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magnetizing current
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Image
Published: 01 August 2018
Fig. 13 Induced-current method of magnetizing a ring-shaped part. (a) Ring being magnetized by induced current. Current direction corresponds to decreasing magnetizing current. (b) Resulting induced current and toroidal magnetic field in a ring
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Image
Published: 01 December 1998
Fig. 9 Induced-current method of magnetizing a ring-shape part. (a) Ring being magnetized by induced current. Current direction corresponds to decreasing magnetizing current. (b) Resulting induced current and toroidal magnetic field in a ring
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Image
in Nondestructive Inspection of Steel Bar, Wire, and Billets[1]
> Nondestructive Evaluation of Materials
Published: 01 August 2018
Fig. 24 Seam indication width versus magnetization current for a 105 × 105 mm (4 1 8 × 4 1 8 in.) 1021–1026 grade steel billet. Seams tested: center of billet face perpendicular to billet surface; seam or portion of seam with width ≧ 0.025 mm (0.001 in.) for a total depth
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Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003232
EISBN: 978-1-62708-199-3
... a detailed account of the portable power sources available for magnetization, and the different ways of generating magnetic fields using yokes, coils, central conductors, prod contacts, direct-contact, and induced current. In addition, the article discusses the characteristics and classification...
Abstract
Magnetic-particle inspection is a nondestructive testing technique used to locate surface and subsurface discontinuities in ferromagnetic materials. Beginning with an overview of the applications, advantages, and limitations of magnetic-particle inspection, this article provides a detailed account of the portable power sources available for magnetization, and the different ways of generating magnetic fields using yokes, coils, central conductors, prod contacts, direct-contact, and induced current. In addition, the article discusses the characteristics and classification, and properties of magnetic particles and suspended liquids. Finally, the article outlines the types of discontinuities (surface and subsurface) that can be identified by magnetic-particle inspection and the importance of demagnetization after inspection.
Image
Published: 01 December 1998
Fig. 10 Current and magnetic-field distribution in a ring being magnetized with a head shot. Because regions at contact points are not magnetized, two operations are required for full coverage. With use of the induced-current method, parts of this shape can be completely magnetized in one
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Image
Published: 01 August 2018
Fig. 14 Current and magnetic-field distribution in a ring being magnetized with a head shot. Because the regions at the contact points are not magnetized, two operations are required for full coverage. With the induced-current method, parts of this shape can be completely magnetized in one
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Image
Published: 01 November 2010
Fig. 27 Magnetic force in current-carrying conductors 1 and 2. (a) Current flow in opposite direction. (b) Current flow in same direction. Source: Ref 1
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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006468
EISBN: 978-1-62708-190-0
... in establishing a set of procedures for the magnetic-particle inspection of a specific part: type of current, type of magnetic particles, method of magnetization, direction of magnetization, magnitude of applied current, and equipment. It concludes with a discussion on demagnetization after magnetic-particle...
Abstract
Magnetic-particle inspection is a method of locating surface and subsurface discontinuities in ferromagnetic materials. This article discusses the applications and advantages and limitations of magnetic-particle inspection. It describes magnetic fields in terms of magnetized ring, magnetized bar, circular magnetization, longitudinal magnetization, and effects of flux direction. General applications, advantages, and limitations of the various magnetizing methods used in magnetic-particle inspection are listed in a table. The article discusses the items that must be considered in establishing a set of procedures for the magnetic-particle inspection of a specific part: type of current, type of magnetic particles, method of magnetization, direction of magnetization, magnitude of applied current, and equipment. It concludes with a discussion on demagnetization after magnetic-particle inspection.
Image
in Principles of Superconductivity
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 17 Comparison of coupling eddy currents in two parallel filaments with those in two twisted filaments. (a) Untwisted filaments couple together in a varying magnetic field by the large eddy currents flowing in the matrix. (b) By twisting the filaments, the inductive area is diminished
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Image
Published: 30 September 2014
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in Magnetically Soft Materials
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 18 Direct current normal induction characteristics of several soft magnetic materials annealed at indicated temperature: A, 79Ni-4Mo-Fe (1175 °C, or 2150 °F); B, 49Ni-Fe (1175 °C, or 2150 °F); C, 2.5Si-Fe (1065 °C, or 1950 °F); D, Air melt iron (845 °C, or 1550 °F); E, 2V-49Co-49Fe (875
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Image
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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Image
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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Image
in High-Temperature Superconductors for Wires and Tapes[1]
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 1 Plot of critical current density versus magnetic flux density to compare properties of powder-in-tube process oxide-base superconductors with that of conventional superconductors. MRI, magnetic resonance imaging; SSC, superconducting supercollider
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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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Image
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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Image
in Properties of Pure Metals
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 7 Direct current magnetization and intrinsic permeability curves for annealed cobalt strip. Intrinsic permeability (μ i ) is the ratio of B to H . Source: Ref 45
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Image
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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in Magnetic Flux Controllers in Induction Heating and Melting
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 2 Effect of magnetic permeability on coil current (a) and efficiency (b); curves generated from computer simulation of heating a flat plate using a single leg of an inductor; 50 kW in the part under the coil face. Source: Ref 3 .
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Image
in Magnetic Flux Controllers in Induction Heating and Melting
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 6 Magnetic field lines and current density for a single-turn OD coil with (left) and without (right) a magnetic flux controller. Courtesy of Fluxtrol, Inc.
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