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eddy current

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003234
EISBN: 978-1-62708-199-3
...Abstract Abstract Eddy-current inspection is a nondestructive evaluation method based on the principles of electromagnetic induction. Eddy-current methods are used to identify or differentiate a wide variety of physical, structural, and metallurgical conditions in electrically conductive...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006450
EISBN: 978-1-62708-190-0
...Abstract Abstract Eddy-current inspection is based on the principles of electromagnetic induction and is used to identify or differentiate among a wide variety of physical, structural, and metallurgical conditions in electrically conductive ferromagnetic and nonferromagnetic metals and metal...
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Published: 01 August 2018
Fig. 25 Schematics of eddy-current flow. (a) Eddy-current flow around a probe coil for a sound billet. (b) Eddy currents flowing around the seam in a defective billet, thus altering the electrical loading on the probe coil More
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Published: 31 October 2011
Fig. 12 Example of array eddy current examination for a friction stir weld in an aluminum plate. (a) Photo showing friction stir weld in an aluminum specimen with locations of flaws. (b) Test results at 20 kHz. (c) Test results at 480 kHz More
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Published: 01 January 2006
Fig. 21 Principle of eddy current material testing. Source: Ref 2 , 26 More
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Published: 01 August 2018
Fig. 37 Example of automated ultrasonic and eddy-current phased array system for bar inspection. Used with permission of Olympus More
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Published: 01 August 2018
Fig. 1 Two common types of inspection coils and the patterns of eddy current flow generated by the exciting current in the coils. Solenoid-type coil is applied to cylindrical or tubular parts; pancake-type coil, to a flat surface. More
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Published: 01 August 2018
Fig. 2 Effect of a crack on the pattern of eddy current flow in a pipe More
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Published: 01 August 2018
Fig. 3 Principal elements of a typical system for eddy-current inspection of bar or tubing. See description in text. More
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Published: 01 August 2018
Fig. 5 Simplified equivalent circuit (a) of an eddy-current inspection coil and the part being inspected. (b) to (d) Three impedance diagrams for three conditions of the equivalent circuit. See text for explanation. More
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Published: 01 August 2018
Fig. 10 Variation in density of eddy current as a function of depth below the surface of a conductor—a variation commonly known as skin effect More
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Published: 01 August 2018
Fig. 23 Types and applications of coils used in eddy-current inspection. (a) Probe-type coil applied to a flat plate for detection of a crack. (b) Horseshoe-shaped or U-shaped coil applied to a flat plate for detection of a laminar flaw. (c) Encircling coil applied to a tube. (d) Internal More
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Published: 01 August 2018
Fig. 24 Arrangements of multiple coils used in eddy-current inspection, (a) absolute, (b) differential. See text for discussion. More
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Published: 01 August 2018
Fig. 25 Eddy-current array probe. More
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Published: 01 August 2018
Fig. 27 Four types of eddy current instruments. (a) A simple arrangement, in which voltage across the coil is monitored. (b) Typical impedance bridge. (c) Impedance bridge with dual coils. (d) impedance bridge with dual coils and a reference sample in the second coil More
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Published: 01 August 2018
Fig. 32 Eddy current signals obtained with an internal rotating probe operating at 250 kHz for the discontinuities shown. (a) 2 mm (0.08 in.) diam radial hole. (b) OD surface narrow slit. (c) OD surface longitudinal groove. Source: Ref 9 More
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Published: 01 August 2018
Fig. 33 Setup and encircling coil components for continuous eddy-current inspection of ferromagnetic or nonferromagnetic tubes up to about 75 mm (3 in.) in diameter More
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Published: 01 August 2018
Fig. 34 Absolute bobbin probe with flexible wafer guides used for the eddy current evaluation of heat exchanger tubesheet rolled joints More
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Published: 01 August 2018
Fig. 40 Eight possible coil combinations employed in the eddy current reflection and transmission methods of inspecting nonmagnetic tubes. See text for description. More
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Published: 01 August 2018
Fig. 41 Setup and coil arrangement for the eddy-current inspection of longitudinal welds in ferromagnetic welded tubing More