Note: Brazing Copper Tube Assemblies

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. 

End Product:

copper tube assembly

Equipment:

Ambrell 7.5 kW power supply, remote heat station with two 1.25 ÂľF capacitors (total 0.625 ÂľF), and a specially-designed induction coil 

Materials:

Copper tube assembly
temperature sensing paint
braze preforms 

Temperature:

1450 ÂşF

Frequency:

339 kHz

Testing:

The testing was done in an atmosphere containing a mixture of 95% Argon and 5% hydrogen gas. A specially designed, four-turn split helical coil 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.

Results 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

Benefits:

  • No oxidation, scaling or carbon build-up; parts are cleaned by hydrogen in the atmosphere.

  • No flux needed

  • Eliminates acid wash cleanups 

Brazing Copper Tube Assemblies

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