How would you identify a flaw from a multi-echo response?

How would you identify a flaw from a multi-echo response?

• A. Look for a single, strongest echo and mark it as the flaw
• B. Look for a primary defect echo with consistent geometry and corroborate using different angles, times, or calibrations
• C. Ignore echoes that repeat from the surface
• D. Measure only surface echoes and disregard subsurface signals

Answer: (B)

When identifying a flaw in ultrasonic testing, the key idea is to look for a primary defect reflection that has a believable, consistent geometry and then verify it by checking how it appears under different conditions. A real flaw will produce a strong, well-defined echo from the defect boundary, and that echo should stay at the same depth and have the same overall shape as you change the probe angle, adjust the timing, or tweak calibration settings. By obtaining multiple measurements—different angles, different times-of-flight, and different calibration states—you confirm that the same reflector is producing the signal. This cross-check helps distinguish a true flaw from surface artifacts, noise, or reverberations, which tend to behave differently when you vary these parameters. If the echo remains consistent across these variations, it’s strong evidence of a flaw. If it changes or disappears with angle or calibration, it’s more likely an artifact.

When identifying a flaw in ultrasonic testing, the key idea is to look for a primary defect reflection that has a believable, consistent geometry and then verify it by checking how it appears under different conditions. A real flaw will produce a strong, well-defined echo from the defect boundary, and that echo should stay at the same depth and have the same overall shape as you change the probe angle, adjust the timing, or tweak calibration settings. By obtaining multiple measurements—different angles, different times-of-flight, and different calibration states—you confirm that the same reflector is producing the signal. This cross-check helps distinguish a true flaw from surface artifacts, noise, or reverberations, which tend to behave differently when you vary these parameters. If the echo remains consistent across these variations, it’s strong evidence of a flaw. If it changes or disappears with angle or calibration, it’s more likely an artifact.