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magnetic induction

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220241
EISBN: 978-1-62708-341-6
..., the high heating rates of induction are needed for processing nonconductors. This chapter describes broad methods of accomplishing such objectives: modification of the field of magnetic induction, use of devices to prevent auxiliary equipment or certain portions of a workpiece from being heated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220009
EISBN: 978-1-62708-341-6
.... , and Bierwirth R. A. , Theory and Application of Radio Frequency Heating , Van Nostrand , New York , 1947 Induction heating relies on two mechanisms of energy dissipation for the purpose of heating. These are energy losses due to Joule heating and energy losses associated with magnetic...
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
... of the magnetizing force required to reduce the magnetic induction to zero after the material has been magnetized. In contrast, soft (or temporary) magnetic materials become magnetized by relatively low-strength magnetic fields, and when the applied field is removed, they return to a state of relatively low residual...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240303
EISBN: 978-1-62708-251-8
... magnetic induction, or flux density, or simply induction and is expressed by the symbol B . Therefore, the magnetic induction B is the sum of the applied field H and the external field that arises from the bar inside the solenoid. The induced magnetic moment per unit volume due to the bar is called...
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
.... , Magnetic Flux Concentrators , Met. Heat Treat. , March / April 1995 7. Rufini R.S. et al. , Advanced Design of Induction Heat Treating Coils , Ind. Heat. , Nov 1998 8. Learman T. , Formable and Thermal Hardenable Concentrator Enhances Induction Heating Process , Ind...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130417
EISBN: 978-1-62708-284-6
... for induction heating and quenching, the use of magnetic flux concentrators to improve the efficiency of surface heating, and the quenching systems used for induction hardening. The discussion also provides information on time-temperature dependence in induction heating, workpiece distortion in induction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000131
EISBN: 978-1-62708-312-6
... (or at any other point on the initial magnetization curve), the magnetizing field H is decreased, then induction B would decrease in an irreversible manner. Line CD in Fig. 8.3 represents a typical reversal from B max . When the value of H equals zero, the corresponding value of B is called...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050009
EISBN: 978-1-62708-311-9
... Abstract This chapter discusses the basic principles of induction heating and related engineering considerations. It describes the design and operation of induction coils, the magnitude and distribution of magnetic fields, and the forces that generate eddy currents in metals. It explains how...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170003
EISBN: 978-1-62708-297-6
.... Magnetically hard materials for use as permanent magnets are also ferromagnetic materials, but are those that are capable by themselves of producing and maintaining relatively high magnetic induction without the aid of external magnetic fields. Permanent magnet materials are based on the cooperation of atomic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220085
EISBN: 978-1-62708-341-6
.... Channel induction melting furnaces are primarily of the line-frequency type. The inductor in this design consists of a coil fitting over a core of magnetic steel laminations. The essential feature of the construction of the furnace is thus a small channel in the refractory vessel which surrounds the coil...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050317
EISBN: 978-1-62708-311-9
... Abstract This appendix provides practical information on induction coils and how they are made. It discusses soldering methods, preferred materials, design challenges, and best practices and procedures. It also discusses the design, construction, and application of magnetic flux concentrators...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220143
EISBN: 978-1-62708-341-6
... the control instrument. Saturable-core reactors are used to control the voltage input into radio-frequency induction power supplies and hence the power available to the induction heating coil. Basically they consist of an iron-core transformer that regulates power flow by controlling the magnetic field...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220185
EISBN: 978-1-62708-341-6
... induction heating. At the point where the leads and coil join, the magnetic field is weaker; therefore, the magnetic center of the inductor (along the axial direction) is not necessarily the geometric center. This effect is most apparent in single-turn coils. As the number of coil turns increases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500301
EISBN: 978-1-62708-317-1
... ). Proximity sensors are used for die protection due to their low cost and compact size. There are three basic types: inductive, capacitive, and magnetic. Inductive proximity sensors are most commonly used and consist of a coil through which a current is applied ( Ref 15.13 ) ( Fig. 15.9 ). As a result...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... from an operational viewpoint, and Table 12.5 lists the characteristics of the same NDT methods. Eddy current, magnetic particle, and liquid penetrant are the most widely used methods for testing induction-hardened parts. Table 12.4 Relative use and merits of various nondestructive testing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
... as for the other surface-hardening techniques. This would include the ability to harden lower hardenability ferrous materials and to have less distortion from processing. The pattern of heating obtained by induction is determined by the (a) shape of the induction coil producing the magnetic field, (b) number...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
... in an induction field, the induced current heats the conductor. It also creates an opposing magnetic flux that tends to push the object into a region of lower field strength–i.e., out of the field (or coil). This force may be computed using the Lorentz equation. If the magnetic field is uniform, there is no net...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... Abstract This chapter discusses the maintenance needs of major components in induction heat-treating systems, including power supplies, heat stations, capacitors, high-frequency output stages, induction coils, water systems, quench systems, and fixturing. induction heating systems...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220047
EISBN: 978-1-62708-341-6
... required for efficient induction heating is determined by the material properties (i.e., resistivity and relative magnetic permeability), the workpiece cross-sectional size and shape, and the need to maintain adequate skin effect. The interrelationship of these factors is described through the equation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050335
EISBN: 978-1-62708-311-9
... that is separate from the coil will heat if metallic and within the area of the induction coil’s magnetic flux field. Therefore, the use of nonmagnetic materials is required for quench rings. Surprisingly, if the quench ring is distant from the coil, such as 25 to 50 mm (1 to 2 in.), and the quench is kept...