Elements of Induction Heating: Design, Control, and Applications

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ASM International, 1988 - Technology & Engineering - 335 pages
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This book provides an overview of the range of applications of induction heating with methods by which conventional as well as special heating jobs can be designed around the capabilities of the process.
 

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Contents

Process Simulation
178
Coil Design and Fabrication
184
Basic Coil Designs
188
Common Design Modifications
193
Specialty Coils
205
Coil Fabrications
226
PowerSupply Leads
234
Flux Concentrators Shields and Susceptors
241

Determination of Power Requirements
23
Tuning of Induction Heating Circuits and Load Matching
26
Tuning of Induction Heating Circuits
28
Transformers and Impedance Matching
35
Impedance Matching and Tuning for Specific Types of Power Supplies
38
Induction Heating Power Supplies
47
Types of Power Supplies
50
Auxiliary Equipment for Induction Heating
76
Timers
82
Process Design for Specific Applications
85
Design Procedures for Heat Treating
105
Design Procedures for Induction Melting
118
Design of Induction Pipe Welding Operations
128
Design of Induction Brazing and Soldering Operations
135
Fundamentals of Process Control
143
Temperature Measurement
144
TemperatureControl Modes
163
Proportional Controllers and HeatRegulating Devices
164
Integration of Control Functions
166
Distributed Control
170
Miscellaneous Control Technologies Used in Induction Heating
174
Shields
244
Susceptors
247
Materials Handling
253
Materials Handling in Induction Billet and Bar Heating
260
Materials Handling in Induction Heat Treatment
264
Materials Handling in Induction Soldering and Brazing
273
Materials Handling in Other Induction Heating Process
275
Robot Design
278
Special Applications of Induction Heating
281
Bonding Applications of Induction Heating
288
Induction Cap Sealing and Packaging
291
Induction Heating Applications in the Electronics Industry
292
Induction Heating Applications in the Glass Industry
301
Induction Heating Applications in Steel Finishing
303
Vessel Heating
306
Application of Induction Heating for Vacuum Processes
308
Economics
315
Typical Cost Comparisons
320
Index
325
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Page 2 - Steel strip so-called eddy currents dissipate energy and bring about heating. The basic components of an induction heating system are an induction coil, an alternating-current (ac) power supply, and the workpiece itself. The coil, which may take different shapes depending on the required heating pattern, is connected to the power supply. The flow of ac current through the coil generates an alternating magnetic field which cuts through the workpiece.
Page 30 - POWER AND POWER FACTOR Power factor (pf) is defined as the cosine of the phase angle between the current and voltage pf = cos </> If the current lags the voltage as shown in Fig.
Page 24 - ... understanding of the subject or to augment the experimental approach to the application. Determining the Power Requirement The amount of power that will be needed for a given application is one of the major parameters to be determined. If the workpiece is regularly shaped and is to be entirely heated, the calculation is straightforward. However, if it is to be only selectively heated so that the remainder of the workpiece is a heat sink for the generated heat, calculation of the power needed...
Page 24 - For through-heating applications, the power density should be kept relatively low to allow conduction from the outer layers (which are heated more rapidly by higher current densities) to the inner layers. There will always be a temperature gradient, but this can be minimized by careful selection of induction heating parameters. Neglecting the temperature gradient, the absorbed power depends on the required temperature rise AT, the total weight to be heated per unit time W, and the specific heat of...

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