Indução de alta frequência

HIGH-FREQUENCY
INDUCTION HEATING

High-frequency
Induction Heating

BY
FRANK W. CURTYS
Chief Engineer,
Van Norman Company

Second Edition

McGRAW-HILL BOOK COMPANY, INC.
NEW YORK TORONTO LONDON
1950

PREFACE TO THE SECOND EDITION

Induction heating has undergone many improvements during the past few years, largely in connection with application techniques. While principles have remained the same, a better knowledge of their use prevails, and today users of high-frequency generators have a broader selection of coils, fixtures and process data to draw form for the solution of heating problems.
In this edition a more comprehensive analysis of coil design has been included. A work coil is the basis around which induction heating functions. Therefore, by having a wider variety of designs from which choose, the more efficient can a setup be made. Many new forms of coils are described, together with basic principles with which the user of high-frequency equipment should be familiar. The discussion of fixture designs likewise has been expanded, because, along with coils, they form the most important considerations form successfully processing parts by means of induction heat.
Localized hardening and the joining of metal assemblies are the principle uses for induction heating, and the chapters dealing with these two applications include a more comprehensive analysis of production requirements. Types of steels best suited to induction hardening, various means of quenching, soft solders, brazing alloys and fluxes all are treated in greater detail.
Users of high-frequency heating equipment invariably seek technical information relating to application problems and it is in response to this need that the second edition has been enlarged.

Frank W. Curtis

PREFACE TO THE FIRST EDITION

The purpose of this book is to offer the user of high-frequency induction-heating equipment basic technical application details that will serve as a ready