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首页> 外文期刊>Journal of Materials Engineering and Performance >Numerical Investigation on Molten Pool Dynamics and Defect Formation in Electron Beam Welding of Aluminum Alloy
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Numerical Investigation on Molten Pool Dynamics and Defect Formation in Electron Beam Welding of Aluminum Alloy

机译：铝合金电子束焊的熔池动力学和缺陷形成的数值研究

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Penetration depth fluctuations and spiking defects, which appear almost simultaneously during partial penetration electron beam welding (EBW) of aluminum alloy, lead to weakened joint strength. In this study, a novel dynamic heat source model, which can be used to understand the coupling behavior between the electron beam and keyhole wall, is proposed to simulate the EBW process. While studying molten pool patterns, the formation mechanism of weld defects is also discussed in detail. In addition, a corresponding experimental test is carried out as verification. The weld bead profile and dimensions predicted by simulations agree well with the experimental data. The periodic oscillation of the molten pool is the root cause of the penetration depth fluctuations. The simulation results show that spiking defect formation has four crucial steps: keyhole collapse, liquid metal backfilling, cutting by the molten pool boundary and liquid metal backfilling. The findings from this work provide a fundamental understanding of the formation mechanism of the penetration depth fluctuations and spiking defects during EBW of aluminum alloy to improve the weld bead quality.
机译：在铝合金的部分熔透电子束焊接（EBW）过程中，熔深波动和尖峰缺陷几乎同时出现，导致接头强度降低。本文提出了一种新的动态热源模型来模拟电子束与小孔壁之间的耦合行为。在研究熔池形态的同时，还详细讨论了焊接缺陷的形成机理。此外，还进行了相应的实验验证。模拟预测的焊缝形状和尺寸与实验数据吻合良好。熔池的周期性振荡是熔深波动的根本原因。模拟结果表明，尖峰缺陷的形成有四个关键步骤：小孔坍塌、液态金属回填、熔池边界切割和液态金属回填。研究结果为铝合金电子束焊熔深波动和尖峰缺陷的形成机理提供了基本的认识，以提高焊缝质量。

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