each of three axes; X, Y, and Z. When inadequate coverage is provided, additional views shall be taken as deemed necessary to satisfy the criteria defined herein. If three views are not feasible due to part construction, a minimum of two views shall be taken. Axial orientation is shown on Figure B-2.
B.3.1.1.2 Examination - The radiographic examination shall include, but not be limited to, inspection for extraneous materials, alignment, clearance and processing damage.
B.3.1.1.2.1 Extraneous material - There shall be no visible extraneous materials that can cause damage to insulation or electrical short circuit between conductors or connections. Loose or excessive material such as weld or solder splash, solder balls and short lengths of unattached wire shall be considered extraneous material (See Figure B-3). If the extraneous material is fully embedded in material with a measurable shore D hardness, and DWV testing has been performed to verify that the material does not cause damage or short circuit, it shall be considered acceptable.
Acceptable Conditions:
A. Extraneous material (as described above) that is located near a single wire or conductor, and cannot cause damage or short circuit, is acceptable. See Figure B3 (1 of 5) and Figure B3 (2 of 5).
B. Extraneous material (as described above) that is located near two or more conductors, and has.010" or greater between the conductors and extraneous material. See figure B3 (1 of 5).
C. Extraneous material (as described above) that is entrapped within a soft (RTV type)
material, and is .125" or greater than from any two conductors.
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