在线观看国产又色又爽又黄的视频_欧美专区日韩视频人_99re3在线视频播放精品_69zxx少妇内射无码_亚洲中文字幕永远在线_看试国产更新综合_国产真人一级a毛一级a看免费视频_heyzo爆乳无码大全在线播放_国产熟女一区二区三区灬_久久er20热在这里只有精品

At present, various copper wires are the most used metal wires of power cords. This is because it has good thermal and electrical conductivity and can allow current to pass normally. Although copper wires are widely used in power cords, not all copper wires can be made into core parts of power cords. So what copper wires can be made into the core accessories of power cords?

　　 1. Hard copper wire

　　 hard copper wire is a better copper wire. It is made by cold processing of wire drawing, so it has extremely high tensile strength, and is generally suitable for overhead transmission lines, distribution lines, and construction lines.

　　 2. Soft copper wire

　　With the hard copper wire, then the soft copper wire cannot be omitted. It is a copper wire product produced by removing the cooling processing step after hard copper wire is heated. Its performance is opposite to that of hard copper wire, with good flexibility and flexibility. In addition, its electrical conductivity is very good, and it is widely used in the communication industry, power industry, and electrical machinery industry. It is also one of the wires of various household appliances.

　　3. Tinned copper wire

　　Tinned copper wire, as the name implies, is tinned on the outside of the copper wire. This strengthens the welding performance of the copper wire, protects the copper wire from corrosion during the extrusion of PVC or rubber insulation, prevents the aging of the rubber insulation, and prolongs the service life of the power cord.

　　4. Oxygen-free copper wire

　　 Oxygen-free copper wire means that the oxygen content of copper wire is very low. The oxygen content of general oxygen-free copper wire is below 0.001%, and the copper content is above 99.99%. Therefore, the oxygen-free copper wire will not be easily oxidized, making it fragile, which can be used to make various vacuum tubes and semiconductor wires.

　　 Of course, in addition to these four types of copper wires, there are other types of copper wires as wires. It's just that the four types of copper wires described above are more common and widely used.

Article from: http://www.elejintao.com/newsd-nid-28.html