Now-a-days industries are concentrating on those metals, who has higher strength to weight ratio. Thus, many industries such as aviation factories, marine industries, auto industries, packaging industries, etc. are replacing steel structure into aluminum alloy structure. Aluminum alloy has good strength in respect to weight compare to steel. In addition, aluminum alloy possesses outstanding properties such as good corrosion resistance, good conductivity of electricity and heat, good reflectivity of light, non-toxic alloy, recyclable, etc. During the application of aluminum alloys in...