Can copper and aluminum wires be connected together? why? How to combiation  wire copper and aluminum wire:

1. The copper wire is connected with the aluminum wire, and the electrical corrosion will occur at the connection. Generally, the aluminum wire is corroded first, causing the phase loss to damage the electrical equipment. This is caused by the electrochemical reaction of two different materials. It is recommended to use wire clamps or copper-aluminum joints. Never connect directly. It is necessary to fill a layer of zinc skin as a transition layer in the middle. Because copper and zinc do not produce electric corrosion, aluminum and zinc do not produce electric corrosion, thus solving the copper. The problem of aluminum corrosion.

2. Copper-aluminum joints: one end is a copper joint and the other is an aluminum tube. In the past, it was welded on a copper-aluminum extrusion butt welder. Now there is an advanced copper-aluminum flash butt welder. Of course there are other processes.

3. After the fusion welding, the molecular structure has changed. The aluminum source does not lose electrons, thus eliminating the phenomenon of electric corrosion.

Why use a wire clip?

1: Copper and aluminum belong to different elements. The metal inertness of copper is greater than that of aluminum. That is, the chemical activity of copper is much lower than that of aluminum. When the two metals are connected, the electrochemical reaction will occur, and the aluminum wire will be gradually oxidized. Reduce the mechanical strength and conductivity of aluminum wire

2: Copper wire and aluminum wire will generate heat when passing current, and their resistivity is different. Copper 1.7×10-8 (Ωm) Aluminum 2.9×10-8 (Ωm) When the same current is passed, the aluminum wire generates a large amount of heat, copper. The heat of the wire is small, so it is easy to have a fault at the joint. Cause 3: The hardness of the copper wire and the aluminum wire are different. If the wire is directly connected, the bonding force is not too good. If the wire is stressed, it is easy to get from the copper wire. The connection with the aluminum wire is disconnected. In actual use, the copper wire and the aluminum wire are generally not directly connected, but the copper-aluminum transition plate or the copper-aluminum transition terminal produced by the flash butt welding process, even if it is not directly connected, it should be made of tin-tin. Handling: Common metal ionization energy sequence table (the metal in front can replace the metal behind it from their salt solution) Potassium calcium sodium magnesium aluminum zinc iron tin-lead (hydrogen) copper mercury silver platinum