3D FEM Numerical Simulation On The Temperature Field Of Laser Cladding By Powder Injection

As an important surface modification method, laser cladding has drawn more and more attention in recent years. The melt pool of laser cladding has a very small size, high temperature, moreover, it contains a very complex physical processes and the microcosmic structure generation processes, it also contains the latent heat, rapid solidification processes, therefore, using experimental methods to measure the temperature distribution in the melt pool is very difficult. Researches on numerical simulation of the temperature fields under different parameters of of laser cladding have attracted many domestic and foreign experts and scholars.ANSYS is a powerful finite element analysis software. It has been widely used in many fields. For the temperature field analysis, ANSYS can calculate nonlinear transient heat conduction problems with very high precision and can resolve the latent heat problems. In this study, ANSYS is used to deal with the temperature fields of laser cladding. The main work are as follows:(1) Based on a great deal of theoretical studies, established the physical and mathematical models of laser cladding by powder injection. According to this model, the energy redistribution of the laser beam and the temperature of powders that interact with laser beam could be educed.(2) Referring to the software ANSYS, put out the boundary conditions during laser cladding process, material parameters and the method to deal with Latent heat problem.(3) Achieve the loading of moving loads by using the APDL language(ANSYS Parametric design language).simulated the process of powder dropping into the melt pool. Analyzed a number of key issues during the simulation process, e.g. presenting and meshing the model, radiation on the exterior of the workpiece, Load-step calculation ,controls of Solutions-Seeking ,etc.