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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
... 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 Mechanics , Warsaw...
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
... 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 of the sample ( Fig. 8 ). The conducting coil carries a high-frequency alternating current...
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
... in the form of flight by-flight records of the counts from the vertical accelerometer sensors fitted to the airframe 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...
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
..., 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 ultrasonic testing (UT) for metals, and radiographic testing (RT) are available in these instances. Eddy current...
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
...Pressure test results Table 1 Pressure test results Tube location (a) Deepest eddy current testing defect, % wall Eddy current voltage Test results C2-R20-T36 42 13.96 Pass at 520 kPa (75 psi) C1-R120-T43 66 11.31 Pass at 520 kPa (75psi) C1-R120-T23 71 8.83 Pass...
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
... to understand how safe and reliable that equipment or structure might be over this additional time of service. Common Measurement Techniques Many measurement techniques are employed in NDE. Those most widely used are visual, liquid penetrant, magnetic particle, eddy current, ultrasonic, and radiographic...
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
... be used to reveal imperfections of this type. Fortunately, relatively few imperfections produced during manufacture escape detection and lead to failures in service. The combination of eddy-current and hydrostatic testing, whether conducted by the fabricator or tube supplier, effectively minimizes...
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
... on a given component with standard nondestructive evaluation techniques (i.e., visual inspection, eddy current, fluorescent dye penetrant, ultrasonic, etc.). In more complicated structures, the failure analyst must identify the components and locations most vulnerable to cracking. Empirical Observation...
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
... components eddy current, ultrasonic, x-ray, dye-penetrant, and visual inspections are regularly accomplished. Fatigue Crack Growth Variables The fundamental variables involved in any life assessment are those that describe the effects and interaction of material behavior, geometry, and stress history...
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
...-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 polarization curves. The assumption that corrosion rates remain constant...
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
..., and oxygen content influence the magnitude of galvanic currents between minerals and grinding media. Galvanic currents exist between ferritic and martensitic phases in a microstructure of steel grinding media as well as between sulfide minerals and these two phases ( Ref 31 ). Role of Localized Corrosion...
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
... 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 revealed several possible flaw indications in the weld regions, but none could...
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
... to reveal imperfections of this type. Fortunately, relatively few imperfections produced during manufacture escape detection and lead to failures in service. The combination of eddy-current and hydrostatic testing, whether conducted by the manufacturer or tube supplier, effectively minimizes service...
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.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
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
.... The most widely used inspection methods in the welding industry are visual, liquid penetrant, magnetic particle, radiographic, ultrasonic, acoustic emission, eddy current, and the electric current perturbation technique. Each of these methods and techniques (within each method) has its own specific...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... inspection (MPI), ultrasound testing, eddy current and computed tomography (CT). Neither FPI nor MPI are recommended if scale or surface deposits are present, because the testing fluids used in the procedure would alter the original composition of the deposits. Both FPI and MPI can be performed, if required...
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
..., eddy-current testing, dye penetrant inspection, and other methods. Cracks, porosity, and unsoundness of various types may be able to be detected without cutting the part. Microfractrography and other techniques with scanning electron microscope, including localized chemical analysis...