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low-frequency power supplies

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220009
EISBN: 978-1-62708-341-6
... to the sheet, rather than parallel to it, as it would be for a solenoid coil surrounding the sheet. Known as transverse-flux induction heating, this method allows the use of less-expensive, low-frequency power supplies in order to obtain reasonable heating efficiencies. A precise relationship for R eq...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220085
EISBN: 978-1-62708-341-6
... of hardening (b) , cm (in.) Power density (c) , kW/in. 2 (d) Low (e) Optimum (f) High (g) 500 0.038 to 0.114 7 10 12 (0.015 to 0.045) 0.114 to 0.229 3 5 8 (0.045 to 0.090) 10 0.152 to 0.229 8 10 16 (0.060 to 0.090) 0.229 to 0.305 5 10 15 (0.090 to 0.120...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220185
EISBN: 978-1-62708-341-6
... cable used to transmit power between medium- or low-frequency power supplies and heat stations: (a) cross section of coaxial cable and (b) cable “broken out” for assembly Source: American Induction Heating Corp. Fig. 8.67 Water-cooled flexible coaxial cable used in radio-frequency induction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220047
EISBN: 978-1-62708-341-6
.... Figure 4.3 shows a typical data sheet used for rating RF power supplies. Because of the different manners in which power ratings are given for low-to-medium-frequency versus RF generators, equivalent ratings for the two types of systems are usually obtained by multiplying the quoted output power for low...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220027
EISBN: 978-1-62708-341-6
... and a capacitor in parallel with an inductor and a resistor Fig. 3.8 Schematic illustration of a capacitor bank used in tuning induction heating circuits for low- and medium-frequency induction heating power supplies. From C. A. Tudbury, Basics of Induction Heating , Vol 2, John F. Rider, Inc., New...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050025
EISBN: 978-1-62708-311-9
... that are needed for low-turn coils. All of the solid-state devices are heated due to the current flow through in operation. The devices must be adequately cooled (generally through water cooled heat sinks) so that they do not lose their operating capabilities. The frequency furnished by the power supply...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050191
EISBN: 978-1-62708-311-9
.... Typical parts that are induction surface hardened include: The single power-supply pulsing process uses a preheat of low or moderate power followed by a high power, for a very short pulse that can be 0.2 to 0.5 s. Experimentation may be needed to select the optimum frequency for a given pitch gear...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050215
EISBN: 978-1-62708-311-9
... with several types of production modes versus cost of equipment and operation. An example of this is the use of several scanners, each hardening parts with low-kilowatt power supplies as opposed to one single-shot system using a large-kilowatt power supply. As discussed above, the area to be induction hardened...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050263
EISBN: 978-1-62708-311-9
... temperature is too low Use a longer heat cycle time Increase power output of induction power supply Improve coil design Improve output bus design to increase efficiency Carbon % too low Obtain variance for lower hardness that is produced Carbon restore or carburize surface Scrap parts...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050001
EISBN: 978-1-62708-311-9
... low-turn work coils. Around 1948, General Electric performed research on the optimum design for output transformers for radio-frequency (RF) induction heaters. They ran tests on both the size of the transformer (settling on 152 mm, or 6 in.) and the stepdown ratio (11:1 found to be most desirable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050009
EISBN: 978-1-62708-311-9
... of the copper shortage). Copper wires are used to carry electricity through power lines because of low heat loss during transmission. Other metals, such as steel, have high resistance to an electric current, so when an electric current is passed through steel, substantial heat is produced. The steel heating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
..., the basic advantages of solid-state power supplies are their improved efficiency, low initial cost and maintenance, and availability in a multitude of sizes and frequencies. Frequencies, efficiencies, power ranges, and features for the four principal types of induction heating equipment are given...
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
... Individual line overheating in power supply or heat station Clogged water line Clean. Check for proper filtering and resistivity Low pressure out of filter Clogged filter Clean or replace High return pressure (reduces flow through power supply) Return water line clogged Clean Return water line...
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
... with concentrators. Source: Ref 12 Fig. 4.6 Electromagnetic end effect for (a) high and (b) low frequency. Source: Ref 10 Fig. 4.29 Single-turn bore coil. Source: Ref 12 Fig. 4.30 Multiturn inside-diameter coil with concentrator. Source: Ref 12 Fig. 4.31 Multiturn 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
... insulation between sheets of laminations, typically above 500 °C, or 930 °F) Fair (less than 250 °C, or 480 °F, because of low working temperature of binders) Machinability Fair Good Resistance to corrosion Fair Good Typical working frequency range 50 Hz to 50 kHz 50 Hz to 800+ kHz...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.9781627083119
EISBN: 978-1-62708-311-9
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050281
EISBN: 978-1-62708-311-9
... supply b. Low-pressure/flow heat station c. Low-pressure/flow coil d. High-temperature power supply e. High-temperature heat station f. High-temperature coil g. Water resistivity low h. System filter needs change 3. Power supply energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290079
EISBN: 978-1-62708-306-5
... gas welding. Oxygen supports combustion of the fuel gases. Acetylene supplies both the heat intensity and the atmosphere needed to weld steel. Hydrogen, natural gas, propane, and proprietary gases are used only to a limited extent in oxyfuel gas welding or brazing of metals with a low melting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
.... 11.25 Schematic illustration of vessel heating using low-frequency induction Source: Cheltenham Induction Heating, Ltd. Fig. 11.1 Polyethylene assembly with a steel ring insert that is joined using induction heating Source: Lepel Corp. Fig. 11.2 Application of induction heating...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220001
EISBN: 978-1-62708-341-6
... to a certain extent in 1922 by the development of motor-generator sets which could supply power levels of several hundred kilowatts at frequencies up to 960 Hz. It was not until the late 1960’s that motor-generators were replaced by solid-state converters for frequencies now considered to be in the “medium...