1) Weld tendency of large deformation and crack formation. Coefficient of linear expansion and shrinkage of a crystalline aluminum than steel is about twice as large, easy to produce greater stress Hunan ash recycling aluminum welding deformation of the rigid structure will cause heat cracks. Thermal conductivity 2) large aluminum (aluminum 0.538 card /Cm.s.℃). About four times that of steel, aluminum and therefore Hebei ash recycling, when welding aluminum and aluminum alloys, welding steel than to consume more calories. 3) evaporation of the burning of alloying elements. Aluminum containing low boiling point elements (such as magnesium, zinc, manganese, etc.), at a high temperature electric arc, easily evaporate burning ash recycling aluminum, thereby changing the chemical composition of the weld metal, weld performance. 4) low temperature strength and ductility. High temperature strength and ductility of aluminum is very low, undermining the weld metal forming, sometimes also likely to cause collapse of the weld metal and weld wear phenomenon. 5) no color change. Aluminum and aluminum alloy from the solid state into liquid, no obvious color change, so that the operator is difficult to grasp the heating temperature. A variety of aircraft aluminum alloy as the main structural material. Aircraft skin, beams, ribs, stringers, bulkheads and landing gear are made of aluminum alloy. Depending on the aircraft, the use of aluminum is not the same amount. Focus on the economic benefits of civilian aircraft due to cheaper prices and extensive use of aluminum, aluminum accounts for the body weight of the structure such as the Boeing 767 aircraft used by 81%. Military aircraft due to good operational performance requirements and a relative decrease in the amount of aluminum, such as the maximum flight speed of Mach 2.5 high-performance F-15 fighter aircraft using only 35.5% of aluminum. Some alloy has good low temperature performance, it can work in liquid hydrogen and liquid oxygen environment, it concentrated nitric acid and UDMH can not afford chemical reaction, with good welding performance, so it is a good material for the manufacture of liquid rocket. Launch of the "Apollo" spacecraft "Saturn" 5 rocket fuel tank levels, oxidant box, box between the segments, inter-stage section, tail section and the instrument module are made of aluminum alloy. Henan Aluminum ash recycling, Shengxin scrap metal recycling (certification), ash recycling aluminum recycling scrap metal from the Linyi City Shengxin Limited. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) Shandong Linyi, leading scrap metal, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Shengxin scrap metal recycling leadership with the staff warmly welcome all inquiries negotiations to create Shengxin scrap metal recycling better future.