Aluminum alloy has been used in buses as early as 1910. Up to now, most of the tank cars, semi trailers and truck bodies are aluminum products. And each commercial vehicle uses about 4 tons of aluminum. The application of aluminum alloy in automobile can bring many benefits, such as: more efficient, higher strength weight ratio, which can meet the requirements of complex shape. In today's increasingly severe period of fuel and environmental problems, aluminum alloy plays an important role in promoting vehicle lightweight and improving fuel efficiency, so as to help alleviate energy and environmental problems. Typical alloys are: 5182, 5083, 6016, 6011, 6n12, 6014, 6181a, 6009, 6005A, 6061, 6082, etc.