Note: Pre-heating a Truck Axle Seam for Welding
Objective:
To pre-heat the seam of a truck axle to over 300 °F within 15 seconds for a welding application and maintain temperature within the welding zone for 15 seconds after the power is turned off.
End Product:
Truck axle
Equipment:
Ambrell 20 kW induction hrating system
remote heat station with four 1.2 μF capacitors and a specially designed pancake induction coil.
Materials:
Steel truck axle; 350 ð and 400 Ă °F temperature indicating paint
350 ð, 375 ðand 400 Ă °F temperature indicating âÂÂcrayonsâÂÂ
Temperature:
350 °F
Frequency:
135 kHz
Testing:
A fixture was constructed to rotate the axle 400 °F in 15 seconds and the induction coil was placed above the axle. The circumference of the axle (beneath the coil) was painted with 350 ð and 400 °F temperature indicating paint. While the axle was being rotated, RF power was applied for 15 seconds. All of the paint melted, confirming that the axle temperature was above 400 °F. The RF power was shut off and the temperature âÂÂcrayons in were immediately placed against the axle to monitor temperature. The 400 °F crayon did not melt; the 375 °F crayon melted for 15 seconds; the 350 °F crayon melted for 30 seconds.
Benefits:

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