Induction Brazing Copper Fittings
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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 285 kHz
Equipment Power of 15KW 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
Material customer’s valve
copper fittings
braze
Temperature 2550 ºF (1400°C)
Frequency 285 kHz
Equipment Power of 15KW 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
Brazing-Copper-Fittings
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