T.O. 33B-1-15-41Table 5-4. Couplant Materials for Contact Inspection.Approximate Surface Roughness(microinches, m in) Couplant Material4-100 SAE 10W motor oil50-200 SAE 20-20W motor oil100-400 SAE 30W motor oil250-700 SAE 40W motor oil700-over Cup greaseSECTION IIIULTRASONIC TECHNIQUES5.3 ULTRASONICTECHNIQUES.5.3.1 GuidelinesforInspectorFamiliarization.Familiarization with the methods and equipment can be obtained by:a. Performing the familiarization tests included in the instrument manuals.b. Performing the calibration procedures given in Section 5.2.c. Making distance amplitude correction curves and establishing transfer on some specimens as describedin paragraph 5.3.5.3.1..d. For surface wave familiarization, perform the tests given in paragraph 5.3.3.3.3.All these familiarization tests and procedures should be followed in detail by the new operator. It is recommended thatthe procedures be run through several times. The operator should experiment with various combinations of specimensand search units to become familiar with different ultrasonic inspection procedures and equipment.5.3.2 ContactandImmersion.Ultrasonic inspections can be separated into two basic categories: contact inspection and immersion inspection(paragraph 5.1.3). Immersion inspections are no longer confined to a tank of water in a laboratory or factory.Bubblers, squirters, or water columns enables the use of immersion techniques with portable ultrasonic scanningequipment in field inspections.5.3.3 CommonInspectionMethods.5.3.3.1 StraightBeamMethod.5.3.3.1.1 General.This method uses longitudinal waves (paragraph 5.1.4.1).
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