Note: Braze a refrigeration tube coil assembly

Objective:

Braze brass fitting with o-ring to various diameters of copper tube. 

End Product:

Brass fitting

Equipment:

Ambrell 10 kW induction heating system, equipped with a remote workhead containing two 1.5 μF capacitors for a total of 0.75 μF An induction heating coil designed and developed specifically for this application. 

Materials:

Ambrell 10 kW induction heating system, equipped with a remote workhead containing two 1.5uF capacitors for a total of 0.75uF An induction heating coil designed and developed specifically for this application

Temperature:

1300 °F (704 °C)

Frequency:

283 kHz for the 3/8 in  (9.6mm) diameter copper tube 250 kHz for the 7/8 in  (19.8mm) diameter copper tube

Testing:

A three turn 1.5 in ID helical coil is used to heat the junction of the 3/8 in (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 7/8 in (19.8mm) dia. copper tube is brazed with a slightly larger three turn coil.

Benefits:

  • Ability to direct heat only to the required zone

  • Coil size and geometry allows for easy loading and unloading of finished parts

  • Ability of coil to be used with water bath process allows for stability of the o-ring 

Braze a refrigeration tube coil assembly

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