Combining the experiments,a geometricy model with dimensions of 30 mm ×30 mm ×6 mm was established based on the SYSWELD software and Fig.1 shows the mesh generation of the model. The cladding layer size was 30 mm × 4 mm × 1 mm. In the grid division, considering the compatibility of calculation time and accuracy of the results, a higher grid density was used in the coating layer and heat affected zone of the matrix, whereas a sparse grid density was used in the region far from the laser. The matrix x-direction cell mesh was set to a minimum size of 0.38 mm, maximum size of 2.18 mm; the z-direction cell mesh was set to a minimum size of 0.33 mm, maximum of 1.67 mm; and y-direction of 0.5 mm. The size of the partial element grid of the coating layer was set to 0.38 mm ×0.2 mm. The grid size along the direction of the weld line was 0.5 mm. The initial temperature of the sample was 20 C. The matrix material was 316stainless steel, and the coating material was TiC/TiN-Ni/Mo.
Fig. 1. Mesh generation of the model coating.
Fig.2 shows the temperature field distribution of the coatings when the heat source was moved for 5s. The weld width and penetration of the simulation data are shown in Fig.2. The weld width and penetration of experimental data were 3.15 and 1.10 mm for sample 3, respectively(Fig.3). The simulation results are in good agreement with the experimental data, indicating that the temperature distribution simulations of the solar coatings are accurate.
Fig.2. Temperature field distribution of the coatings.
Fig. 3. Macro-morphology of the transverse section of sample 3.
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