MIL-STD-962D
MIL-DTL-12345
APPENDIX A
PROCEDURE FOR ULTRASONIC INSPECTION OF COMPOSITION 13 BAR STOCK A.1 SCOPE
A.1.1 Scope. The appendix details the procedure for ultrasonic inspection of composition 13 bar stock selected for the manufacture of bearing balls. This appendix is a mandatory part of this standard. The information contained herein is intended for compliance.
A.2 PROCEDURE
A.2.1 Calibration standard. Reference pieces for calibration shall be of the same material, metal travel distance, surface finish, and ultrasonic response as the bar stock being tested.
A.2.1.1 Reference test piece for bar stock 5/8-inch to 1-1/2-inch diameter. The reference test piece shall be a bar of at least 3 feet in length. For near zone testing, metal travel shall be 4/10 the diameter and 9/10 the diameter of the test piece to flat bottom holes (FBHs) 0.02 inches in diameter. For far zone testing, metal travel shall be 6/10 the diameter and 1/10 the diameter of the test piece to FBHs 0.02 inches in diameter.
A.2.1.2 Reference test piece for bar stock 1/2-inch to 5/8-inch diameter. The reference test piece shall be a bar of at least 3 feet in length. For near zone testing, metal travel shall be 4/10 the diameter and 9/10 the diameter of the test piece to FBHs 0.02 inches in diameter of 0.062-inch depth. For far zone testing, metal travel shall be 6/10 the diameter and 1/10 the diameter of the test piece with metal travel 0.06 inch to a FBH of
0.02 inch diameter.
A.2.1.3 Reference test piece for bar stock less than 1/2-inch diameter. For bar stock less than 0.5-inch diameter, only one FBH providing 1/2 diameter travel shall be required.
(THIS IS AN EXAMPLE ONLY. THE REQUIREMENT IS IN 5.14.)
FIGURE 6. Example of appendix.
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