What does FLUX do when soldering an electrical joint?

Flux is an acidic blend that makes a difference evacuate oxides from the range of the joint and so makes a difference the patch stream effectively over the joint and frame a great bond. The flux can be seen as a brown fluid as a patch is warmed, and it in some cases gives off a impactful smoke that can act as a aggravation.

Explanation:

flux prevents oxidation of the base and filler materials. while soldering the metals, flux is used as threefold purpose, as it removes the oxidised metal from this surface to be soldered.

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source apex