INDUCTION HEATING TECHNICAL CONTENT

Handbook of Induction Heating (2nd Ed.)

by Dr. Valery Rudnev, FASM

Heating by means of electromagnetic induction is a topic of major significance. In the recently published (Sept. 2017) Handbook of Induction Heating (2nd Ed.), a comprehensive resource on induction heating and heat treating processes, the authors focus on addressing the intricacies of electromagnetic induction heating for the induction thermal community, providing numerous case studies, ready-to-use tables and simplified formulas and graphs.

The new edition (the first edition was originally published in 2002 and maintained a spot on the publisher’s “bestseller” list for the first 10 years) reflects numerous innovations that have taken place over the last decade in the practice and science of induction heating and heat treating, computer modeling, power supplies, failure analysis, quality assurance, and process technology. This technical resource promises to continue to be a synthesis of information, discoveries, and novelties that have been accumulated in industry and academia providing practical, comprehensive knowledge, technical insights, and guidelines.

New Content, Case Studies, and Updated Graphics

The majority of content presented in the first edition has been completely rewritten for the second, and a significant amount of new material has been added. This includes

· Up-to-date content is provided for the following: metallurgical specifics of induction hardening of plain carbon and low alloy steels; process parameters selection for hardening cast irons vs. martensitic stainless steels vs. bearing steels vs. powder metallurgy components; the effect of rapid heating on the kinetics of austenite formation; subtleties of quenching techniques applied in induction hardening; the impact of prior microstructure, its heterogeneity, and the presence of the residuals on hardening results.

· A number of innovative induction technologies specifically developed for automotive, aerospace, off-road machinery, energy, construction, and other industries, have been reviewed, emphasizing equipment designs that maximize metallurgical quality, process robustness, machine flexibility and energy efficiency, while minimizing excessive part distortion and probability of cracking; subtleties of induction hardening and tempering of variety of critical powertrain and engine parts, including gears and gear-like components, stepped shafts, parts with geometrical irregularities (such as holes, shoulders, keyways, undercuts, etc.); a comparison of single frequency vs. simultaneous dual frequency vs. variable frequency on obtaining contour hardening.

· Aspects of components failure analysis and problems associated with reaching excessive temperatures, the occurrence of grain boundary liquation (incipient melting), grain coarsening, and other metallurgical factors are reviewed; simple solutions for typical heat treat challenges and a “fishbone” diagram of cracking are provided; transient and residual stresses are discussed.

· Inventions and innovations related to inductor designs have been reviewed: for example, in single-shot hardening of shaft-like components, a unique inductor design allows the extension of its life more than sixteen-fold compared to the industry standard as verified by the tool-room tags of the users; aspects related to the failure analysis of hardening inductors and induction coils used in different applications and prevention of their premature failures have been examined.

· The discussion of the causes for crack initiation and the propagation during rapid heating and intense quenching and means to control or eliminate cracking has been greatly expanded. Innovative inductor design made achieving almost undetectable distortion when hardening camshafts possible, allowing the elimination of the necessity of a subsequent straightening operation.

· The modular design concept in induction heating of ferrous and non-ferrous (e.g., Al, Cu, Mg, etc.) metallic materials prior to forging, extrusion, rolling, and upsetting is included, as well as efficient induction heating of billets, bars, rods and tubular workpieces; concept of true temperature control and ways to avoid surface and subsurface overheating and billet sticking (fusing) problems.

· Modern low-, medium- and high-frequency power supplies for various needs of induction heating and heat treating are discussed. This includes novel semiconductor inverter technologies, simultaneous dual frequency power supplies, as well as inverters that allow controlling independently and instantly frequency and power (IFP-Technology) during scan hardening. Topology, applicability, troubleshooting and maintenance, and other aspects of typical induction power supplies have been reviewed. Engineering procedures assuring a proper “coil-to-power supply” load-matching characteristics are provided.

· The use of induction heating in brazing, soldering, bonding, shrink fitting, sealing, coating, and other applications is discussed.

· Common misassumptions and misleading postulations associated with the theory and practice of induction heating are clarified in the 2nd edition.

· Best practices and recommendations for equipment maintenance and safety principles are provided. Do’s and Dont’s items are reviewed, along with discussion on the direct and indirect effects of electromagnetic field exposure on health, passive and active medical implants, hypersensitivity, etc. Awareness programs regarding non-ionizing radiation and evaluation of the health risks associated with external field exposure and ways to monitor and control them are included.

· Crucial tips executives must know regarding computer modeling of induction heating processes.

“Three World-Class Experts on Staff”

The 2nd edition Handbook of Induction Heating is intended to reach a wide variety of readers including practitioners, students, engineers, metallurgists, managers, and scientists.

Jon D. Tirpak, PE, FASM; Executive Director, Forging Defense Manufacturing Consortium, and Past President, ASM International (2015-2016) says the following about Handbook of Induction Heating:

“The 2^nd Edition of the Handbook for Induction Heating is equivalent to having 3 world class experts on staff without paying high priced consulting fees. For your seasoned, and probably more importantly, your new and emerging manufacturing and process engineers, this comprehensive guide provides the details your company needs to compete around the world. Significant technical achievements have occurred since 2002 with the last edition. Rudnev, Loveless, and Cook have compiled an indispensable, world-class text replete with the basics and advanced concepts of induction heating. The case studies also illustrate and inspire the design and deployment of innovative concepts which transform theory into application. If you are not reading and using this tour de force, it is safe to say that your competitors have read and marked up their copies.”

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Dr. Valery Rudnev, FASM, is the Director of Science & Technology, Inductoheat Inc., and a co-author of Handbook of Induction Heating (2nd ed.), along with Don Loveless and Raymond L. Cook. The Handbook of Induction Heating, 2nd ed., is published by CRC Press.

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