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- W2898895235 abstract "In varying polarity gas tungsten arc welding (VP- GTAW) based metal fused-coating additive manufacturing (AM), the surface topographies of deposited layer are more complex than conventional welding, therefore, the distribution of the electromagnetic force in molten pool, arc pressure, plasma shear stress and heat flux on thermocapillary-induced deposited shape are not the same as the conventional welding. A three-dimensional numerical model was developed to investigate the transient thermal-fluid behaviors and the shape evolution of deposited layers in fused-coating AM process of aluminum alloys. Various driving forces of thermocapillary-induced melt flow including arc pressure, Lorentz force, arc plasma drag force and surface tension were taken into account in the model. Numerical prediction regarding the solidified shape and size of a single-track deposited layer is compared with the corresponding experimental data, showing that there is a good qualitative agreement between the two, which indicates that the established numerical model is capable of simulating the complex heat and mass transfer phenomena in the VP-GTAW based additive manufacturing. The thermo-physical process in fused-coating additive manufacturing process is systematically analyzed. Trends in deposition width and height with two major process parameters are captured. It is found that the shape of single-track deposited layers is strongly influenced by substrate moving speed. With an increase in the gap height between the substrate and fused-coating head, there are approximate changing trends in the height and width of deposited layers. The parametric study is prime important to understand and control the metal behavior in a layered deposition format." @default.
- W2898895235 created "2018-11-09" @default.
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- W2898895235 date "2018-11-14" @default.
- W2898895235 modified "2023-09-30" @default.
- W2898895235 title "Numerical investigation of thermocapillary-induced deposited shape in fused-coating additive manufacturing process of aluminum alloy" @default.
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- W2898895235 doi "https://doi.org/10.1088/2399-6528/aaedc7" @default.
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