Brazing Copper Assemblies With Induction
Objective:To heat copper โTโ assemblies to 1400(760) ยบF(ยบC) for brazing
Material: Copper โTโ assemblies,Silver-copper eutectic braze,White flux
Temperature: 1400(760) ยบF(ยบC) Frequency: 250 kHz
Equipment: DW-UHF-20KW, 450 kHz solid state induction powerย supply with a remote heat station containing two 1.32 mFย capacitors (total capacitance 0.66 mF). A custom-designedย induction heating coil.
Process A custom double-wound pancake-helical coil combination isย used to efficiently transfer RF Induction Heating power. Tests were conductedย using temperature indicating paint to establish heating profilesย and time-to-temperature. After the optimum time-totemperatureย of 3-5 minutes is established, a braze ring is placed at the joint and white flux applied to the joint area.ย The first joint on each piece takes 5 minutes with subsequentย joints on the same copper piece taking much less time (~3ย minutes).
Results/Benefits ยท Semi-automatic process reduces amount of operator laborinvolvedยท Easy and effective completion of braze joints