Numerical Simulation Of Weld Stress Field After Welding Trailing Based On The Finite Element

Welding as an essential of modern manufacturing technology, has been in the field of material processing plays an important role. Arc welding is a process that involves physics, heat transfer, metallurgy and mechanical complexity of the process of welding, including welding, electromagnetic phenomena, heat transfer, metal melting and solidification, phase change cooling, welding stress and deformation. Welding processes welding stress and deformation, not only affect the manufacturing process of welding the structure, but also the performance of welded structure.The generation of these defects is the welding thermal process caused unreasonable. Transient due to the high concentration of heat input and welding in the welding process will generate significant residual stresses (welding residual stress) and deformation (residual welding distortion, welding shrinkage, warpage welding), and the welding process and the dynamic stress and welding residual stress component of the deformation and welding defects, and to some extent also affected the structure of the machining accuracy and dimensional stability. Therefore, in the design and construction must fully consider the characteristics of welding stress and deformation.Welding stress and deformation of the structure affecting the welding quality and productivity, one of the main problems, the existence of welding deformation affects not only the manufacture of welded structures, but also the performance of welded structure. Simple theoretical method used is difficult to accurately solve the practical problem, therefore, in the field of welding technology, using tools as basic experimental research method, the model "theory - experiment - production." But it takes a lot of welding test a large number of human and financial resources. Numerical simulation of production and development of welding production "theory - numerical simulation - production" mode to create the conditions for the development. Welding simulation technology to welding technology is undergoing from experience to science, from qualitative to quantitative leap, which greatly improve the welding and thermal processing of the scientific level, save for the Study of the human and financial resources. Therefore, the welding temperature field and stress field of quantitative analysis, forecasting, simulation significant.The main contents of this paper include: ANSYS environment, surfacing on the plate finite element simulation, combining the characteristics of the workpiece to establish the symmetry of the geometric model for the welding of different parts of the workpiece with different mesh size of the network cell division; use Gaussian function distribution of heat source model, using ANSYS APDL language software program to achieve the movement of heat; using ANSYS powerful post-processing on different time distribution of temperature field analysis of the situation; by the stress on the welding process field of numerical simulation, combined with the mechanical model and plastic welding theory, different time during the welding process and residual stress variation of the stress changes, and the residual stress distribution; on the weld bead after welding with trailing peening stress-strain field the simulation, using this simulation method can be used to eliminate residual stress hammer method best hammering parameters, welding structure for the complex three-dimensional temperature field, stress field analysis provides a theoretical basis and guidance for the finite element analysis in the mechanical analysis of welding and engineering application.