Note: Hermetically sealing glass-enclosed resistors
Objective:
Provide a hermetic seal of glass enclosed resistor to a lead
End Product:
Resistor
Equipment:
Ambrell 7.5 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:
Resistor
Kovar rings, 0.1 in (0.254 cm) diameter
Glass tube slightly larger than 0.1 in (0.254 cm) diameter,
0.5 in (1.27 mm) length
Metal lead
Temperature:
900 °F (482) °C
Frequency:
Testing:
A three-turn concentrator plate coil is used to heat the Kovar ring for 500 ms. This causes the glass to melt and seal one side of the resistor. The resistor is then turned over and the process is repeated to seal the other side using a second Kovar ring.
Benefits:
high frequencies) is avoided.

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