Non-uniform coil current distribution resulting from various electromagnetic phenomena has a dramatic effect on induction coil life and crack development in the coil copper. This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Article concentrates on coil copper electromagnetic edge effect, effect [...]
Electromagnetic (EM) forces play the major part in many modern technologies. Motors, magneto-hydro-dynamic (MHD) seals, electromagnetic pumps, levitators, electrical bearings, and springs are some of the modern technologies in which EM forces play a leading role. In some applications, EM forces can reach tremendous values. For example, thanks to a capability to develop incredibly large [...]
Magnetic flux concentrators (also called flux intensifiers, diverters, or flux controllers) are made from high permeability, low-power-loss materials. They are used in induction heat treating applications in a manner similar to that of magnetic cores in power transformers. Article concentrates on effect of magnetic flux concentrators on life of induction coils. Click here to read [...]
Induction heating is widely used to heat metals prior to hot forming including forging, upsetting, rolling, extrusion, and other methods. Billets are heated either in cut lengths or continuously and are forged in presses, hammers, or upsetters, or are extruded. Steel components by far represent the majority of hot-formed billets, although other materials including titanium, [...]
Heat-treat practitioners sometimes observe unusual effects in induction hardening, such as a striping phenomenon and a barber-pole effect that are often considered to a mysterious phenomena. In some applications, striping suddenly occurs and then disappears. Both of these effects may have similar appearance, but their causes are quite different and could be related to a [...]
Magnetic flux concentrators (also called flux intensifiers, diverters, or controllers) are made from high-permeability, low-power-loss materials. They are routinely used in induction heat treating applications in a manner similar to that of magnetic cores in power transformers. This article presents basic information about magnetic flux concentrator materials, its limitations and advantages, and provides design and [...]
Induction does not promote any appreciable corrosion. However, it is well-established that corrosion intensity increases with increasing temperature (regardless of whether the temperature increase is after induction heating or any other heating means, assuming that the rest of conditions remain the same). Therefore, if selected regions of the heat treated part have different temperatures, then [...]
Want longer-lasting inductors? Look no further. HTPro eNews editor Ed Kubel facilitates this informative, FREE Webinar: Avoiding Premature Coil Failures:Design and Fabrication of Long-lasting Inductors. DR. VALERY RUDNEV, FASM | WEDNESDAY, SEPTEMBER 29 | 2 P.M. EST Gain insight into the intricacies of fabricating long-lasting inductors. Discover the causes and prevention methods of premature coil [...]
Induction hardening steel to austenitic temperatures can result in temper back, or annealing of adjacent areas of the material that have been hardened previously. This is particularly important in the induction hardening of crankshafts, camshafts, gears and critical components. This publication discusses above mentioned effect along with some other important features of induction hardening and [...]
In some applications heat treating by induction faces certain challenges. Typical examples would be applications where the workpiece contains longitudinal and / or transverse holes, keyways, grooves, various orientations of hollow areas, sharp corners and other discontinuities. Existence of these features can result in undesirable appearance of hot and cold spots, cracks, and excessive distortion. [...]
Inductoheat - An Inductotherm Group Company
