5 series aluminum alloy use Al and Mg as the main elements, of which the content is between 3% and 6%. It is well known for excellent corrosion resistance, good welding performance, good fatigue strength, low density, high tensile strength and high elongation. It is commonly used in aviation and shipbuilding industry and conventional industries. The typical grades are 5052, 5005, 5083, 5A05,etc.