低合金高强度钢超声波振动辅助气体钨极氩弧焊中熔池流动行为的数值模拟

IF 4.6 2区工程技术 Q2 ENGINEERING, MANUFACTURING

CIRP Journal of Manufacturing Science and Technology Pub Date : 2024-10-25 DOI:10.1016/j.cirpj.2024.10.012

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引用次数: 0

摘要

超声波振动辅助电弧焊对焊接接头性能的有利影响已得到实验证实。然而，超声波振动对焊接熔池温度和流场的影响机理尚不清楚，这也限制了该技术的进一步应用前景。本研究建立了低合金高强度钢超声波振动辅助气体钨极氩弧焊（UV-GTA）的三维熔池模型，考虑了熔池表面的自由变形和不同的超声波振幅。系统分析了不同超声波振幅下的温度场演变和熔池流动行为。与 GTA 焊接相比，UV-GTA 焊接中的超声波振动提高了熔池温度分布的均匀性。此外，UV-GTA 焊接中超声波振幅越大，熔池深度和熔池达到准稳态所需的时间越小，但熔池表面和中心的最大流速却越大。在超声波振幅为 40 µm 时，UV-GTA 焊接的熔池深度比 GTA 熔池深度减少了 34.8%。UV-GTA 熔池达到准稳定状态的时间仅为 0.57 秒，熔池中心的最大速度比 GTA 熔池增加了 88.1%。UV-GTA 熔池与 GTA 熔池的对比分析表明，上表面的循环流场较短，内部流场运动呈周期性变化。模拟结果与实验结果紧密吻合，证实了模型的有效性和相关结论的准确性。这项研究可为进一步系统探索超声波振动辅助电弧焊更广泛的应用前景奠定坚实的理论基础。

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Numerical simulation of molten pool flow behavior in ultrasonic vibration-assisted gas tungsten arc welding of low-alloy high-strength steel

The beneficial effects of ultrasonic vibration-assisted arc welding on the performance of welded joints have been experimentally confirmed. However, the mechanism of the influence of ultrasonic vibration on the temperature and flow fields of the welding pool is still not clear, which also limits further application prospects of this technology. The present study established a three-dimensional molten pool model for ultrasonic vibration-assisted gas tungsten arc (UV-GTA) welding of low-alloy high-strength steel, considering free deformation of the molten pool surface and different ultrasonic vibration amplitudes. The temperature field evolution and the molten pool flow behavior under various ultrasonic vibration amplitudes were systematically analyzed. Compared with GTA welding, the ultrasonic vibration in UV-GTA welding enhanced uniformity of the temperature distribution in molten pool. Moreover, the larger the ultrasonic amplitude in UV-GTA welding, the smaller the depth of the molten pool and the time required for the molten pool to reach a quasi-steady state, but the larger the maximum flow rate at the surface as well as at the center of the molten pool. At an ultrasonic vibration amplitude of 40 µm, the molten pool depth in UV-GTA welding decreased by 34.8 % compared with GTA molten pool depth. The time for this UV-GTA molten pool to reach a quasi-steady state was just 0.57 s, and the maximum velocity at its center increased by 88.1 % over that of the GTA molten pool. Comparative analysis of the UV-GTA molten pool and the GTA molten pool revealed a shorter circulating flow field on the upper surface and periodic variations in the internal flow field motion. The simulation outcomes closely align with the experimental findings, confirming both the validity of the model and the accuracy of the pertinent conclusions. This research may lay a solid theoretical foundation for further systematic exploration of the wider application prospects of ultrasonic vibration-assisted arc welding.

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来源期刊

CIRP Journal of Manufacturing Science and Technology Engineering-Industrial and Manufacturing Engineering

CiteScore

9.10

自引率

6.20%

发文量

166

审稿时长

63 days

期刊介绍： The CIRP Journal of Manufacturing Science and Technology (CIRP-JMST) publishes fundamental papers on manufacturing processes, production equipment and automation, product design, manufacturing systems and production organisations up to the level of the production networks, including all the related technical, human and economic factors. Preference is given to contributions describing research results whose feasibility has been demonstrated either in a laboratory or in the industrial praxis. Case studies and review papers on specific issues in manufacturing science and technology are equally encouraged.