Induction Preheating Hot Rod Heading

Induction Preheating Hot Rod Heading With IGBT Heating Units Objective Heat a waspaloy rod to 1500ºF (815.5ºC) for hot heading application Material Waspaloy rod 0.5” (12.7mm)OD, 1.5” (38.1mm) length, ceramic liner Temperature 1500 ºF (815.5ºC) Frequency 75 kHz Equipment • DW-HF- 20 kW induction heating system, equipped with a remote workhead containing two 1.32μF capacitors for a total of .66μF • An induction heating coil designed and developed specifically for this application. Process A seven turn helical coil is used to heat the rod. The rod is placed inside the coil and power is applied for two seconds providing enough heat to penetrate the inner core. An optical pyrometer is used for close loop temperature control and a ceramic liner is used so the rod does not touch the coil. Results/Benefits Induction heating provides: • Low pressure and minimal residual stress • Better grain flow and microstructure • Even distribution of heating • Improved production rates with minimal defects