Bimetallic lugs eliminate this problem by providing a bridging between the aluminum and copper sections. They consist of an aluminum barrel connecting to the aluminum cable and a copper palm that mates with the copper terminal. The copper and aluminum components are joined using friction welding, providing a solid, stress-free union. This arrangement eliminates the possibility of dire... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php