Guided Waves for the Detection of Defects in Welds in Plastic Pipes

Chan, C. W.; Cawley, P.

doi:10.1007/978-1-4615-1987-4_197

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…Lamb waves can be launched in the pipeline by ultrasonic exciters placed either on the outer wall or inner wall ͑for large diameter pipes͒. Several investigators [2][3][4][5][6][7][8] have used Lamb waves for inspecting corrosion, cracks, and other types of material defects in pipes. In these efforts time histories recorded by the receiver have been carefully analyzed for detecting any small signal reflected by the defect.…”

Section: Introductionmentioning

confidence: 99%

A new transducer holder mechanism for pipe inspection

Guo

Kundu

2001

The Journal of the Acoustical Society of America

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A new transducer holder mechanism has been designed and fabricated for pipe inspection by cylindrical guided waves. Commercially available ultrasonic transducers have been used to generate compressional ultrasonic waves in the coupling medium. Those waves are converted to cylindrical guided waves in the pipe by the new coupling mechanism. A number of advanced coupling mechanisms developed recently for large plate and pipe inspection require the presence of a coupling fluid between the ultrasonic transducer and the pipe or plate specimen. These mechanisms can be used for inspecting horizontal pipes and plates. The new coupling mechanism presented in this article uses solid material as the coupler and can be used equally well for inspecting horizontal as well as inclined or vertical pipes. The new coupling mechanism has been designed to generate efficiently different Lamb modes in the pipe. The new design has been used to inspect different kinds of anomalies in copper and aluminum pipes. The preliminary results show that a number of Lamb modes, when generated properly by the new coupling mechanism, are very sensitive to the pipe defects. These experimental results along with the new design of the coupling mechanism are presented in this article.

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Section: Introductionmentioning

confidence: 99%

A new transducer holder mechanism for pipe inspection

Guo

Kundu

2001

The Journal of the Acoustical Society of America

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Underwater inspection of concrete-filled steel pipes using guided waves

Kundu

Ryu

2002

KSCE J Civ Eng

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Underwater Pipeline Inspection Using Guided Waves

Kundu

2002

Journal of Pressure Vessel Technology

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Underwater pipeline inspections are conducted using ultrasonic cylindrical guided waves in the laboratory environment. Three different types of mechanical defects—gouge, removed metal, and dent—are fabricated in small-diameter, 22.22-mm, aluminum pipes and tested. To efficiently propagate the antisymmetric (flexural) cylindrical guided waves through the aluminum pipe in water, a new transducer holder device is designed. The device uses commercially available ultrasonic transducers that generate compressional ultrasonic waves in the water. The device can change the striking angle of the incident beam from 0 to 51 deg. With the help of this device, the incident angle adjustment and frequency sweeping can be carried out. This is necessary for obtaining the time history of the received signals for various incident angles and signal frequencies; then these time histories are converted to Vf curves, or received signal amplitude versus frequency curves. From the amplitude of these Vf curves, the type and extent of the mechanical defects can be estimated. This investigation shows that the new coupler device can be effectively used for health monitoring of underwater pipelines using guided waves.

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Guided Waves for the Detection of Defects in Welds in Plastic Pipes

Cited by 4 publications

References 10 publications

A new transducer holder mechanism for pipe inspection

A new transducer holder mechanism for pipe inspection

Underwater inspection of concrete-filled steel pipes using guided waves

Underwater Pipeline Inspection Using Guided Waves

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