We can often find aluminum alloys in building materials. Aluminum alloy cable is an energy-saving product that uses aluminum alloy as conductor and adopts advanced technology such as special rolling and forming strand production process and annealing treatment. The aluminum alloy wire not only maintains the excellent properties of pure aluminum, but also greatly improves the mechanical properties, and solves the problems of low elongation, poor tensile strength, poor compressive creep performance, poor corrosion resistance and poor flexibility of pure aluminum wire. Long-term stable operation of the cable.

The appearance of conductor aluminum alloy is a major technological breakthrough in cable conductor materials, which has triggered a revolution in conductor materials. However, everyone overlooks an important issue, and that is the safety of cable connections. As we all know, cable problems usually lie in the connection of the cable. So, how safe is aluminum wire?

Before we understand the connection safety of aluminum alloy cables, let's take a look at a real case. A steel plant used aluminum wires in batches. Two fires occurred within a year after the production was put into operation, resulting in a half-month shutdown and a direct economic loss of 200 million yuan. It can be seen from the case that the large-scale promotion of aluminum cables in Chinese cities, factories and mines has left hidden dangers for cities, factories and mines, and the safety of aluminum cables is not very good.

So, what is the reason for the poor connection security of aluminum alloy cables? It is because aluminum cables have natural defects in fire prevention and corrosion protection, which are manifested in the following aspects:

(1) Due to the addition of magnesium, copper, zinc and iron to the aluminum alloy cable, the heat treatment process is added, which is easy to cause physical damage. The state is uneven. When exposed to stress and corrosive liquids, aluminum cables are prone to breakage, delamination, and intergranular corrosion, and are more susceptible to corrosion than aluminum cables.

(2) The temperature resistance of aluminum alloy cables is much lower than that of copper cables, mainly due to the conductor material ok. The melting point of copper is 1080°C, while the melting point of aluminum and aluminum alloys is 660°C. Therefore, when the temperature of the aluminum cable exceeds the melting point or fire zone, the cable will melt in a short time and lose its conductive function. Therefore, aluminum and aluminum alloys should not be used as fire-resistant cable conductors, nor should they be used in densely populated urban distribution networks, buildings, factories and mines.