Which non-destructive testing method involves the use of sound waves to identify flaws in materials?

Ultrasonic Testing is a non-destructive testing method that utilizes high-frequency sound waves to detect flaws or imperfections in materials. The principle behind this testing method is based on the transmission of sound waves into the material being tested. When these sound waves encounter a flaw, such as a crack or void, they are reflected back to the source. By analyzing the reflected sound waves, operators can determine the presence, location, and size of the flaw.

This technique is particularly valuable because it allows for in-depth analysis without damaging the material being tested. Ultrasonic Testing is widely used in various industries, including manufacturing, aerospace, and construction, to ensure the integrity and reliability of components.

The other options represent different methods of non-destructive testing; for instance, Liquid Penetrant Testing is used to reveal surface defects through the application of a colored dye. Eddy Current Testing involves electromagnetic induction and is typically used to detect surface and near-surface defects in conductive materials. Visual Inspection is the simplest form of non-destructive testing, which relies on the human eye to assess the condition of materials but lacks the precision and depth of analysis provided by ultrasonic techniques.