The types of copper wires are:

1. Hard copper wire

It is cold processed by stretching wire, with high tensile strength. It is suitable for conductors of overhead transmission lines, distribution lines and construction lines.

2. Soft copper wire

Hard copper wire is made by heating to remove residual stress generated by cooling processing. It is flexible and flexible, and has high conductivity. It is used to manufacture conductors of communication and power cables, electrical machinery and various household appliances.

3. Semi hard copper wire

The tensile strength is between hard copper wire and soft copper wire. It is used for binding of overhead line and wiring of radio.

4. Tinned copper wire

The surface of copper wire is tinned to increase solderability and protect copper conductor from corrosion when PVC or rubber insulation is pressed out, and prevent aging of rubber insulation.

5. Flat angle copper wire

Copper wire with square or rectangular cross-section is used for manufacturing induction coils such as large transformers or large motors.

6. Oxygen free copper wire

Copper wire with oxygen content of less than 0.001% and high purity, with copper content of more than 99.99%, will not be embrittled by oxygen. It is used to make wires in vacuum tubes, wires of semiconductor parts and very thin wires.

7. Enamelled wire

After the copper wire is softened, the surface is coated with insulating paint, which is heated and dried. It is generally divided into natural resin and synthetic resin enamelled wire.

8. Copper foil wire

A conductor wound on a fiber wire with a flat and extremely thin copper wire.

9. Twist before plating

The unplated copper wire is twisted and then plated with aluminum.

10. Copper clad steel

It is generally used for signal transmission along the coaxial line (such as the connection between TV and VCD, outdoor TV antenna, closed-circuit TV, etc.); it has higher tensile strength than the hard line. It is used as an overhead line in high mountain areas and when crossing rivers for a long distance. According to the copper thickness, the general conductivity is 21%, 30%, 40%, etc.

Performance of copper wire:

1. Conductor resistance

The resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area.

2. Conductivity

Based on the resistance of 1 / 58ohm (0.017241 Ohm) of a standard soft copper wire with a length of 1m and a cross-sectional area of 1mm2 at 20 ℃, it is called 100% conductivity. The higher the resistance, the lower the conductivity, which is in inverse proportion.

3. Bending resistance

One end of the single wire is fixed, the other end is added with weight to make it vertically downward, and then bent back and forth 180 degrees until the wire is broken. The more the bending times, the stronger the bending resistance.

4. Breaking force

In the tensile test, the maximum load weight or force applied to the specimen to break it.

5. Tensile strength

The tensile breaking force per unit area that causes the specimen to break during the tensile test.

6. Elongation

At the specified standard distance, the ratio of the increased length of the specimen after elongation to fracture to the original length. The conductor will have different impedance when the temperature is different. Generally, the standard is 20 ℃ or 25 ℃. The higher the temperature, the greater the impedance. In the tensile test, the maximum load weight or force applied to the specimen to break it.

Source: Internet

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