The Aluminum alloy formed by adding certain metal elements has the advantages of keeping the pure aluminum light and high strength, with σb values up to 24 ~ 60kgf/mm2. This makes its specific strength better than many alloy steel and it has become an ideal structural material to reduce the weight. Aluminum alloy materials are widely used in machinery manufacturing, transport machinery, power machinery and aviation industry, aircraft fuselage, skin, compressor, etc.