What type of ultrasonic inspection is used to find weld faults?

What type of ultrasonic inspection is used to find weld faults?

• A. Shear wave
• B. Longitudinal wave
• C. Surface wave
• D. Rayleigh wave

Answer: (A)

Ultrasonic inspection of welds relies on how different wave modes interact with flaws inside the weld region. Using shear waves is especially effective because their transverse particle motion makes them highly sensitive to planar defects such as cracks and lack of fusion that commonly occur in welds. When you send a shear wave into the weld area at the right angle, defects reflect energy back to the transducer as echoes, allowing you to detect and size the flaws based on the travel time and echo strength. Surface waves, like Rayleigh waves, stay near the surface and are better for detecting very shallow defects, not ones embedded in the weld thickness. Longitudinal waves can travel through the material but often don’t interact with weld flaws as efficiently as shear waves do for the typical flaws found in welds. So the best fit for finding weld faults is the shear-wave ultrasonics approach.

Ultrasonic inspection of welds relies on how different wave modes interact with flaws inside the weld region. Using shear waves is especially effective because their transverse particle motion makes them highly sensitive to planar defects such as cracks and lack of fusion that commonly occur in welds. When you send a shear wave into the weld area at the right angle, defects reflect energy back to the transducer as echoes, allowing you to detect and size the flaws based on the travel time and echo strength.

Surface waves, like Rayleigh waves, stay near the surface and are better for detecting very shallow defects, not ones embedded in the weld thickness. Longitudinal waves can travel through the material but often don’t interact with weld flaws as efficiently as shear waves do for the typical flaws found in welds. So the best fit for finding weld faults is the shear-wave ultrasonics approach.