Brazing Brass to Aluminum with Induction
Objective: Copper ‘tees’ and ‘ells’ are to be brazed to the aluminum body of a refrigeration valve
Material customer’s valve copper fittings braze
Temperature 2550 ºF (1400°C)
Frequency 360 kHz
Equipment DW-UHF-10KW induction heating system including a workhead containing two 1.5μF capacitors (total 0.75μF) and a three-turn helical coil
Process The valve is placed inside the coil and RF power is applied until the part is heated to the required temperature and the braze is seen to flow into the joint. Two tube sizes were run using the same induction system settings with differing cycle times.
Results/Benefits • energy is applied only to the zone to be heated • heating of the joint/braze is uniform and repeatable