One of the most common applications of ultrasonic tests employing shear waves is:

• A. Detection of discontinuities in welds, tube, and pipe
• B. Determination of elastic properties of metallic products
• C. Detection of laminar discontinuities in heavy plate
• D. Measurement of thickness of thin plate

Answer: (A)

Shear waves in ultrasonic testing are transverse waves that travel through solids and are especially effective for spotting flaws that lie in the welds and tubular regions. When you use shear-wave testing, flaws such as lack of fusion, cracks, or other discontinuities in welded joints or in tubes and pipes produce strong reflections that are easy to interpret, making this approach a go-to method for inspecting these geometries.

That’s why detecting discontinuities in welds, tubes, and pipes is the most common application. Welded joints and tubular components have many potential planar flaws, and the shear-wave angle-beam setup is well suited to interrogate the weld region and reveal these defects with clear echoes.

Other options lean toward different objectives or require different wave modes. Measuring elastic properties or shear modulus is a more specialized use and not the everyday goal of routine UT. Detecting laminar discontinuities in heavy plate is possible but less central to typical UT practice with shear waves, and measuring thickness of thin plate is usually done with other wave modes or configurations focused on through-thickness measurements.