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Induction Brazing Copper
Description
Induction Brazing Copper Tube and Pipe With High Frequency Heating System
Objective Braze brass fitting with o-ring to various diameters of copper tube.
Material Various copper tubes ranging from 3/8โ to 7/8โ diameter and 2-3โ long, female brass fittings with o-ring, silver solder rings and glass beaker.
Temperature 1300 ยบF (704 ยบC)
Frequency 283 kHz for the 3/8โ (9.6mm) diameter copper tube 250 kHz for the 7/8โ (19.8mm) diameter copper tube
Equipment โข DW-UHF-20kW induction heating system, equipped with a remote workhead containing two 1.5 ฮผF capacitors for a total of 0.75 ฮผF
โข An induction heating coil designed and developed specifically for this application.
Process A three turn 1.5โ ID helical coil is used to heat the junction of the 3/8โ (9.6mm) dia. copper tube and brass fitting. The brass fitting is placed on a ceramic mandrel in a beaker of water and half of the fitting is submerged in the water to protect the o-ring from melting. Heat is applied for 30 seconds, making the solder ring flow evenly creating a strong aesthetically pleasing bond without overheating the fitting. The 7/8โ (19.8mm) dia. copper tube is brazed with a slightly larger three turn coil.
Results/Benefits Induction heating provides:
โข Ability to direct heat only to the required zone
โข Coil size and geometry allows for easy loading and unloading of finished parts
โข Ability of coil to be used with water bath process allows for stability of the o-ring.