Brazing Copper Tube with Induction

Brazing Copper Tube with Induction

Objective: To braze a copper tube ( 3/8″ OD by 2-4″ long) into a 3/8″ fitting in less than 10 seconds. Heating must take place in a channel type coil to allow for easy loading of parts.

Material Copper Tubing and Fitting with Braze and Stay Silv White Flux

Temperature 1300°F

Frequency 215 kHz

Equipment DW-UHF-10kw output solid state induction power supply equipped with a standard heat station containing eight 0.33 μF capacitors for a total of 0.66μF, a step down transformer, and a specifically designed induction heating coil.

Process DW-UHF-10kw solid state induction power supply was setup to achieve the following results: · 2.0 kW of power was directly loaded into the copper tube resulting in a heating time of 7.2 seconds to reach the necessary 13000F for brazing.

Results& Processing ease was achieved through the design of a unique channel type coil comprised of three turns of 1/8″ copper.

Induction Brazing Copper Pipe Fittings

Induction Brazing Copper Fittings
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: 585 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 induction heating 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 heating 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