Induction Preheating Hot Rod Heading With IGBT Heating Units
Objective Heat a waspaloy rod to 1500ĀŗF (815.5ĀŗC) for hot headingĀ application
Material Waspaloy rod 0.5ā (12.7mm)OD, 1.5ā (38.1mm) length,Ā ceramic liner
Temperature 1500 ĀŗF (815.5ĀŗC)
Frequency 75 kHz
Equipment ā¢ DW-HF-Ā 20 kW induction heating system, equipped with aĀ remote workhead containing two 1.32Ī¼F capacitors for aĀ total of .66Ī¼F
ā¢ An induction heating coil designed and developedĀ specifically for this application.
Process A seven turn helical coil is used to heat the rod. The rod isĀ placed inside the coil and power is applied for two seconds
providing enough heat to penetrate the inner core. An opticalĀ 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:
ā¢ Low pressure and minimal residual stress
ā¢ Better grain flow and microstructure
ā¢ Even distribution of heating
ā¢ Improved production rates with minimal defects
