The technique of examining an ultrasonic reflector from different directions helps the technician to:

• A. Distinguish between different types of flaws
• B. Distinguish between flaw indications and spurious or false indications
• C. All of the above
• D. None of the above

Answer: (A)

Viewing a reflector from different directions lets you read its geometry and orientation in the material. The way an echo changes as you change the angle of inspection depends on the shape and orientation of the flaw. A flat, planar crack will respond differently to the beam than a rounded inclusion or a lack-of-fusion region, so by observing the reflector from multiple directions you can infer what kind of flaw you’re dealing with. This directional interrogation provides a clearer signature for distinguishing flaw types, which is why this approach is the best way to identify the nature of the defect. While changing angles can also help separate true flaws from artifacts in some cases, the primary value being tested here is the ability to differentiate between different flaw geometries.