激光束与铝/钛重叠接头相互作用的研究

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
M. Raja Kumar, I. Tomashchuk, J. Jouvard, M. Duband
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引用次数: 0

摘要

异种激光焊接在重叠结构中的原位分析在工业中应用最为频繁,因此越来越受到研究界的关注。本研究利用发射光谱和高速成像技术研究了 Yb:YAG 激光脉冲在纯钛和铝合金 A5754 的重叠焊点上的蒸汽羽流行为。在重叠接合处施加 15 毫秒长的激光脉冲,在接合处顶部放置钛和 A5754。所获得的结果与撞击区的死后观察结果以及钥匙孔演变的有限元模型进行了相关性分析。这些方法的结合有助于制定一个全面的过程现象时间表,并对所采用的在线方法的有效性进行评估,以确定底部材料与熔化区的关系。所考虑的配置显示出非常不同的行为:在顶部放置反射 A5754 的情况下,使用高激光功率会在底部钛板上产生强烈的键孔传播,导致元素之间的快速混合,而在顶部放置钛板的情况下,使用较低激光功率会在与反射 A5754 的界面上产生长时间的键孔停滞。高速成像显示出羽流的波动性很强,在键孔尖端进入底部 A5754 板后,热辐射和原子辐射急剧下降,或者在键孔到达底部钛板后,富钛射流出现强烈的周期性爆发,从而显示出底部材料的参与。发射光谱的结果与底部材料进入熔化区的情况相吻合,但受到羽流波动和顶板挥发性元素污染的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The investigation of laser beam interaction with aluminum/titanium overlap joint
In-situ analysis of dissimilar laser welding in overlap configuration, which finds the most frequent application in industry, attracts an increasing attention of the research community. In the present work, emission spectroscopy and high-speed imaging were used to investigate the vapor plume behavior during a Yb:YAG laser pulse on the overlap joint between pure titanium and aluminum alloy A5754. A 15 ms long laser pulse was applied to the overlap joints, where titanium and then A5754 were placed on the top. Correlation of the obtained results with post-mortem observation of the impact zones and with a finite-element model of the keyhole evolution was performed. The combination of these approaches facilitated the development of a comprehensive phenomenological timelines of the processes, along with an evaluation of the efficacy of the employed online methods to discern the involvement of the bottom material with the melted zone. The considered configurations showed very different behavior: with reflective A5754 placed on top, the use of high laser power produced an intense keyhole propagation in bottom titanium plate, inducing rapid mix between the elements, while with titanium on top, the use of lower laser power produced prolongated keyhole stagnation at the interface with reflective A5754. High-speed imaging showed very fluctuating behavior of the plume, where the involvement of the bottom material was traduced either by a drastic drop of thermal and atomic emission after the keyhole tip enters the bottom A5754 plate, or by strong periodic bursts of Ti-rich jet after the keyhole reaches the bottom titanium plate. The results of emission spectroscopy were found in adequation with the involvement of bottom material into the melted zone, however, they are affected by plume fluctuations and by the pollution of the top plate by volatile elements.
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来源期刊
CiteScore
4.70
自引率
8.30%
发文量
166
审稿时长
3 months
期刊介绍: The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).
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