What type of flaws can be detected by ultrasonic techniques that utilize an angle beam?

Ultrasonic techniques that utilize an angle beam are particularly effective for detecting through-thickness cracks in base metals. This method employs sound waves that are introduced at an angle, allowing for the identification of variations in the material's integrity beyond just the surface.

When angle beam ultrasonic testing is performed, the direction of the sound wave can be manipulated to enhance the detection of flaws that are not just limited to the surface but may extend deeper into the material. This capability is crucial for locating internal defects like cracks, inclusions, and other structural anomalies that may compromise the integrity of the component being tested.

While surface flaws and corrosion-related defects can be addressed through various ultrasonic testing techniques, the specific design of angle beam testing makes it particularly suited for detecting flaws that penetrate through the thickness of the material, such as laminar cracks in welds or base metals. Thus, it targets internal flaws effectively, validating that the identified answer is indeed correct.