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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermoelectric currents and thermoelectric-magnetic effects in full-penetration laser beam welding of aluminum alloy with magnetic field support
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Thermoelectric currents and thermoelectric-magnetic effects in full-penetration laser beam welding of aluminum alloy with magnetic field support

机译：磁场支撑铝合金全穿透激光束焊接中的热电流和热电磁效应

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摘要

Thermoelectric currents (TECs) caused by Seebeck effect were usually neglected in welding simulation. This paper characterizes the TECs and thermoelectric-magnetic phenomena during the magnetically supported laser beam welding (MSLBW) of thick aluminum (Al) alloy. The simulation is based on a computational fluid dynamic (CFD) model developed in three dimensions. The model considers multi-physical mechanisms including thermal transfer, solid-liquid (S/L) transition, molten metal convection, magneto-hydrodynamics (MHD) and Seebeck effect. The computed TEC distribution in laser welding pool highly depends on welding time and temperature gradient. The large current densities occur near the weld pool edge and the vectors are opposite at both side of SA. interface. The maximum TEC density obtained in the stabilized weld pool is 2.14 x 10(6) A/m(2), leading to a self-induced magnetic field of 2.27 x 10(-3) T and a Lorentz force of 2.62 x 10(3) N/m(3). The influences of TECs on weld pool dynamics are quite limited in LBW but notable in MSLBW. The inversion of MF direction leads to different Lorentz force distributions, weld pool dimensions and seam profiles. The simulation data agrees well with the experimental results. (C) 2018 Published by Elsevier Ltd.
机译：由塞贝克效应引起的热电流（TECs）通常在焊接模拟中被忽略。本文描述了厚铝（Al）合金在磁支撑激光束焊接（MSLBW）期间的TECs和热电磁现象。该模拟基于在三个维度上开发的计算流体动力学（CFD）模型。该模型考虑了多种物理机制，包括热传递，固液（S / L）转变，熔融金属对流，磁流体动力学（MHD）和塞贝克效应。激光焊池中TEC的计算分布高度取决于焊接时间和温度梯度。大电流密度出现在焊池边缘附近，矢量在SA的两侧相反。接口。在稳定的焊池中获得的最大TEC密度为2.14 x 10（6）A / m（2），导致2.27 x 10（-3）T的自感应磁场和2.62 x 10（L）的洛伦兹力3）N / m（3）。 TECs对焊池动力学的影响在LBW中相当有限，而在MSLBW中则很明显。 MF方向的反转导致不同的洛伦兹力分布，焊缝尺寸和接缝轮廓。仿真数据与实验结果吻合良好。 （C）2018由Elsevier Ltd.发布

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