Why should copper-clad copper be tinned?

Some people may ask, the conductivity of copper-clad copper wire should be better than that of copper-clad copper after tin plating, and when the skin effect is obvious in high-frequency circuits, the performance of copper-clad steel tin-plated and tin-plated wires is far worse than ordinary copper wire. And there are indeed many wires on the market that are tinned. why? Why should copper-clad copper be tinned?
Tinned Copper Clad Aluminum TCCA,Tinned Copper Clad Copper TCCC, It can prevent the insulating rubber from becoming sticky and the wire core from becoming black and brittle, and improve its weldability. Tinned copper is used to increase strength and avoid copper oxidation and corrosion. Improve weldability and reliability. Tinned copper wire is mainly used in rubber-insulated mining cables, flexible wires, flexible cables and marine cables as conductive cores, as well as as outer shielding braid and brush wires of cables.
Therefore, tinned copper wire can prevent oxidation-reduction reactions and produce patina; it can increase heat dissipation; it can improve conductivity and wire performance.

Tinned Copper Clad Steel TCCS