Bare copper wire
Copper wire that is exposed and lacks any coating is known as bare copper wire. The wire is made by drawing it through a solid copper rod, ensuring that it remains pure. The appearance of the wire is typically yellowish, with varying degrees of darkness or lightness due to the copper's purity. The physical properties of this wire are that it is soft and has excellent electrical conductivity, making it highly useful in various applications.
Tinned copper wire
The production process for tinned copper wire is more complex than for bare copper wire. The pure copper rod is first drawn into silk before undergoing a hot-dip tin plating process, resulting in the deposition of a thin layer of tin on the copper wire's surface, ultimately producing tinned copper wire. This type of wire has a silvery appearance due to the presence of the silver-colored metal tin. Tinned copper wire is a softer material with excellent electrical conductivity. When compared to bare copper wire, it has stronger resistance to corrosion and oxidation, which can significantly extend the service life of low-power cable.
Copper-clad aluminum wire
The production of copper-clad aluminum wire involves a welding technique that coats the outer surface of an aluminum rod core wire with a concentric copper strip. The bonding formed between the copper layer and the core wire is incredibly strong and metallurgical. This process effectively merges the two different metals into an inseparable whole, enabling the wire to be drawn and annealed like a single metal wire. When pulled, copper and aluminum both reduce in the same proportion, while the volume ratio of the copper layer remains constant. However, compared to other wires, copper-clad aluminum wire is lightweight but has lower conductivity and lacks flexibility, making it susceptible to breaking. Its corrosion and oxidation resistance capabilities are also relatively low.