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