DTL series of copper-aluminum wiring terminals are suitable for transition connection of the cireular aluminium wires ,hemiclycle-sector aluminium wires, The material of aluminium and copper is that of L3 and T2 respctively, The technology of friction welding is wonderfully adopted. Therefore they have distinguishing features of strong weld intensity, good nature in electrification, resistant galvanic corrosion and long service life.