Aluminum wire is often seen in decorative building materials. Aluminum alloy cable is an energy-saving and environmentally friendly product produced by using aluminum alloy as the conductor and using a unique rolling and forming wire strand production process and annealing treatment.

This aluminum alloy cable not only maintains the excellent performance of pure aluminum, but also greatly improves the mechanical equipment It also solves the problems of low tensile strength, poor compressive strength, poor compressive strength creep performance, poor corrosion resistance and poor flexibility of pure aluminum wires, ensuring long-term stable operation of the cable. The emergence of conductor aluminum alloy profiles is a major technological upgrade of cable conductor raw materials, which has triggered a change in conductor raw materials.

Before grasping the safety factor of aluminum alloy cable connection, let's look at a real case. It is a steel plant that uses a large number of aluminum wires. It became popular twice within a year after it was completed and put into operation, resulting in a shutdown of more than half a month and an immediate property loss of 200 million yuan. It can be seen from examples that the large-scale marketing and promotion of aluminum wire in cities, factories and mines in my country has left safety hazards for big cities, factories and mines, and the safety factor of aluminum wire is not very good.

So what is the reason why the safety of aluminum wire connection is not very good? Due to the natural shortcomings of aluminum cables in fire safety and anti-corrosion, they are mainly reflected in the following aspects:

(1) Due to the addition of magnesium, copper, zinc and copper elements to the aluminum alloy cable, the improvement The heat treatment process flow is easy to cause asymmetry in the physical state. Under the action of ground stress and corrosive liquids, aluminum cables will undergo cracking, corrosion and stress corrosion, which is easier to corrode than aluminum cables.

(2) The high temperature resistance of aluminum alloy cables is much lower than that of copper cables, which is due to the decision of the conductor material. The melting point of copper is 1080°C, while the melting point of aluminum and aluminum alloys is 660°C. Therefore, when the aluminum cable exceeds the melting point temperature or the fire accident area, the cable will melt in a short time and the conductivity will be lost. Therefore, aluminum and aluminum alloy profiles are not suitable for use as fire-resistant cable conductors, nor are they suitable for distribution networks, houses, factories, and mines in densely populated large cities.