Non-Destructive Testing (NDT) Practice Test

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What instrument adjustment must be changed to ensure accurate results when performing inspections on aluminum?

Frequency
Amplitude
Velocity
Gain

The correct answer is: Velocity

When performing inspections on aluminum, it's essential to adjust the velocity measurement to ensure accurate results. This is because different materials have varying acoustic properties, affecting sound wave propagation speeds. Aluminum has a specific velocity associated with sound waves traveling through it, which is crucial when interpreting inspection data. If the velocity is not properly set for aluminum, the time it takes for sound waves to return to the sensor can be miscalculated. This miscalculation can lead to incorrect depth measurements or identification of flaws, ultimately compromising the integrity and safety assessments of the aluminum structure being inspected. Ensuring that the velocity setting reflects aluminum's characteristics allows for precise readings and reliable evaluations during the inspection process.