In the field of wire, copper wire and aluminum wire each occupy a place, but they have different characteristics and use scenarios. Copper wire is favored by many people for its large load capacity, superior flexibility, low resistivity and stability. However, this superiority comes at a price - copper wire costs almost three and a half times as much as aluminum wire. Still, I would advise you not to skimp on copper wire.

Why can't copper and aluminum wires be easily connected? There are three reasons

First, copper and aluminum do not have the same potential, which leads to a galvanic cell reaction that accelerates the oxidation of aluminum. Over time, copper-aluminum joints may have poor contact problems. In order to avoid this situation, the use of copper-aluminum transition wire clips or transition wire tubes is a must.

Second, it involves the field of chemistry. The chemical activity of metals can be high or low, for example, gold hardly rusts, while iron rusts easily. Therefore, if two metals with different activity are placed together, they will affect each other, leading to accelerated oxidation. Aluminum is more active than copper, so the direct connection of copper-aluminum cables will accelerate the oxidation of aluminum and affect its service life.

Then the direct connection of copper and aluminum conductors will form an electrolyte in the air, which will form a galvanic cell. This will cause the aluminum to be subjected to electrochemical corrosion, resulting in increased contact resistance. Due to the large difference in the elastic modulus and thermal expansion coefficient of copper and aluminum, after multiple hot and cold cycles, the contact point may produce a large gap, which further increases the contact resistance. High temperatures in operation will exacerbate corrosion and oxidation, forming a vicious cycle that may lead to high contact temperature, or even smoke and burn.

So, why do copper-aluminum wire joints need to use copper-aluminum transition joints?

Over a long period of time, the connection between copper and aluminum may produce grayish-white aluminum oxide, which will increase the contact resistance, lead to heating, and may even cause a fire. Therefore, the use of special copper aluminum transition clamp is necessary.

If the copper wire and aluminum wire are connected directly, the joint is prone to oxidation, resulting in increased resistance, which may cause damage. This is because aluminum is more active than copper, and many micro-potential micro-cells will be generated at the copper-aluminum bonding surface, resulting in micro-electrical corrosion, and the contact resistance will increase over time.

For power systems, the direct connection of copper and aluminum can cause electrochemical corrosion, so it is necessary to use copper-aluminum transition joints, or tin sheets in the middle of the contact surface, or even a layer of conductive paste. For home connections, tinning the copper wire and then connecting it with the aluminum wire can avoid electrochemical corrosion.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable, home improvement wire and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.