Bi-metallic lugs are designed to prevent galvanic corrosion by keeping aluminum and copper—two different metals—from touching each other directly at the connection point. These lugs feature an aluminum barrel for the aluminum cable and a copper palm for the copper busbar, which are fused together using friction welding. This clever design ensures that the aluminum conductor only inter... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php