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Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005858
EISBN: 978-1-62708-167-2
... the protection system adopted for the frequency range of 50 Hz to 10 MHz. arc welding electrical field health hazards magnetic field radiation emission An electric field is created as soon as a conductor is energized, while a magnetic field appears only during a passage of an electric current...
Abstract
This article provides an overview of electromagnetic fields (EMFs) and discusses their direct and indirect effects on human health. It provides a detailed description of the exposure levels of EMFs in residential and work environments. The article examines the international and European standards and regulations regarding occupational exposure to EMFs encountered in industrial activities. It discusses the categories of work equipment or activities that may expose the worker above and under the orientation value. The article also describes the main principles underlying the protection system adopted for the frequency range of 50 Hz to 10 MHz.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003233
EISBN: 978-1-62708-199-3
... Abstract Magnetic field testing includes some widely used nondestructive evaluation methods to inspect magnetic materials for defects such as cracks, voids, and inclusions and to assess other material properties, such as grain size, texture, and hardness. This article discusses the principles...
Abstract
Magnetic field testing includes some widely used nondestructive evaluation methods to inspect magnetic materials for defects such as cracks, voids, and inclusions and to assess other material properties, such as grain size, texture, and hardness. This article discusses the principles of such defect detection, providing details on the origin, generation, and assessment of leakage field data. In addition, it discusses the metallurgical and magnetic properties of magnetic materials and the applications of magnetic field testing.
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Published: 01 August 2013
Fig. 7 Magnetic permeability as a function of temperature and magnetic field intensity. Source: Ref 6
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Published: 09 June 2014
Fig. 14 Magnetic properties of steel. (a) Effect of temperature and magnetic field intensity on relative magnetic permeability of medium-carbon steel. (b) Effect of carbon content on Curie temperature of plain carbon steel at a sufficiently slow heating rate. Source: Ref 1
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Published: 09 June 2014
Fig. 23 Magnetic field distribution (a) without and (b) with a U-shaped magnetic flux concentrator located around the central leg of a split-return inductor. Source: Ref 19
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Published: 09 June 2014
Fig. 10 Effect of temperature and magnetic field intensity on relative magnetic permeability of low-carbon steel. Source: Ref 10
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Published: 01 November 2010
Fig. 9 Relative magnetic permeability as a function of magnetic field intensity (range 100 to 1500 A/in., or 39 to 590 A/cm) and temperature (range 10 to 750 °C, or 50 to 1382 °F). Source: Ref 55
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Published: 01 January 1986
Fig. 1 In the presence of a magnetic field H 0 , the net nuclear magnetization M precesses around the z axis with angular frequency ω 0 . The time period for one revolution is termed the Larmor period.
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in Properties of Pure Metals
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 36 Effect of magnetic field direction on Hall coefficients of iron at 27 °C. φ is the angle between the magnetic field and the [100] axis when current is passed along the [001] axis. Source: Ref 114
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Published: 31 October 2011
Fig. 8 Macrograph showing effect of superimposed magnetic field on electroslag weldments. (a) Field present. (b) Field absent. Original magnification: both 1.6×. Source: Ref 9
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in Principles of Superconductivity
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 5 Plot of magnetization versus applied magnetic field for two classifications of bulk superconductors. (a) Type I. This type exhibits a complete Meissner effect (perfect diamagnetism). The internal field (given by B = H − 4π M ) is zero. Above H c the material is a normal conductor
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in Principles of Superconductivity
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 23 Effect of applied magnetic field on the critical current of the total loop in a two-junction superconductor. (a) The dc SQUID consists of two junctions carrying a bias current ( I ). The voltage ( V ) is measured as a function of the magnetic field. (b) In the presence of a magnetic
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Published: 01 January 1990
Fig. 14 Pinning force density as a function of reduced magnetic field for a series of bronze-processed Nb 3 Sn wire conductors. Matrix (core). Source: Ref 22
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Published: 01 January 1990
Fig. 28 Plot of current versus magnetic field at 4.2 K for the Nb-Ti and the (Nb, Ti) 3 Sn conductors in a hybrid coil system. Also shown are excitation load lines for the outer magnet (I) and the complete outer magnet. Source: Ref 59
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in High-Temperature Superconductors for Wires and Tapes[1]
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 3 Plot of critical current density versus external magnetic field at 4.2 K to compare two silver-sheathed powder-in-tube superconducting oxide wires (Bi-2212/Ag and YBa 2 Cu 3 O 7 ) with three conventional multifilamentary wires. J c data is for superconductor cross section, also
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in High-Temperature Superconductors for Wires and Tapes[1]
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 5 Plot of critical current density versus external magnetic field at measurement temperature of 77 K to compare sintered powder YBCO tape-shaped wire with melt-processed YBCO tape-shaped wire. Source: Ref 21
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Published: 01 August 2013
Fig. 1 Pattern of electrical currents and the magnetic field in (a) a solenoid coil and (b) conductive materials with induced eddy current (flowing in the opposite direction to the current in the coil). Source: Ref 19
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Published: 01 August 2013
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in Design and Fabrication of Inductors for Induction Heat Treating
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 21 Magnetic field and power density distribution for a 12.7 mm (0.5 in.) heat face with Fluxtrol A for heating of a flat plate
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in Design and Fabrication of Inductors for Heat Treating, Brazing, and Soldering
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 14 Magnetic field generated by a butterfly coil heating a copper plate. The top image shows the effect of adding a magnetic flux concentrating material around the center turns.
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