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 high welding stress deformation of the rigid structure will cause heat cracks. Thermal conductivity 2) large aluminum (aluminum 0.538 card /Cm.s.℃). About four times stronger than steel, and therefore, when welding aluminum and aluminum alloys, welding steel than to consume more calories. 3) evaporation of the burning of alloying elements. Elements of the aluminum alloy having a low boiling point (such as magnesium, zinc, manganese, etc.), Texas recovery engine, electric arc at high temperatures, burning easily evaporate, 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. Perforated aluminum honeycomb structure constructed sound-absorbing ceiling panels perforated aluminum panels with perforated back, relying on high-quality adhesives and aluminum honeycomb core bonded directly into the aluminum honeycomb sandwich structure, honeycomb core with a layer of sound-absorbing panels and the rear plate affixed cloth. Since the honeycomb core aluminum honeycomb interior divided into a number of closed chamber, Wuxi engine recovery, to prevent air flow, so that hindered sound waves to improve the absorption coefficient (up to 0.9 or more), the recovery of diesel engine, while improving the strength of the plate itself so monolithic sheet size can do more, and further increased design freedom. According to room acoustics design, engine scrap recycling, different perforation rate design, within a certain range control sound absorption coefficient of composite structure, both to meet the design effect, and also be able to reasonably control costs. By controlling the hole diameter, pitch, and can change according to customer requirements perforation rate, the maximum perforation rate <30%, pore size generally used ∮2.0, ∮2.5, ∮3.0 other specifications, requirements and perforated back panel the same, the use of sound-absorbing cloth quality woven fabrics and other sound-absorbing material. Suitable for subway, theaters, radio, television, textile, and noise over the standard factory buildings and the sound of stadiums and other large public buildings acoustic wall panels, ceiling panels. Engine cost of recycling, Texas engines recovery, Shengxin recycling scrap metal recycling scrap metal from the Linyi City Shengxin Limited. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) strong, credible, in Linyi, Shandong scrap metal industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shengxin scrap metal recycling into the brilliant and you work for a better future!