1. Manufacturing process
The copper-clad steel ground wire adopts a horizontal continuous casting production process. The continuous casting process uses an alloyed over-plating layer on the copper bonding surface when the electrolytic copper is heated to 12000C°, and the bimetallic interface is firmly bonded, thereby realizing the ductility metallurgical welding between copper and steel to become a single composite body, which can be drawn arbitrarily like drawing a single metal without disjointing, peeling, and cracking.
2. Excellent anti-corrosion properties
The copper clad steel ground wire has no residue inside the bimetal and has excellent corrosion resistance. The horizontal continuous casting process adopts high-temperature melting, and the residue is calcined and overflows the copper surface, and will not remain in the copper-clad steel grounding wire conductor, so there will be no corrosion inside. The use of flat steel or building foundation as the grounding body affects the reliability of the grounding device due to poor corrosion resistance. The use of galvanized angle steel (round steel) as the grounding body, although slowing down the corrosion of steel, but because zinc is more active than steel, the corrosion rate of zinc is faster than steel. Because the galvanized layer is in contact with the soil, it is constantly corroded and constantly changing, with poor stability and short service life (usually less than 5 years). It is necessary to check the resistance value every year, and the workload is heavy. However, copper-clad metal composite materials are used as grounding bodies and lightning protection conductors. Due to the poor metal activity of copper, it generally does not react with acids, alkalis, and salts. According to the skin effect, when the surface copper layer is larger than 0.25mm, the steel core carries very little current. Making use of the strength of steel, the surface copper layer will not corrode, so the copper clad steel ground wire resistance will not change over time, thus it can realize maintenance-free, and the life span can reach generally up to 50 years.
3. Good electrical performance
The surface layer of copper clad steel ground wire is oxygen-free copper, which has good conductivity, and the inner layer is carbon steel. The skin effect principle is conductive and has excellent magnetic properties. The electrical resistance is much lower than conventional materials such as steel and galvanized steel. The surface layer is oxygen-free copper.
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