Which method is an example of non-destructive testing?

Ultrasonic testing is a method of non-destructive testing that utilizes high-frequency sound waves to detect flaws or discontinuities in materials, without causing any damage. This technique involves sending ultrasonic waves through a material and analyzing the reflected waves, allowing technicians to assess the integrity and characteristics of the material being tested.

This method is particularly valuable because it can identify internal defects such as cracks, voids, or inclusions while preserving the material's usability. Non-destructive testing methods like ultrasonic testing are essential in various industries for quality control, inspection, and ensuring safety without compromising the integrity of the materials being evaluated.

Visual inspection, although a widely used method, is often subjective and might not detect internal defects. Destructive testing, as the name implies, assesses a material's properties by causing complete failure or damage to the sample, and microscopic examination typically requires sampling and can damage the material, thus not qualifying as non-destructive.