The copper strand is twisted according to the process design rules, and the joint can be allowed when twisted, but the distance between any two different joints should not be less than 15 meters and cold pressure welding should be used, the welding interface technology should be improved and maintained neatly, the repair and rolling circle can not be tied, the diameter of the welding head and generally can not exceed 0.2mm, and the two copper strand welding in the adjacent relationship should maintain a certain distance. The interval should be uniform, and the wire should be pre-twisted when twisted to ensure that the wire does not spread or pop open when cut.

 

After the appearance of the twisted copper strand is bright, there is no obvious damage and scratches, no obvious oxidation reaction and discoloration phenomenon, the external color is uniform, no black, no crack, no crack, and the distance is uniform, and then observe the structure of the copper strand, observe the distribution and composition of the copper strand, observe whether there is fracture, loss, stock, and generally observe with the naked eye that meets these standards is a good copper strand.

 

The appearance of copper strand: the purchase of copper strand should be observed from the appearance, and the appearance of good copper strand is brighter without obvious damage and scratches without obvious discoloration caused by oxidation reaction.

 

Copper strand: According to the copper free characteristics of hard copper strand and soft copper strand, it is used in different fields, so it is usually used in places where electricity is required and high tension is required, such as distribution wires and building wires, electrified railways, railway lines, traffic cables and sliding contact lines, and hard copper grounding in power technology.

 

What are the advantages of using copper stranded wire for rail transit wire

 

1. Copper plays an important role in transmitting weak current control signals, and steel wire plays a supporting role in development. According to the different research methods of copper coating to steel wire, it can be divided into electroplating, coating, hot casting, dipping and electroforming. Rail transit wire copper strand product design not only has the strength and toughness of steel, but also has the good conductivity and corrosion resistance of copper. Compared with copper single wire system, it has the advantages of low density, high strength and low cost, and it is the upgrading and upgrading technology product of traditional pure copper single wire.

 

2. The use of copper stranded wire for rail transit wires can reduce the operating temperature, and the copper chain has higher mechanical flexibility compared with the same cross-sectional area. It is widely used for lines with high Q values.

 

3. Copper stranded wire is made of high quality copper wire and tinned soft copper wire. After toughening treatment during processing, the finished product is soft, neat and beautiful.

 

4. Advantages of hard copper strand and soft copper strand:

 

(1) Hard copper stranded wire: high tensile strength, low resistance, good electrical conductivity.

 

(2) Soft copper strand: usually thinner than hard copper strand, its conductivity is particularly high and has the development of toughness.