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Joule heating

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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005625
EISBN: 978-1-62708-174-0
... Abstract Resistance welding (RW) encompasses many variations on the basic theme of local Joule heating while an external pressure is applied. This article provides an overview of the most generally applied RW processes, followed by a discussion on the general design aspects of various...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005603
EISBN: 978-1-62708-174-0
... but are sufficiently high to produce changes in the microstructure and in mechanical properties. Three types of energy are used primarily as direct heat sources for fusion welding: electric arcs, laser beams, and electron beams. Oxyfuel gas welding is also used occasionally, and internal joule heating arising from...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001481
EISBN: 978-1-62708-173-3
.... Source: Ref 27 Fig. 10 Joule heating rate ratio versus nondimensional radius. Time, 2 cycles; R c , radius of contact. Source: Ref 27 Fig. 2 Superposition of image sources in finite-thickness plate Fig. 5 Weld-bead dimensions for different durations of heating, t...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005510
EISBN: 978-1-62708-197-9
... magnetic field to produce Lorentz forces that influence the motion of the molten metal (and the slag in ESR). Further, in the ESR process, passage of current produces Joule heating in the slag due to its high resistivity. Fluid motion in the metal pool and the slag is induced by the buoyancy and Lorentz...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005907
EISBN: 978-1-62708-167-2
... for initial heating; the source is Joule heat of induced electrical current in the Mo-ring. Figure 6 shows the ingot of ZrO 2 —the results of melting in an IFCC. The general view of IFCC construction is presented in Fig. 7 . Fig. 6 Inductor furnace with cold crucible: ZrO 2 ingot after...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006453
EISBN: 978-1-62708-190-0
... one of many forms, for example, thermal (e.g., heat lamp or hot air gun), mechanical (applied sonic or mechanical loading), or electromagnetic (induction or Joule heating), and may be applied at a point or over an extended area, at the surface or internally, either instantaneously or over some time...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005552
EISBN: 978-1-62708-174-0
.... For fusion welding, chemical energy sources include combustion of fuel gas with oxygen (oxyfuel welding processes) and exothermic reaction of particulate metals and oxides (combustion synthesis welding processes), while electrical energy sources include arcs (arc welding processes), joule heating (resistance...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005882
EISBN: 978-1-62708-167-2
... process; highlighted nodes are used to plot time histories of temperature, phase, and stress developments. Fig. 14 Heat-generation curve for Joule heating of the surface layer of induction heated straight cylindrical shaft. Fig. 15 Heat transfer coefficient data for PAG-water solution...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005234
EISBN: 978-1-62708-187-0
... conductivity; V l and V s are the velocities of the liquid and solid phases, respectively; and S T is a generic heat source term that may include Joule heating or viscous dissipation. The first term of Eq 6 represents the storage of enthalpy, which is determined by the balance of the other...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005895
EISBN: 978-1-62708-167-2
... metal. The ac running through the coil creates a magnetic field. Voltages are induced in the feed material when it is introduced into this magnetic field, whereby eddy currents are created due to the conductivity of the metal. The inducted current heats the charged material in accordance with Joule's...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005896
EISBN: 978-1-62708-167-2
... of a material by a given amount. In the International System of Units (SI), heat capacity is expressed in joules per degree of kelvin (J/K). A derived quantity that specifies the heat capacity as a property independent of the size of a sample is the specific heat capacity ( C ), often simply called specific...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001450
EISBN: 978-1-62708-173-3
... whole. The basic brazing/soldering process is depicted in Fig. 1 . Assembly heating can be carried out using a variety of means, including electromagnetic induction, Joule heating, ovens, flames, and other forms. Despite a long history of development and usage, those solders used today are still...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005879
EISBN: 978-1-62708-167-2
... ( No. 5 ), 2011 , p 1517 – 1527 10.1108/03321641111152676 Induction heating computations deal with a multiphysics problem containing analysis of several coupled physical fields such as electromagnetic (distribution of eddy current and volumetric joule losses in the heated body), temperature...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005886
EISBN: 978-1-62708-167-2
... of the process to ensure optimal thermal processing. Coil design, including coil windings, geometry, location relative to the component, flux concentrators, and electrical power input all make a significant impact on the coupling of the flux and subsequent joule heating of the material. Computational modeling...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003082
EISBN: 978-1-62708-199-3
...) 8.00 0.289 Hipernik (50% Ni) 8.25 0.298 4% Si 7.6 0.27 10.27% Si 6.97 0.252 Stainless steels and heat-resistant alloys Corrosion-resistant steel castings CA-15 7.612 0.2750 CA-40 7.612 0.2750 CB-30 7.53 0.272 CC-50 7.53 0.272 CE-30 7.67 0.277 CF-8...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005591
EISBN: 978-1-62708-174-0
... heating mechanism, Joule heating. In this case, and neglecting the effect of heat conductivity along the wire and the heat transfer between wire and slag, the equation for the electrode temperature is ( Ref 3 ): (Eq 6) T e = i 2 ρ e S c γ W (Eq 7) S = S dry + S...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001336
EISBN: 978-1-62708-173-3
... emission results from joule heating (resistance) of the cathode by the imposed welding current until the electron energy at the cathode tip exceeds the work function (energy required to strip off an electron). This case applies to the general case of DCEN, where the tungsten electrode is the emitter...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005593
EISBN: 978-1-62708-174-0
... systems. bonding mechanisms electrical characteristics projection welds resistance projection welding solid projection solid-state resistance welding RESISTANCE WELDING PROCESSES are those which incorporate electric currents to facilitate Joule heating. This heating is then used to promote...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005761
EISBN: 978-1-62708-165-8
... a function of I 2 R , or Joule heating. The heating efficiency and intensity as well as temperature distribution depend on several factors. The heating rate is affected by several variables, such as: Magnetic field strength (expressed in units of ampere-turns of the work coil) Frequency...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005877
EISBN: 978-1-62708-167-2
... be applied in the majority of induction heating applications including induction hardening technologies characterized by Joule losses significantly greater than the hysteresis losses. However, in some cases—especially for low-temperature induction heating—the amount of heat released as a result of hysteresis...