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]

Issue Section:
Technical Papers
Keywords:
nondestructive testing, ultrasonic applications, piezoelectric transducers, welding, quality control, laser beam applications, optical fibres
Topics:
Flight, Lasers, Nondestructive evaluation, Rayleigh waves, Signals, Transducers, Ultrasound, Waves, Welded joints, Welding, Steel, Shear waves, Quality control, Piezoelectric transducers, Ultrasonic measurement, Temperature, Acoustics, Probes, Fibers, Manufacturing
1.
Lott, L. A., Johnson, J. A., and Smartt, H. B., 1984, “Real-time Ultrasonic Sensing of Arc Welding Processes,” Proceeding of the Symposium on Nondestructive Evaluation Application and Materials Processing, American Society for Metals, Metals Park, Ohio, pp. 13–22.
2.
Carlson
,
N. M.
, and
Johnson
,
J. A.
,
1988
, “
Ultrasonic Sensing of Weld Pool Penetration
,”
Weld. J. (Miami)
,
67
, No.
11
, pp.
239s–246s
239s–246s
.
3.
Stroud
,
R.
,
1989
, “
Problems and Observations whilst Dynamically Monitoring Molten Weld Pools using Ultrasound
,”
Br. J. Non-Destr. Test.
,
31
, No.
1
, pp.
29
–
32
.
4.
Carlson
,
N. M.
, and
Johnson
,
J. A.
,
1988
, “
Laser Sound Generation in a Weld Pool
,”
Rev. Prog. Quant. Nondestr. Eval.
,
75
, pp.
1485
–
1494
.
5.
Fenn
,
R.
,
1989
, “
Monitoring and Controlling Welding by Ultrasonic Means
,”
Br. J. Non-Destr. Test.
,
31
, No.
2
, pp.
82
–
86
.
6.
Choi
,
M. S.
, and
Yang
,
M. S.
,
1991
, “
Quality Evaluation and Control of End Cap Welds in PHWR Fuel Elements by Ultrasonic Examination
,”
J. Nucl. Mater.
,
178
, pp.
321
–
327
.
7.
Yang
,
J.
, and
Ume
,
C.
,
1994
, “
Performance Evaluation of Fiber Array for NDE Application
,”
Res. Nondestruct. Eval.
,
5
, No.
3
, pp.
175
–
190
.
8.
Yang
,
J.
,
Sanderson
,
T.
,
Graham
,
G.
, and
Ume
,
C.
,
1996
, “
Laser Phased Array Measurement of Simulated Solidified Weld Penetration Depth
,”
ASME J. Manufac. Sci. Eng.
,
118
, pp.
266
–
271
.
9.
Katz, J. M., 1982, Ultrasonic Measurements and Control of Weld Penetration, M.S. thesis, M.I.T., Cambridge, MA.
10.
Fortunko, C. M., Schramm, R. E., Moulder, J. C., and McColskey, J. D., 1984, “Electromagnetic-Acoustic-Transducer/Synthetic-Aperature System for Thick-Weld Inspection,” Nat. Bur. Stand. Tech. Note, p. 1075.
11.
Carlson
,
et al.,
1992
, “
Ultrasonic NDT Methods for Weld Sensing
,”
Mater. Eval.
,
Nov.
, pp.
1338
–
1343
.
12.
Ogilvy
,
J. A.
, and
Temple
,
J. A. G.
,
1990
, “
Theoretical Assessment of the Errors Involved in Ultrasonic Location and Sizing of Molten Weld Pools
,”
Ultrasonics
,
28
, No.
6
, pp.
375
–
381
.
13.
Stares
,
I. J.
,
Duffill
,
C.
,
Ogilvy
,
J. A.
, and
Scruby
,
C. B.
,
1990
, “
On-line Weld Pool Monitoring and Defect Detection using Ultrasonics
,”
NDT Int.
,
23
, No.
4
, pp.
195
–
200
.
14.
Achenbach, J. D., 1984, Wave Propagation in Elastic Solids, North Holland, Amsterdam.
15.
Scruby, C. B., and Drain, L. E., 1990, Laser Ultrasonics: Techniques and Applications, Adam Hilger, New York.
16.
Rayleigh, Lord, 1887, Proc. London Math. Soc., 17, No. 4.
17.
Miklowitz, J., 1978, The Theory of Elastic Waves and Waveguides, North Holland, Amsterdam.
18.
Kimura
,
M.
, et al.,
1994
, “
Analysis of Scholte Wave between Seawater and Marine Sediment
,”
Jpn. J. Phys.
,
33
, No.
5B
, Pt. 1, pp.
3278
–
3281
.
19.
Dewhurst
,
R. J.
,
Edwards
,
C.
,
McKie
,
A. D. W.
, and
Palmer
,
S. B.
,
1988
, “
A Remote Laser System for Ultrasonic Velocity Measurement at High Temperatures
,”
J. Appl. Phys.
,
63
, pp.
1225
–
1227
.
20.
Scruby
,
C. B.
, and
Moss
,
B. C.
,
1993
, “
Non-contact Ultrasonic Measurements on Steel at Elevated Temperatures
,”
Nondestr. Test. Eval Int.
,
26
, No.
4
, pp.
177
–
188
.
21.
Johnson
,
J. A.
,
Carlson
,
N. M.
, and
Lott
,
L. A.
,
1988
, “
Ultrasonic Wave Propagation in Temperature Gradients
,”
J. Nondestruct. Eval.
6
, No.
3
, pp.
147
–
157
.
22.
Yang
,
J.
,
DeRidder
,
N.
,
Ume
,
C.
, and
Jarzyniski
,
J.
,
1993
, “
Noncontact Optical Fiber Phased Array Generation of Ultrasound for Nondestructive Evaluation of Materials and Processes
,”
Ultrasonics
,
31
, No.
6
, pp.
387
–
394
.
23.
Yang, J., Sanderson, T., Graham, G., and Ume, C., 1994, “Ultrasonic Weld Penetration Depth Sensing with Laser Phased Array,” ASME International Mechanical Engineering Conference and Exposition, Chicago, IL., Nov. 14–18, PED-Vol. 68-1, pp. 245–254.
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