Discussion
Ultrasonic testing is done in materials to determine
Answer: A
Ultrasonic testing is used to find cracks below the surface.
A probe sends high-frequency sound waves into the material. A crack, void or inclusion inside reflects part of the wave back, and the echo's timing shows how deep the flaw lies. It is a non-destructive test, widely used on welds, castings, forgings and rails.
Yield strength and ultimate tensile strength are measured destructively, by pulling a specimen in a tensile test. Hardness is measured by indentation tests such as Brinell, Rockwell or Vickers.
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