Nd-YAG laser welding characteristics of Inconel 718, microstructures,tensile properties,and hardness of welding joint were researched. Nd-YAG laser welding was carried out on super thin Inconel 718 sheet(0.2 mm thick) with 6 specimens. The welding parameters of these specimens are varied expect for the welding speed(0.3mm/s), gas-flow rate (5L/min) and clearance between focal point and (plate) surface(0).In this research,the tensile strength of welding joint was found to be inferior to base metal and the ductility of welds was considerably lower than base material,the microhardness in weld zone is higher than the base material hardness and the hardness is highest in center zone of welding joint. These conclusions will be in favour of the manufacture with super thin Inconel 718.
The coupled thermo-flowing 3D steady-state model of friction stir welding model is established based on fluid mechanics. With analyzing the impact of pin shoulder and pin on heat producing, the model considers the influence of pin on the heat producing processing. The model applies viscoplastic constitutive equations to describe the material, and turbulence model to simulate the material flowing behavior. With the additional turbulence kinetic energy equations and flow boundary condition equations, the model is established. With Comsol Multiphysics finite analysis software, a process simulation was carried out, and the results reflect that the model can reveal the steady state characteristics of thermo and material flowing behavior of friction stir welding.
. In this paper, the basic theory of Adjacent Boundary Nodes Sliding Method is studied based on C++ and by using ObjectARX as the re-development tool of AutoCAD. During the mesh generation and iteration process, the method of adjusting the orthogonal property between the grid lines and the boundary by using Adjacent Boundary Nodes Sliding Method is elaborated. The orthogonal property of four common structured grids: Laplace, TM, Potential Flow Theory, and WEI Wen-li Method, have been adjusted with this method. Experiment results indicate that the orthogonal property between the grid lines and the boundary is improved obviously by using Adjacent Boundary Nodes Sliding Method to generate two-dimensional body-fitted grids, without changing the original control functions which play a major role in the adaptability of grid lines and physical domain of flow field. A solid base is provided for the subsequent Computational Fluid Dynamics (CFD) calculation.
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