Quartz Crystal Production - Resistance Welding
The encapsulation of the quartz resonator into its electronic enclosure is performed through a variety of sealing methods. The most common method is to use an electrical current to weld the lid or "cap" to the base of the mounting structure. This is known as a resistance weld. Resistance welding is performed with a gas present in the sealing chamber that results in a plasma to create the weld. This means that the included gas is consequently sealed into the resonator enclosure as a residual atmosphere. Although very pure gases are used, unwanted contamination is necessarily introduced which will lead to increased frequency drift over time, known as "aging." Therefore resistance welding, though highly economical, is used for less stringent specifications.
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