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Tubular Products (Pipes, Tubes, Hollow Parts) [.pdf format]

Innovative Induction Heating Technologies

Authors: Valery Rudnev, Doug Brown, Gary Doyon
Publication: Proceedings of Material Science & Technology, Conference & Exhibition (MS&T-08), Pittsburgh, Oct.5-9, 2008
Date: 10/5/2008

Presentation focuses on:

  1. Novel approaches to induction heat treating of critical automotive components, including but not limiting to induction contour hardening of spiral, hypoid and bevel gears with diameters from 6" to 8" (patent pending) and sprockets. Patented CrankPro Technology for non-rotational hardening and tempering of crankshafts (V-4, V-6 and V-8) and camshafts with non-convention journals and lobes.
  2. Specifics of induction hardening of hand tools (i.e., wrench jaws, hammers), fasteners, etc.
  3. Induction heating of large-diameter (8 to 12 in. and larger) billets made from carbon steels, stainless steels and Inconel, including a comparative assessment of progressive multi-stage horizontal induction heating approach vs. static heating using vertical inductors (frequency selection, electrical efficiency, system flexibility, cost, etc.).
  4. FluxManager® - technology for effective heating of carbon steel tubular goods (patented in 2007).
  5. Developing compact and highly-efficient induction tempering and stress relieving systems.

Systematic analysis of induction coil failures. Part 12: Inductors for heating internal surfaces.

Authors: Valery Rudnev
Publication: Heat Treating Process, Professor Induction Series
Date: 7/1/2008

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Four of the most typical coil failure modes when induction heating internal surfaces of a workpiece (for example, holes or inside diameters)are discussed here. Induction heating of internal surfaces of a workpiece can be used in such applications as hardening, tempering, annealing, shrink fitting, stress relieving, brazing, and others. Ways to prevent premature coil failures and making robast and long-lasting internal inductors are discussed here as well.

Innovative induction heating of oil country tubular goods

Authors: Peter Ross, Valery Rudnev, Rich Gallik, George Elliott
Publication: Industrial Heating
Date: 5/1/2008

The stress relieve operation is an important step in the manufacture of a quality connection of tubes and pipes. Improper heat treatment could result in several undesirable phenomena from total joint failure to a type of bi-metallic corrosion known as "ring-worm corrosion" that occurs in improperly stress relieved or normalized pipes. Stress relieving is typically done prior to machining of the thread. In order to achieve the best stress relief, the upset end must be uniformly heated along the entire swage length as well as through the entire wall thickness of the pipe. Article discusses novel induction heating technology - FluxManager that provides superior axial and radial temperature uniformity that is imperative for manufacturing quality tubular goods.

Designing inductors for heating internal surfaces

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 1/1/2005

Induction heating of the internal surfaces of a workpiece for applications such as hardening, tempering, annealing, shrink fitting, and brazing has several unique features related to the physics of the process and the selection of process parameters, compared with heating of external surfaces. There are four main coil styles for heating internal surfaces: solenoid-type cylindrical coils (single-turn and multiturn), rod-type coils, hairpin inductors (single or double), and "C"-core coils. This article reviews design features of solenoid-type internal coils (also called inside diameter or ID coils), which are the most popular inductors for heating internal surfaces.

A fresh look at induction heating of tubular products: Part 2

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 7/1/2004

Part 2 focuses on selective induction heating of tubular products. Applications made possible by induction's ability to concentrate the heat within a specific area of a workpiece include localized stress relieving, brazing, parting, friction welding, bending, annealing of welds, etc.

A fresh look at induction heating of tubular products: Part 1

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 5/1/2004

Part 1 discusses the major differences between induction heating of tubular products and solid cylinders (frequency selection, coil efficiency, etc.), and reviewed several important applications of induction for in-line heat treating and coating of metal tubes.

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