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Brazing Copper Tube Assemblies

Brazing copper tube assembliesResearch Objective
To heat a copper tube assembly in an inert atmosphere to 1450°F within 45 seconds for brazing without flux or acid wash clean-up.

Parts & Materials Description
Copper tube assembly, temperature sensing paint, braze pre-forms

Temperature Required
1450°F

Induction Heating Equipment
GH IA Vacuum Heating System, 7.5kW power supply, remote heat station with two 1.25 microfarad capacitors (cumulative capacitance of 0.625 mfd.) and a specially-designed inductor (coil)

Operating Frequency
339kHz

Heating Procedure
The testing was done in the ABS Mark 2 containing a mixture of 95% Argon and 5% Hydrogen gas. A specially- designed, four-turn split helical inductor was used to provide optimal heating to the joint area of the tube assembly. After initial tests were conducted with bare parts and temperature sensing paints to establish time-to-temperature and heating profiles, a temperature of 1450°F was reached in 45 seconds to melt the brazing pre-forms.

Conclusion
Successful results were achieved at 1450°F within 45 seconds. Since the heat conducts through the tube assembly, subsequent joints on the same assembly would require less time. Brazing copper tube assemblies is an excellent application for induction heating

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