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eddy-current conductivity measurement

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001811
EISBN: 978-1-62708-241-9
... stress analysis by eddy current method . J. Am. Sci. 4 ( 4 ), 1 – 6 ( 2008 ) 4. Barac D. , Katcher W. , Soules J. : Advances in eddy current measurement of residual stress . In: 7th International Conference on Shot Peening , pp. 326 – 335 . The Institute of Precision...
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: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... of the component. Near-surface and subsurface techniques are available to the failure analyst in these cases, to investigate more detailed information into the volume of the component. NDE techniques such as eddy current testing (ET) for electrically-conductive materials, full volumetric inspection using...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001021
EISBN: 978-1-62708-214-3
... and a series of “overstress” events recorded during the life of the aircraft. The bolt hole was examined by eddy current testing, visual examination, high-powered light microscope, and scanning electron microscope. Simulation tests were also conducted. The use of simulation specimens permitted actual crack...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001044
EISBN: 978-1-62708-214-3
... resulted in the displacement of tube support plates, which in turn may have resulted in residual stresses in the tubes that were not damaged enough to justify replacement. The results of eddy current testing performed shortly after the shipping damage did not indicate any cracking in the tubes. In most...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003515
EISBN: 978-1-62708-180-1
... the path of the induced currents are indicated by change in coil impedance. Used on conductive materials to detect surface and near-surface discontinuities and heat treatment condition. Plating and nonmetallic coating thickness measurements are also possible. Inspection depth limited to less than one...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... orientation, usually parallel to the surface. Laminations seldom yield differences in absorption that enable laminated areas to be distinguished from lamination-free areas. Eddy-Current Inspection Eddy-current inspection can be used on all materials that conduct electricity. If a coil conducting...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... in uniform wall thinning causes considerable damage to heat-exchanger tubes. However, the principal corrosion damage in heat exchangers is usually from localized attack. Stray electrical currents may also contribute to significant corrosion of heat exchangers. Localized corrosive attack can occur as pitting...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
... size and the geometric details of the component. For instance, the smallest crack length that eddy-current inspection techniques are able to detect is approximately 0.1 mm (0.004 in.) ( Ref 20 ). If the calculated crack size at the first inspection is less than this value, it is unlikely that a crack...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003567
EISBN: 978-1-62708-180-1
... of the grinding media. In the presence of surface abrasion, the corrosion resistance, hardness of the grinding media, pH and conductivity of the pulp, and oxygen content influence the magnitude of galvanic currents between minerals and grinding media. Galvanic currents exist between ferritic and martensitic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006813
EISBN: 978-1-62708-329-4
... corrosion damage in heat exchangers is usually from localized attack. Stray electrical currents may also contribute to significant corrosion of heat exchangers. Localized corrosive attack can occur as pitting, impingement, thinning, or selective leaching. General corrosion can be the result...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001536
EISBN: 978-1-62708-229-7
... contaminants from the glass bottles used to contain the water samples. Among the anions analyzed, Cl − was detected at levels of <0.1 to 0.75 ppm and SO 2+ 4 at levels of 0.31 to 1.8 ppm. Nondestructive examinations of the three components by dye-penetrant, ultrasonic, and eddy current techniques...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... was encountered in copper alloys, caustic embrittlement was experienced in boilers. (Caustic embrittlement is also known as caustic cracking. Both of these terms are considered archaic; currently, the term caustic stress-corrosion cracking is used to describe the same phenomenon.) Cracking was observed around...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003528
EISBN: 978-1-62708-180-1
... of failure. This may be relatively straightforward or difficult, depending on the type of component and/or structure in question. Generally, the point of origin of a crack can be easily located on a given component with standard nondestructive evaluation techniques (i.e., visual inspection, eddy current...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
..., depending on the type of component and/or structure in question. Generally, the point of origin of a crack can be easily located on a given component with standard nondestructive evaluation techniques (i.e., visual inspection, eddy current, fluorescent dye penetrant, ultrasonic, etc.). In more complicated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... testing are published in Ref 2 . As the name suggests, in the controlled-current test method, the current is controlled and the resulting corrosion potential is measured. Polarization curves are generated. Galvanostatic and galvanodynamic polarization measurements are used to plot anodic and cathodic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006812
EISBN: 978-1-62708-329-4
... of a failure analysis investigation should be to not only verify damage leading to the equipment failure but also to identify the root cause of the damage and failure. Other, related goals should include: Determining whether the equipment can safely be returned to service in its current condition...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006754
EISBN: 978-1-62708-295-2
... the involved parties want to know but also by how strong their desire is to know it. In practice, the strength of the desire is measured in practical terms by the budget and timing considerations. Fig. 1 Example of a simple checklist and report for a simple part (cracking of a brace) Structured...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
.... , Vol 14 (No. 3 ), 1967 , p 108 – 116 7. Maddox S.J. , “ Fitness-for-Purpose Assessment of Misalignment in Transverse Butt Welds Subject to Fatigue Loading ,” Document XIII-1180-85, International Institute of Welding , 1985 8. Gordon J.R. , “ A Review of Currently...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... explains the SCC, which occurs due to welding, metalworking process, and stress concentration, including options for investigation and corrective measures. It describes the sources of stresses in service and the effect of composition and metal structure on the susceptibility of SCC. The article provides...