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