Induction Soldering Brass Heating Exchanger Of a Series Copper PipeĀ
Objective To solder a brass end cap to a series of copper tubes
Material Preassembled heat exchanger with copper tubes and 2 brassĀ end caps 2.36ā (60mm) OD, 0.08ā to 0.12ā (2 to 3mm) thick atĀ both ends, liquid solder
Temperature 302ĀŗF (150ĀŗC)
482ĀŗF (250ĀŗC)
Frequency 237kHz
Equipment ā¢ DW-UHF-20kW induction heating system, equipped with aĀ remote workhead containing one 1.0Ī¼F capacitor
ā¢ An induction heating coil designed and developedĀ specifically for this application.
Process A dual four turn pancake coil is used to solder 2 brass caps perĀ cycle. Liquid solder is squirted onto the end cap and is heatedĀ for 18 seconds at 302ĀŗF (150ĀŗC) to burn off the flux. Then the
heat is increased to 482ĀŗF (250ĀŗC) for 15 seconds to solder theĀ parts.
Results
Induction heating provides:
ā¢ Even distribution of heating
ā¢ Compared to hot plate, induction heating is able to heat twoĀ parts in 30 seconds vs. one part in 60 seconds
ā¢ Increased production
ā¢ No discoloration with the slow heating process
