Abstract
THE increasing interest which is being taken in electrical heating in connexion with heat-treatment of metals is exemplified by a pamphlet received from the Integra Co., Ltd., 183 Broad Street, Birmingham, as agents for the Leeds and Northrop Co., of Philadelphia, Pa., U.S.A. The necessity for the accurate heat treatment of expensive engineering steel parts is emphasised, the advantages of electric heating for this purpose, coupled with the exact control which is thus rendered possible, being probably ideal. The specific advantages possessed by electrical heating for hardening tools, dies, and similar articles are, in many cases, an increase of life due to accurate control of the time of heating and of the quenching temperature, reduction to a minimum of tools broken in the hardening and in distortion, and the possibility of treating the steel under conditions which do not lead to decarburisation. The equipment is flexible in the sense that it can be added to from time to time, and possesses the very marked industrial advantage that, since little heat escapes from the furnace into the room, the hardening plant can be put in the “line of production.” The working conditions can also be made very much more pleasant than is often the case with other methods of heating. Electrical heating lends itself to accurate pyrometric, and often automatic, control, with a decrease in the amount of skilled labour required.
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Electrical Heating of Metals. Nature 122, 258 (1928). https://doi.org/10.1038/122258a0
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DOI: https://doi.org/10.1038/122258a0