Induction Preheating Welding Automotive Parts
Description
Induction Preheating Welding Automotive Partsย With Induction Heating Equipment
Objective To pre-heat the seam of a truck axle to over 300ยฐF within 15ย seconds for a welding application and maintain temperatureย within the welding zone for 15 seconds after the power is
turned off.
Material Steel truck axle; 350ยฐ and 400ยฐF temperature indicating paint;350ยฐ, 375ยฐand 400ยฐF temperature indicating โcrayonsโ
Temperature 350ยฐF
Frequency 75 kHz
Equipment DW-HF-35kW power supply, remote heat station with fourย 1.2 ฮผF capacitors and a specially designed pancake inductionย coil.
Process A fixture was constructed to rotate the axle 400ยฐ in 15 secondsย and the induction coil was placed above the axle. Theย circumference of the axle (beneath the coil) was painted withย 350ยฐ and 400ยฐF temperature indicating paint. While the axleย was being rotated, RF power was applied for 15 seconds. All
of the paint melted, confirming that the axle temperature wasย above 400ยฐF. The RF power was shut off and the temperatureย โcrayonsโ were immediately placed against the axle to monitorย temperature. The 400ยฐF crayon did not melt; the 375ยฐF crayonย melted for 15 seconds; the 350ยฐF crayon melted for 30
seconds.
Results The steel axle was heated to over 400ยฐF within 15 secondsย and temperatures above 350ยฐF were maintained for 30ย seconds after power was turned off, meeting the requirementsย of the welding application.
