DTL-2 series of copper-aluminum cable lug are suitable for transition connection of the circular aluminium wires, hemicyce-sector aluminium wires, power supply cables in the distribution equipment and copper terminals of the electrical equipment. The material of aluminium and copper is that of L3 and T2 respectively. The technology of friction welding is wonderfully adopted. Therefore they have disinguishing features of strong weld intensity, good nature in electrification, resistant galvanic corrosion and long service life.