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Systematic analysis of induction coil failures. Pt 1: Introduction

Induction coil failure is a very complex subject because typically there is no single factor responsible for the failure but rather a combination of interrelated factors. At minimum, a coil […]

Computer Modeling – Numerical Computation Techniques

Even a cursory look at a comparison of network meshes used by different numerical methods reveals that depending upon specifics of a particular induction application; a particular type of mesh […]

Without a concentrator, the magnetic flux would spread around the coil or current-carrying conductor and link with the electrically conductive surroundings (auxiliary equipment, metal supports, tools, and fixtures, for example). […]

June 20th, 2011

Coil Failure pt. 2: Current Flow & Crack Propagation

The skin and proximity effects — as well as the “ring,” “slot,” and edge effects — lead to a nonuniform current distribution within a copper coil. Areas of high current […]

May 23rd, 2011

Metallurgical Insights: TT & CTT Diagrams pt. 3

Rapid induction heating appreciably affects the kinetics of austenite formation and carbon distribution within it. Results of computer modeling of induction scan hardening of a shaft using numerical computer modeling […]

May 16th, 2011

Induction Hardening of Gears pt. 2 – 2

There are three ways to quench gears in spin hardening applications (Ref. 1):• Submerge the gear in a quench tank. This technique is particularly applicable for large gears.• Quench “in […]

April 18th, 2011

Coil Failure: pt. 3 – Coil Copper Selection

In induction heating applications longevity of inductor depends upon several factors, including coil copper selection. This article discusses how different copper grades used for fabrication of induction heating coils affect […]

March 14th, 2011

Coil Failure pt. 4: Electromagnetic Edge Effect

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 […]

March 7th, 2011

Common misassumption in induction hardening

Whenever someone is talking about induction heating, reference is often made to the phenomenon of skin effect. In most publications devoted to induction heating distributions of current density and power […]

February 7th, 2011

Coil Failure: Pt. 5 – Effect of Flux Concentrator on Coil Life

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 […]

January 31st, 2011

How do I select inductors for billet heating?

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 […]

January 17th, 2011

Metallurgical Insights: Pt 6: Stripping phenomenon

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 […]

July 25th, 2011

Systematic analysis of induction coil failures. Pt 1: Introduction

July 11th, 2011

Computer Modeling – Numerical Computation Techniques

June 27th, 2011

Physics of flux concentration

June 20th, 2011

Coil Failure pt. 2: Current Flow & Crack Propagation

May 23rd, 2011

Metallurgical Insights: TT & CTT Diagrams pt. 3

May 16th, 2011

Induction Hardening of Gears pt. 2 – 2

April 18th, 2011

Coil Failure: pt. 3 – Coil Copper Selection

March 14th, 2011

Coil Failure pt. 4: Electromagnetic Edge Effect

March 7th, 2011

Common misassumption in induction hardening

February 7th, 2011

Coil Failure: Pt. 5 – Effect of Flux Concentrator on Coil Life

January 31st, 2011

How do I select inductors for billet heating?

January 17th, 2011

Metallurgical Insights: Pt 6: Stripping phenomenon

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