Arduino Uno Quick Start Manual page 259

Appendix 1. Electronics and Soldering Basics 246
This process depends on a certain temperature, and having the wrong tem-
perature is one of the most common soldering problems. If the temperature
is too low, your solder joints might become fragile, and you also might have
to touch the parts for too long, so you are liable to damage them. An
extremely high temperature can damage your parts right away. Experts can
debate for hours about "the right temperature," but 600℉ to 650℉ (315℃ to
350℃) is a good compromise. Even with cheap soldering irons, you can adjust
the temperature.
Dampen the sponge (it shouldn t be too wet) and clean the tip by wiping it
over the sponge a few times. Then tin the tip by putting a small amount of
solder back onto it. This helps protect the tip, and it also improves the heat
transfer to components:
Soldering is mainly about heat distribution, and now it s time to heat the
joint. Make sure the tip of the soldering iron touches the part (pin header)
and the pad of the breakout board at the same time:
Keep it there for about a second, and then feed a small amount of solder
between the tip and the pin:
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