The induction brazing process, as used for evaporators and condensers in automobile airconditioners, is typically controlled on a percent power and time recipe established through trial and error. However, maintaining a repeatable manufacturing process is difficult, primarily because of inherent variations in work piece location within the induction coil. Feedback from a temperature control device to the induction coil can significantly reduce variability in heating and consequently increase production rates.
Monitoring the temperature of the work piece during an induction brazing process has traditionally been difficult. Although monitoring the junction with a noncontact infrared temperature sensor is possible, there are critical application issues that must be addressed. The primary application issue is alignment - there is the potential for misalignment because of the relatively small target and inherent variations in part location within the induction coil.
A Williamson dual wavelength (ratio) temperature sensor, used to monitor the junction temperature and signal the phase change of the braze material, is a good solution for the challenges associated with aluminium tube brazing applications. Available locally from Temperature Controls, the dual wavelength temperature sensors have a tendency to measure the hottest point in the instrument's field of view. Precise alignment of work pieces within the field of view of the instrument is therefore not critical.
Both Williamson's camera style Model 8000 or the fibre-optic Model 9000, are well suited to induction brazing applications. Fully supported by Temperature Controls, both models ensure reliable monitoring for increased production and throughput.
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