Note: Braze Copper Tube to Brass Fitting
Objective:
To use induction heating to braze a copper tube to a brass fitting using a preform braze wire. Processing is to occur under an atmosphere of Nitrogen and 4% hydrogen gas. The braze preforms melt at 1190 °F, but the parts need to be kept below 1300 °F. The parts need to be processed at a rate of 175 to 200 per hour which translates into 18 seconds of heating time per part.
End Product:
Copper/Brass tube
Equipment:
Ambrell 7.5kW output solid state induction heating power supply with three (3) busses, eight (8) capacitors totaling 0.66 μF, and a unique four turn helical coil.
Materials:
Copper Tubing Measuring 0.5" OD and 2" Long Brass fitting Braze Preform
Temperature:
Above 1190 °F but not to exceed 1300 °F
Frequency:
133 kHz
Testing:
The Ambrell 7.5kW output solid state power supply along with a unique four turn helical coil were used to achieve the following results.
Benefits:
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The requested atmosphere was provided under a bell jar by supplying 95% Nitrogen/5%Hydrogen at a rate of 25-30 cfh.
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A heating cycle of only 10 seconds was necessary to attain sufficient braze flow which surpasses the required limit of 18 seconds.
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