| 摘要 |
A resonator dimensioned to be resonant along its longitudinal axis at a predetermined frequency of vibration includes a liquid retaining recess therein disposed at or near an antinodal region of longitudinal motion. An electroacoustic converter coupled to one end of the resonator renders the resonator resonant at its predetermined high frequency for activating a liquid, such as molten solder, disposed in the liquid retaining means to effect soldering a workpiece immersed in the liquid of the retaining means. Means move said resonator between a storage tank, whereat to charge said recess, and working position whereat to effect said workpiece treatment.
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