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magnetic permeability

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050009
EISBN: 978-1-62708-311-9
.... electrical resistivity induction heating magnetic permeability skin effect specific heat thermal conduction INDUCTION HEATING was first studied when it was found that heat was produced in transformer and motor windings, as mentioned in Chapter 1, “History of Metallurgy and Induction Heating,” in...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720321
EISBN: 978-1-62708-305-8
... inspection, ultrasonic inspection, and electromagnetic inspection. Eddy current and magnetic permeability are also covered. electromagnetic inspection eddy current system flaws liquid penetrant inspection magnetic particle inspection steel bar steel wire ultrasonic inspection visual inspection...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170614
EISBN: 978-1-62708-297-6
...-current loss from electric currents induced by flux changes High magnetic permeability and sometimes constant permeability at low field strengths High magnetic saturation induction Minimum or definite change in permeability with temperature in special applications Cost, availability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720183
EISBN: 978-1-62708-305-8
... 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 related to electrical conductivity, magnetic permeability, and physical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000131
EISBN: 978-1-62708-312-6
... 8.2) B = μ 0 ⁢ H where μ 0 is the proportionality constant, defined as the permeability of vacuum (or free space). When a material is placed in this magnetic field, the magnetic flux density, B , in the material becomes: (Eq 8.3) B = μ 0 ⁢ μ r ⁢ H...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720345
EISBN: 978-1-62708-305-8
..., method of fabrication, electrical conductivity, metallurgical condition, magnetic properties (notably permeability), and degree of magnetization. Both the nature of flaws and of potential but unallowable deviations from certain specified dimensions or properties have a bearing on the selection of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240303
EISBN: 978-1-62708-251-8
..., thermal properties such as thermal expansion and specific heat capacity, magnetic properties such as magnetic permeability, and optical properties such as refractivity. Some physical properties for a number of metals are given in Table 17.1 . Table 17.1 Physical properties of some metals at room...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240547
EISBN: 978-1-62708-251-8
... hardness. The addition of aluminum (2.30 to 3.15 wt%) and titanium (0.35 to 0.85 wt%) form the basis for precipitation of γ’ during aging, which increases the strength ( Fig. 29.7 ). It also has low magnetic permeability and is nonmagnetic to temperatures as low as −100 °C (−150 °F). Alloy K-500 is used...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050057
EISBN: 978-1-62708-311-9
... for magnetic materials used for flux concentrators for coils are severe. The materials must work in a very wide range of frequencies and must possess high magnetic permeability and saturation flux densities. When magnetic materials saturate, they lose their ability to concentrate magnetic flux. Stable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060315
EISBN: 978-1-62708-261-7
...-resistance alloys, superalloys, refractory metals, low-melting-point metals, reactive metals, precious metals, rare earth metals, and metalloids or semimetals. It also provides a brief summary on special-purpose materials, including uranium, vanadium, magnetic alloys, and thermocouple materials. light...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050317
EISBN: 978-1-62708-311-9
... characteristic Laminations Iron- or ferrite-base powder materials Homogeneous properties Fair (pronounced heterogeneous properties) High (still heterogeneous) Magnetic properties (magnetic permeability, magnetic saturation, etc.) High Fair (particularly in strong fields) Curie temperature High...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720001
EISBN: 978-1-62708-305-8
..., magnetic permeability, and physical dimensions (primary factors affecting eddy current response) To detect seams, laps, cracks, voids, and inclusions To sort dissimilar metals and detect differences in their composition, microstructure, and other properties, such as grain size, heat treatment, and...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720293
EISBN: 978-1-62708-305-8
... current inspection is generally restricted to depths less than 6 mm (¼ in.). The results of inspecting ferromagnetic materials can be obscured by changes in the magnetic permeability of the workpiece. Changes in temperature must be avoided to prevent erroneous results if electrical conductivity or other...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130417
EISBN: 978-1-62708-284-6
... magnetic flux, a considerably greater depth of the heated area is achieved. As for concentrator material, different applications require the use of different materials. The material for the concentrator must be chosen after considering several factors: Relative magnetic permeability Magnetic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720393
EISBN: 978-1-62708-305-8
... applications also include electrical resistivity testing, eddy current, and magnetic bridge testing, magnetic particle inspection, ultrasonic testing, x-ray radiography, gas permeability testing, and gamma-ray (γ-ray) density determination. The capabilities and limitations of these techniques are summarized in...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720365
EISBN: 978-1-62708-305-8
... are used to pass direct current or rectified alternating current through the workpiece. The magnetic particles are nontoxic, finely divided ferromagnetic material of high permeability and low retentivity, free from rust, grease, dirt, or other materials that may interfere with the proper functioning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720411
EISBN: 978-1-62708-305-8
... nondestructive inspection of weldments including visual inspection, liquid penetrant inspection, magnetic particle inspection, radiographic inspection, ultrasonic inspection, leak testing, and eddy current and electric current perturbation inspection. The chapter also describes the properties of brazing filler...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850165
EISBN: 978-1-62708-260-0
... Abstract This chapter explains how to achieve accurate, sharp delineation of the microstructure of metals using appropriate etching and contrasting techniques. It covers a variety of methods, including chemical etching, heat tinting, gas contrasting, vapor deposition, magnetic etching, ion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... by measuring impedance changes in a test coil. The instruments use wire-wound coils ( Fig. 12.5 ) placed around or in the part to be tested. Any change in the test part, such as electrical conductivity and magnetic permeability, affects the coil impedance. These changes can be measured and monitored...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170242
EISBN: 978-1-62708-297-6
... transport liquified gas. For low magnetic permeability, these alloys have a lower carbon content than the standard manganese steels. The corresponding loss in yield strength is compensated for by alloying with vanadium, nitrogen, chromium, molybdenum, and titanium. Chromium also imparts corrosion...