tagline
585-368-2120 | send email
heating

PROCESSES


Annealing

Bonding

Brazing

Forging

Fusing

Hardening

Heat Staking

Heat Setting

Pre-Tinning

Susceptor Heating

Pre-Heating for Welding

Brazing Copper Tube Assemblies

Research 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.


call us 585.368.2120


email send an email


copper brazing diagram

This brazing process required 45 seconds at 1450°F.