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eddy-current conductivity measurement

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Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006289
EISBN: 978-1-62708-169-6
... in the quality assurance of heat treated aluminum products is effectively used in conjunction with the measurement of surface electrical conductivity. This article provides a detailed discussion of the error sources in eddy-current conductivity measurements. It also presents useful information on the variation...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005341
EISBN: 978-1-62708-187-0
... Inspection and Automated Defect Recognition Ultrasonic Inspection Eddy Current Inspection Process-Controlled Resonant Testing (Contributed by Quasar International, Inc.) Leak Test Electrical Conductivity Measurement This article summarizes the application of these nondestructive tests...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003234
EISBN: 978-1-62708-199-3
... of electromagnetic induction and is used to identify or differentiate a wide variety of physical, structural, and metallurgical conditions in electrically conductive ferromagnetic and nonferromagnetic metals and metal parts. Eddy-current inspection is used: To measure and identify conditions and properties...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003234
EISBN: 978-1-62708-199-3
... on the principles of electromagnetic induction and is used to identify or differentiate a wide variety of physical, structural, and metallurgical conditions in electrically conductive ferromagnetic and nonferromagnetic metals and metal parts. Eddy-current inspection is used: To measure and identify conditions...
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
... 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 parts. Eddy-current inspection can be used to: Measure or identify such conditions and properties...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006336
EISBN: 978-1-62708-179-5
... of the material conductivity. So, in essence, eddy-current inspection is a very precise measurement of conductivity. Signal analysis using a complex impedance plot can provide significant information on materials processing, composition, microstructure, hardness, temperature, and cracks or porosity or material...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005616
EISBN: 978-1-62708-174-0
.... Model-based algorithms can be developed to use eddy current signal amplitude and phase information to plot the array data in terms of the material electrical conductivity. The conductivity data collected with an array technique have been used to correlate the eddy current measurement results with an LOP...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006477
EISBN: 978-1-62708-190-0
... to plot the array data in terms of the material electrical conductivity. The conductivity data collected with an array technique have been used to correlate the eddy-current measurement results with an LOP defect in a friction stir weld ( Ref 14 ). Other eddy-current techniques, such as pulsed eddy...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005857
EISBN: 978-1-62708-167-2
... magnetic field, but it provides a more sensitive and even more certain means of detection. Ultrasonic and eddy-current testing, quantitative magnetic flux leakage techniques, and the alternating current (ac) potential drop and field methods can be used to measure the depths of cracks and other defects...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0009152
EISBN: 978-1-62708-186-3
... commonly used sensor for measuring displacement. Linear Variable Differential Transformers Proximity Sensors Photoelectric Sensors Ultrasonic Sensors Acoustic Emission Sensors Ultrasonic Sensors Eddy Current Sensors By measuring certain material flow parameters...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006445
EISBN: 978-1-62708-190-0
...-rays/camera Image analysis of 3-D volumetric model/image comparison Volume Mostly not possible If inclusion changes total absorption >0.5% More detailed than x-ray. Flaw must cause measurable difference in absorption (>0.5%); no cracks, only volumetric flaws Eddy current local Eddy...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001473
EISBN: 978-1-62708-173-3
... of parallel with the radiation beam. In an eddy-current or ultrasonic test, the length of probe movement between the indication end points is what is being measured. The definition of the end points can be a problem. The most common method employed in ultrasonic tests is the 6 dB drop sizing method...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006449
EISBN: 978-1-62708-190-0
... Institute (API). The API Specification 5CT ( Ref 3 ) for casing and tubing allows NDE device measurement of wall thickness (Section 10.13.4) and requires NDE inspection to be full body, full length for most pipe grades (with options for ultrasonic, flux-leakage, eddy-current, and magnetic-particle testing...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002363
EISBN: 978-1-62708-193-1
... Ultrasonic Methods Eddy Current Techniques Infrared Techniques Exoelectrons Gamma Radiography Microscopy Methods X-Ray Diffraction In-Field Application Optical Methods Compliance Method Electric Potential Measurement Gel Electrode Imaging Methods Magnetic Barkhausen Effect...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... speed Automation available Permanent record provided Specimen contact not necessary Information on many parameters provided simultaneously The method is based on the indirect measurement of eddy currents when a coil conducting an alternating current is placed around or near the surface...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006443
EISBN: 978-1-62708-190-0
... by both direct measurements and comparisons to equipment known to be operating properly. The frequency and amplitude of the eddy current generating output can be directly measured. The adequacy of the scanning devices is most easily checked by scanning production parts with flaws located in critical areas...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001109
EISBN: 978-1-62708-162-7
... fields can be broken into three components (see Fig. 18 and Ref 23 ): Hysteresis Penetration Eddy currents Fig. 18 Measurements of the ac loss in a twisted multifilamentary composite in a dc magnetic field with a small ac ripple. As L decreases, the magnitude of the ac losses...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006467
EISBN: 978-1-62708-190-0
... of eddy-current signal output versus flaw depth to measure detectability of flaws—specifically cracks (open circles) and scabs (closed circles)—in cold-drawn wires. Source: Ref 1 Fig. 15 Schematic of a high-tension sheared bolt Fig. 18 Plot of eddy-current signal output versus flaw...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005898
EISBN: 978-1-62708-167-2
... ) + q vol Considering Joule heat as a heat source gives: (Eq 15) q vol = q Joule = J 2 / σ where J is conductive or inductive electrical current density and σ is electrical conductivity. For a quasi-stationary field with an alternating inductive current...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005863
EISBN: 978-1-62708-167-2
... associated with these measurements. The article also discusses the commonly used non-destructive testing methods, namely, magnetic particle testing, ultrasonic testing, and eddy current testing to evaluate induction-hardened components. References References 1. Rudnev V. , Loveless D...