Mainly solder in as short a time as possible to avoid burning the traces causing them to lift. This means using a good quality temperature regulated iron that does not cool off when applied to the joint to be soldered and is not too hot either.
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when solder IC chips on printed circuit cards
In general no because its easy to overheat the board and lift pads or even entire traces.However where the board has large areas of copper soldered to metal chassis lugs, if you need to unsolder such connections the only tool likely to be able to apply enough heat is a soldering gun.
I cannot imagine a modern embedded system that is not built on a printed circuit board.
The motherboard aka mainboard
Ferric Chloride