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It's "ultrasonic weld," rather than "sound weld." Sounds more "engineering-ish," anyway.

This is done by clamping two objects together - usually plastic ones, but thin metal can also be ultrasonically welded - and directing a high-power beam of ultrasonic energy at the mating point. The beam causes heat, which makes the two materials in the joint melt. When they cool down, they're fused together.

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Harry Rogahn

Lvl 10
3y ago

What else can I help you with?