How do they bond those tiny wires in a computer? No soldering tip I have is small enough. Heated air is used to solder pre-soldered components to robot-registered spots on the board.
(Have you seen what a resistor looks like? -- a tiny box with metal ends.) But that's not the whole story; there are sometimes little wires involved too--often where you can't see them, like
inside the epoxy.
Themosonic bonding: a little bit of heat, a little bit of pressure, and a little bit of vibration--none are enough by themselves but together they suffice to bond tiny wires together. And the heat is kept low enough to keep from damaging anything else.
Oh, and epoxy is nice for keeping light off of sensitive chips.
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