Microstructure analysis and interfacial wave formation mechanism research of Mg/Al dissimilar metal laser impact welding in a vacuum environment

IF 6.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING Journal of Manufacturing Processes Pub Date : 2024-11-05 DOI:10.1016/j.jmapro.2024.11.001
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Abstract

Laser impact welding (LIW) joints for the center exists springback region, resulting in a small effective welding area seriously affects the LIW joints performance problems. This paper for the first time put forward the vacuum environment LIW process, to carry out the vacuum environment of the two dissimilar lightweight metal magnesium/aluminum (Mg/Al) LIW. Results of the research showed that no springback occurred in the welded area. In order to reveal the vacuum environment LIW mechanism, the surface and cross-section morphological characteristics, weld interface microstructure, interface waveform element content and mechanical properties of laser impact welded Mg/Al dissimilar metals were investigated by optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD), energy spectrometry (EDS), and the universal testing machine. Studies have shown that the experimental success rate in the vacuum environment is much higher than that in the atmospheric environment, and the vacuum environment eliminates the springback cracking defect phenomenon generated in the center of the welded joints, which greatly increases the effective welding area of the weld. The number of Mg grain refinement in the interface region of the vacuum environment welding is more, and the bonding force of the two-plate welding is increased. Significant orientation differences, severe plastic deformation and high strain at the weld interface are one of the reasons for the successful LIW. Mg/Al welding samples produced elemental diffusion phenomenon, no obvious melting phenomenon, which is conducive to improving the welding quality. Tensile strength of the welded samples in the vacuum environment was higher than that in the atmospheric environment. Using the SPH-Lagrange coupling method, numerical simulations were carried out to study the trends shear stress, pressure, velocity, temperature and equivalent plastic strain distribution at the weld interface under vacuum environment, which revealed the interface wave formation mechanism in the center of laser impact welded joints with no springback cracking phenomenon. Vacuum laser impact welding opens up a new technology pathway for LIW of Mg/Al welded joints without springback in the center, which plays an important role in improving Mg/Al welding performance.
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真空环境下 Mg/Al 异种金属激光冲击焊接的微观结构分析与界面波形成机理研究
激光冲击焊接(LIW)接头因中心存在回弹区域,导致有效焊接区域较小,严重影响了LIW接头的性能问题。本文首次提出了真空环境下的 LIW 工艺,开展了真空环境下两种异种轻质金属镁/铝(Mg/Al)的 LIW。研究结果表明,焊接区域未出现回弹现象。为了揭示真空环境低温焊接的机理,研究人员利用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)、能谱仪(EDS)和万能试验机对镁铝异种金属激光冲击焊接的表面和截面形态特征、焊接界面微观结构、界面波形元素含量和力学性能进行了研究。研究表明,真空环境下的实验成功率远高于大气环境下的实验成功率,真空环境消除了焊点中心产生的回弹裂纹缺陷现象,大大增加了焊缝的有效焊接面积。真空环境焊接界面区的镁晶粒细化数量较多,两板焊接的结合力增大。取向差异明显、塑性变形严重以及焊接界面应变大是 LIW 成功的原因之一。镁/铝焊接样品产生元素扩散现象,无明显熔化现象,有利于提高焊接质量。真空环境下焊接样品的拉伸强度高于大气环境下的拉伸强度。利用 SPH-Lagrange 耦合方法,对真空环境下焊接界面的剪应力、压力、速度、温度和等效塑性应变分布趋势进行了数值模拟研究,揭示了激光冲击焊接接头中心的界面波形成机理,未发现回弹开裂现象。真空激光冲击焊接为镁/铝焊接接头中心无回弹的激光焊接开辟了一条新的技术途径,对提高镁/铝焊接性能具有重要作用。
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来源期刊
Journal of Manufacturing Processes
Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-
CiteScore
10.20
自引率
11.30%
发文量
833
审稿时长
50 days
期刊介绍: The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.
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