Ultrasonic testing is performed by imparting sound waves into a component and measuring the time it takes them to

return. Parts with reduced thickness or parts with internal defects reflect the sound beam sooner, and the resulting signal

is interpreted by the inspector. Ultrasonic inspection is useful for determining remaining thickness due to corrosion,

laminations in plates, internal defects in castings and forgings, and weld defects.


The two basic types of ultrasonic inspection are straight beam and angle beam, depending on whether the beam is sent

straight into the part or at an angle. Corrosion scanning and thickness readings are performed using straight beam.

Angle beam is usually used for weld inspection.

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