钛铝激光振荡焊接熔池动力学及气孔形成机理研究

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Jinbo Yu, Jiahao Song, Xigui Xie, Jianxi Zhou
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引用次数: 0

摘要

为了研究钛合金与铝合金的焊接过程,建立了振动焊接对接的数值模型。采用直线、正弦和圆形三种振荡路径研究熔池内的力分布、焊接温度场以及焊缝内气孔的形成和演化。采用三维高斯热源来表示激光束。采用流体体积法对气液自由表面进行跟踪,采用连续表面力模型对气液界面力进行变换。通过流体流动、表面张力和熔池反冲压力对锁孔坍塌和孔隙形成机理进行了研究。结果表明,采用激光焊接圆形路径的焊接质量最高。值得注意的是,通过实验数据验证了数值模拟结果,圆振荡激光焊接显著降低了Ti-Al异种合金焊接中的焊缝气孔率。确定了偏移量为0.6 mm、振荡幅度为0.6 mm的圆形振荡路径是抑制焊缝气孔的最佳途径。该研究对激光焊接中锁眼塌陷和孔形成的基本机理提供了有价值的见解,有助于推进不同合金的有效焊接策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of melt pool dynamics and porosity forming mechanism of laser beam oscillation welding of titanium and aluminum
In this study, a numerical model of oscillation weld butt joint is developed to investigate the welding of titanium alloy with aluminum alloy. Three oscillation paths, namely, straight, sine, and circular, are used to study the distribution of force in the molten pool, the welding temperature field, and the formation and evolution of porosity within the weld. A 3D Gaussian heat source is used to represent the laser beam. The volume of the fluid method is employed to track the gas-liquid free surface, and the gas-liquid interface force is transformed by using the continuous surface force model. The mechanism of keyhole collapse and pore formation was examined along with the fluid flow, surface tension, and recoil pressure on the molten pool. The results confirmed that the highest welding quality is acquired by using a laser welding circular path. Notably, numerical simulation results are validated through experimental data, and circular oscillating laser welding significantly reduced weld seam porosity in the welding of Ti–Al dissimilar alloys. The circular oscillation path with an offset of 0.6 mm and an oscillation amplitude of 0.6 mm is identified as the optimal approach for suppressing pores in the weld joint. This research provides valuable insights into the fundamental mechanisms of keyhole collapse and pore formation in laser welding, which contributes to the advancement of effective welding strategies for dissimilar alloys.
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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