Archive for the 'Stress Relieve' Category

______________________________________________________________________________________________ Is it safe to simply scale down water-cooling requirements when designing smaller inductors? Does it make any difference how multi-turn (e.g., two-turn coil) hardening inductors are connected to water cooling circuits? Several best practices are associated with these seemingly simple questions. This article explores some of these tips, using a case study to illustrate [...]

______________________________________________________________________________________________ When an alternating current flows through an electrical conductor (that is, bus bar or inductor leg), the current distribution is not uniform. Due to the skin effect, approximately 63% of the current will be concentrated within the surface layer of the conductor at what is called the penetration depth. Current penetration depth in copper, [...]

______________________________________________________________________________________________ As it is with human lifetimes, so it is with induction coils—each has a certain ending, yet uncertain timing. I would now like to introduce a new article series. The goal of this series is to provide the induction heating community with both theoretical explanations and practical recommendations that will allow induction heating practitioners, [...]

______________________________________________________________________________________________ Single-turn and multi-turn solenoid inductors are the most popular designs for induction heating of metals. In addition to these traditional designs, many specialized inductors have been developed to address specific features of a particular application, such as geometry of the workpiece, required heat pattern, material handling specifics, process parameters selection, and production rate. Specialized [...]

____________________________________________________________________________________________ Computer modeling is a powerful tool in developing novel technologies, helping to unveil process subtleties, determine optimal recipes, and improving existing technologies. An increasingly important function of computer modeling is determining the robustness of a particular induction heating system, revealing critical factors that affect temperature uniformity within the heated region, identifying ways to improve [...]

April 27th, 2011 : Posted in Computer Modeling, Stress Relieve, Tube and Pipe Heating : Comments Off   

Stress relieving of steel tube/pipe ends is typically done prior to machining of the thread.

January 24th, 2011 : Posted in Induction Heating, Stress Relieve, Tube and Pipe Heating : 0 Comments   

In stress relieving of oil country tubular-steel goods, the typical temperature-uniformity requirement is ±50 ?F at target temperature levels of 700-1250 ?F depending upon the particular steel grade and application specifics. The uniformity achieved in most induction systems is ±80 ?F, however, when heating a variety of pipe sizes, in some instances heat non-uniformity may [...]

The stress-relief operation is an important step in the manufacture of a quality connection. 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. This corrosion takes the form of a ring around [...]

March 4th, 2010 : Posted in Induction Heating, Stress Relieve, Tube and Pipe Heating : 0 Comments   

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. Click here to learn [...]