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Published on Dec 7, 2012
Plastic welding is done by a number of different methods. This method vibrates the top plastic part, which is in contact with the descending horn, against a steady opposing plastic part held in place by a fixture. The frequency of the vibrations is very high for a very short duration of just a fraction of a second. The whistle is first assembled with the two halves and a center wall, housing a small pea in each of two chambers. Welding is then completed for each assembled whistle.