this post was submitted on 20 May 2024
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[–] [email protected] 11 points 7 months ago (5 children)
[–] [email protected] 27 points 7 months ago* (last edited 7 months ago)

What it looks like: You shat all over the board.
What it smells like: Nasty chemicals but only when hot.
What it does: it helps distribute heat, and causes the solder to be less viscuous and stick to metals readily.
What it feels like to start using it: Wow, it's like I just gained one year of soldering experience!
What it feels like to remove it from the board after soldering: Aargh... I swear, one more board and I go buy an ultrasonic cleaner. (Some brands are easier but I usually need to employ a spudger, brush, then alcohol annd Q-tip)

Note that some solder comes with a core that contains flux or some similar substance of that effect.

[–] [email protected] 18 points 7 months ago (1 children)

Cleans and keeps the solder points clean. Prevents oxygen from reaching the solder joint

[–] Blue_Morpho 11 points 7 months ago

This is the best answer. It removes oxides which allows the solder to flow and bond with the metal.

[–] [email protected] 3 points 7 months ago

It makes the tin non sticky. Heat up a blob of solder for a minute or so to evaporate the flux and then try working with it.

[–] [email protected] 3 points 7 months ago
  1. It removes the oxide layer from existing surfaces so the solder sticks and flows better
  2. It increases surface tension of the liquid solder so you get a nice round shape and no whiskers and less bridges
  3. It helps distribute the heat a bit. It works a little bit like thermal paste, especially when the contact area between the tip and the pad/component is very small.

Generally, flux is your friend and soldering without flux is terrible.

[–] mapleseedfall -3 points 7 months ago (1 children)

Lower the melting point of solder

[–] [email protected] 6 points 7 months ago

It may seem like it melts easier since the parts have better thermal contact. But the melting point is intrinsic to the metal alloy