Non-Destructive Testing (NDT) Practice Test

What is the technique of placing the transducer at an angle less than 90 degrees to the surface known as?

1. Direct beam testing

2. Angle beam testing

3. Surface wave testing

4. Longitudinal beam testing

The correct answer is: Angle beam testing

The technique of placing the transducer at an angle less than 90 degrees to the surface is known as angle beam testing. This method is commonly used in ultrasonic testing to improve the detection of flaws that may be oriented in various directions relative to the surface of the material being examined. When the transducer is positioned at an angle, it allows for the generation of shear waves, which can propagate through the material in a manner sensitive to specific types of discontinuities such as cracks or inclusions. By utilizing angle beam testing, inspectors can achieve better coverage of the material and enhance the sensitivity of the inspection. This technique is particularly useful when inspecting welds or other areas where defects might lie just below the surface. The ability to detect flaws at specific angles adds to the versatility of ultrasonic testing, making it a fundamental practice in the field of non-destructive testing.