DTL series if copper-aluminium wiring terminals are suitable for transition connection of the circular aluminium wires,hemicycle-sector aluminium wires power supply cables in the distribution equipment and copper terminals of the electrical equipment.The material of aliminium and copper is that of L3 and T2 respectively.The technology of friction welding is wonderfully adopted.There fore they havr disinguishing features of strong weld intensity,good nature in electrifcation,galvanic corrosion resistant and long service life.