Residual Stress's Simulation On Welding Components Of The Aluminum Alloy High-Speed Train

With the rapid development of high-speed railway in China, the high-speed train speed is continuously increasing. As a result, the production of high-speed train is Corresponding improved in quality requirements. Welding was regarded as an important means of high-speed train production; the welding residual stress and residual deformation have been a difficult issue in the Production process. Not only does residual deformation of the train affect the appearance of shape, but also it will result in deviation of the body assembly dimensions. Welding residual stress on fatigue strength of the train has a greater impact. Therefore, mastering the alloy welding residual stress and residual deformation can provide help for the design and the production.The S YSWELD software was used in this article. It was used for a type of high-speed train simulation of welding aluminum alloy body. Aluminum body is formed by a chassis, side walls and a roof. The materials used are the A5083P-O, A6N01S-T5, A7N01S-T4 and A7N01S-T5. During the welding simulation, the performance parameters of these materials were needed. If the material properties were tested by experiments, it would need the high cost. Therefore, the JMatPro4.1 software was use to calculate these four materials properties in this article and the materials obtained at different temperatures were used to establish parameters of aluminum alloy material database. The variation of heat obtained in the Welding process and thermal cycling curves of components obtained, provided the basis for the stress field analysis through the simulation of temperature field of aluminum body components. Under the existing welding process, the aluminum alloy bodywork component has been simulated stress with SYSWELD software, and analysis welding residual stress distribution rule combining with actual simulated stress. Calculation results show that the maximum of aluminum alloy welding residual stress is in the weld seam appear near and area, and the size is 0.6 to 0.8 for material yield strength. Change the welding sequence and constraint load, and analyzed the influence to the stress field.