Ultrasonics has become widespread as a nondestructive testing technique. The most commonly used device for generation and reception of ultrasound are contacting piezo-electric transducers. Because these devices require physical coupling with the sample, test specimens must be stationary, and surfaces both cool and nonabrasive. Obviously, traditional contacting transducers cannot be used for real-time evaluation of certain manufacturing operations, such as weld quality control, where the test specimen could be in motion, and hot as well. This paper presents an evaluation of a noncontacting ultrasonic testing system consisting of a laser and fiber optic probe for generating ultrasound and an electromagnetic acoustic transducer for receiving the signals. This system has been applied to simulated liquid welds to demonstrate the feasibility of using similar equipment for real-time weld quality control. Weld penetration depth is investigated. [S1087-1357(00)70701-5]
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February 2000
Technical Papers
Laser Array/EMAT Ultrasonic Measurement of the Penetration Depth in a Liquid Weld Pool
G. M. Graham,
G. M. Graham
Milliken Research Corporation, 920 Milliken Road, M-405, Spartanburg, South Carolina 29303
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S. N. Hopko
S. N. Hopko
Georgia Institute of Technology, Woodruff School of Mechanical Engineering, Atlanta, Georgia 30332-0405
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G. M. Graham
Milliken Research Corporation, 920 Milliken Road, M-405, Spartanburg, South Carolina 29303
S. N. Hopko
Georgia Institute of Technology, Woodruff School of Mechanical Engineering, Atlanta, Georgia 30332-0405
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received November 1997 revised March 1998. Associate Technical Editor: R. Kovacevic.
J. Manuf. Sci. Eng. Feb 2000, 122(1): 70-75 (6 pages)
Published Online: March 1, 1998
Article history
Received:
November 1, 1997
Revised:
March 1, 1998
Citation
Graham , G. M., Ume , I. C., and Hopko , S. N. (March 1, 1998). "Laser Array/EMAT Ultrasonic Measurement of the Penetration Depth in a Liquid Weld Pool ." ASME. J. Manuf. Sci. Eng. February 2000; 122(1): 70–75. https://doi.org/10.1115/1.538910
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