Induction preheating welding automotive transaxle

Induction preheating welding automotive transaxle

Objective: To preheat a 3.6” (91 mm) outside diameter steel axle with three weld lines to 662 ºF (350 ºC) with each weld line being heated to temperature within five seconds Material: Customer supplied 3.6” (91 mm) O.D. steel axle Temperature: 662 ºF (350 ºC) Frequency: 121 kHz Equipment: DW-HF-45kW 50-150 kHz induction heating system equipped with a remote heat station containing eight 1.0 μF capacitors in series parallel - A single position internal bore induction heating coil designed and developed specifically for this application. Induction Preheating Process: The steel axel was painted with temperature indicating paint and a thermocouple was attached to the part. The induction heating coil was placed inside the steel axel and the power supply was turned on. This approach enabled the weld line to be heated to 662 ºF (350 ºC) within five seconds as desired by the client. The power supply is capable of being programmed to turn off after the desired heating time – five seconds in this case. Then, the coil can be moved to the second weld line, and the third weld line. Results/Benefits Process: With the coil being inside the axle, it does not get in the way, and it can then easily be moved to the next weld line - Speed: Induction and the proposed process enables the weld lines to be heated to temperature within the targeted time - Free lab testing: This is a new project for the client, and HLQ Lab Service Request testing enabled the client to test their application and an innovative approach was designed

Induction Preheating Welding Automotive Parts

Induction Preheating Welding Automotive Parts With Induction Heating Equipment 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. Material Steel truck axle; 350° and 400°F temperature indicating paint;350°, 375°and 400°F temperature indicating “crayons” Temperature 350°F Frequency 75 kHz Equipment DW-HF-35kW power supply, remote heat station with four 1.2 μF capacitors and a specially designed pancake induction coil. Process A fixture was constructed to rotate the axle 400° in 15 seconds and the induction coil was placed above the axle. The circumference of the axle (beneath the coil) was painted with 350° 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 “crayons” 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. Results The steel axle was heated to over 400°F within 15 seconds and temperatures above 350°F were maintained for 30 seconds after power was turned off, meeting the requirements of the welding application.