Which non-destructive testing method uses high-frequency sound waves to detect internal weld flaws?

Which non-destructive testing method uses high-frequency sound waves to detect internal weld flaws?

• A. Radiographic Testing (RT)
• B. Magnetic Particle Testing (MT)
• C. Visual Testing (VT)
• D. Ultrasonic Testing (UT)

Answer: (D)

Ultrasonic Testing uses high-frequency sound waves to detect internal weld flaws. A probe sends a rapid ultrasonic pulse into the metal; when the wave encounters a boundary, such as a flaw or the far surface, part of it reflects back to the probe. The travel time and echo strength reveal the flaw’s location, size, and the remaining wall thickness. This method requires good coupling between the probe and the material and access to a surface to place the transducer. It can be used in different modes, like pulse-echo or phased-array, to inspect internal features that aren’t visible on the surface. Radiographic Testing, Magnetic Particle Testing, and Visual Testing rely on different principles and do not use high-frequency sound waves.

Ultrasonic Testing uses high-frequency sound waves to detect internal weld flaws. A probe sends a rapid ultrasonic pulse into the metal; when the wave encounters a boundary, such as a flaw or the far surface, part of it reflects back to the probe. The travel time and echo strength reveal the flaw’s location, size, and the remaining wall thickness. This method requires good coupling between the probe and the material and access to a surface to place the transducer. It can be used in different modes, like pulse-echo or phased-array, to inspect internal features that aren’t visible on the surface. Radiographic Testing, Magnetic Particle Testing, and Visual Testing rely on different principles and do not use high-frequency sound waves.