Interesting facts about aluminium, copper and more
The anodizing procedure is an oxidation process. Through the anodic polarization of aluminium, an electrolyte is formed (e.g., sulphuric acid) on the oxygen anode, which reacts with the aluminium. It forms aluminium oxide, which is firmly anchored to the surface of the aluminium anode or the metal surface. Even with mechanical means, it is not possible to loosen it from its metallic foundation any further. It forms a resistance to current flow and is penetrated by the applied band tension. This results in penetration pores into which the electrolyte enters, and the oxide formation process increasingly progresses. So that the oxide layer has a higher resistance to all types of humidity, the pores of the freshly anodized strip are further post-treated and thereby sealed. The resulting layer is stronger and more resistant compared to naturally occurring layers.
Cold pressure welding
The cheapest and easiest way to produce electrical connections in anodized strips is carried out with cold pressure welds. The surfaces are joined together under high pressure at room temperature, resulting in molecular connections that have proven very successful from both a mechanical and an electrical standpoint. All welds between aluminium and copper are possible. (Al-Cu, Al-Al).
In contrast to the cold pressure welding process, ultrasonic welding is carried out under considerably less pressure. Since the heat generated by the ultrasonic energy contributes only negligibly to the formation of the connection, ultrasonic welding is considered to be a cold welding process from a metallurgical perspective. All welds between aluminium and copper are possible (Al-Cu, Al-Al).