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A Moving Mesh Method for Simulation of Transient Keyhole Evolution in Deep Penetration Laser Welding

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Understanding the transient keyhole behaviors plays important roles in improving the weld quality of deep penetration laser welding. Due to the complex physical process of the keyhole phenomena, the mechanisms of keyhole dynamics are still not fully understood. In this study, a moving mesh method based heat transfer model is firstly developed to understand the transient keyhole evolution process in deep penetration laser welding. Several major physics closely relating to the keyhole behaviors, such as multiple reflections Fresnel absorption, melting and evaporation are rigorously considered in the model. Essentials of the implementations of the ray tracing method are detailed. The workpiece temperature field, the free surface keyhole profiles and the keyhole formation speed in deep penetration laser welding of an aluminum alloy and a titanium alloy are calculated and then compared.
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Document Type: Research Article

Publication date: September 1, 2012

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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