Which scanning methods could be classified as immersion type test?

Which scanning methods could be classified as immersion type test?

• A. Tank in which the search unit and test piece are immersed
• B. Squirter bubbler method in which the sound is transmitted in a column of flowing water
• C. Scanning with a wheel type search unit with the transducer inside a liquid filled tire
• D. All of the above

Answer: (D)

In ultrasonic testing, immersion type tests use a liquid as the coupling medium between the transducer and the test piece, allowing the ultrasound to travel through the water path and enabling flexible scanning geometries. A tank where both the search unit and the test piece are submerged fits this clearly, since the transducer is in water and energy travels through the liquid to the piece. The squirter bubbler method also uses a column of flowing water to couple the transducer to the test surface, so the transducer is effectively immersed in the liquid medium here as well. The wheel-type search unit with the transducer inside a liquid-filled tire places the transducer in liquid while scanning, providing the same water coupling advantage. Because each described method relies on a liquid between the transducer and the test piece, they all qualify as immersion-type testing.

In ultrasonic testing, immersion type tests use a liquid as the coupling medium between the transducer and the test piece, allowing the ultrasound to travel through the water path and enabling flexible scanning geometries.

A tank where both the search unit and the test piece are submerged fits this clearly, since the transducer is in water and energy travels through the liquid to the piece. The squirter bubbler method also uses a column of flowing water to couple the transducer to the test surface, so the transducer is effectively immersed in the liquid medium here as well. The wheel-type search unit with the transducer inside a liquid-filled tire places the transducer in liquid while scanning, providing the same water coupling advantage.

Because each described method relies on a liquid between the transducer and the test piece, they all qualify as immersion-type testing.