Induction Heating and Heat Treating of Fasteners

by: Justin Mortimer, Dr. Valery Rudnev and Andrew Bernhard Radyne Corp.

An Inductotherm Group Company
211 W Boden St.
Milwaukee, WI 53207 USA
www.radyne.com

In the past decade, heating by means of electromagnetic induction has become an increasingly popular process applied in numerous applications including the fastener industry 1 . Induction heating offers rapid, high intensity, contactless heat generation directly in the surface and subsurface of the fastener at well-defined regions on and in the workpiece. This is a very attractive feature of this technology leading to high productivity with repeatable quality. Highly controllable heat intensities that range from moderate rates (e.g., as low as 3°C to 5°C/s for some tempering applications) to high heat intensities (e.g., exceeding 800°C/s in hardening applications) allow the implementation of optimal process recipes.