Copper-clad aluminum wire adopts advanced cladding welding manufacturing technology, which covers the outer surface of the core wire such as aluminum rod or steel wire with high quality copper strip and core, and makes the copper layer and core wire form a firm interatomic metallurgical bond.Two different metal materials are combined into an indivisible whole, which can be drawn and annealed as if a single metal wire were processed. During the drawing process, copper and aluminum are reduced in the same proportion, and the volume ratio of copper layer remains relatively constant.