Intermetallic layers in temperature controlled Friction Stir Welding of dissimilar Al-Cu-joints
Intermetallic layers in temperature controlled Friction Stir Welding of dissimilar Al-Cu-joints
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DOI：
10.1088/1757-899x/373/1/012017
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
R. Marstatt;M. Krutzlinger;J. Luderschmid;G. Constanzi;J. J. Mueller-J.;F. Haider;M. F. Zaeh
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文献类型：
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作者：
R. Marstatt;M. Krutzlinger;J. Luderschmid;G. Constanzi;J. J. Mueller-J.;F. Haider;M. F. Zaeh
搅拌摩擦焊(FSW)可以连接铝和铜等不同的金属组合，这在现代电气应用的生产中具有很高的兴趣。与传统的熔焊工艺相比，焊缝中金属间化合物相的数量显著减少。由于在搅拌摩擦过程中通常达不到固相线温度，金属间化合物相的生长受到阻碍，金属间化合物层厚度通常保持在几百纳米的范围内。这些层提供了物质对物质的结合，这是主要的连接机制。最新的研究证实，层的形成很可能是由加工过程中的热输入驱动的。因此，焊接温度是获得高质量接头的关键。在本研究中，采用温控搅拌摩擦焊将铝板和铜板焊接成搭接结构。使用先进的工具内测量设置来确定精确的温度数据。用扫描电子显微镜(SEM)分析了接头的金相(如金属间化合物相的结构和成分)。结果表明，焊接温度与金属间化合物层厚度及其组织之间存在一定的相关性。与以前的研究相比，温度控制显著改善了这种相关性。这导致了对主要的加入机制的更好的理解。
Friction Stir Welding (FSW) can be performed to join dissimilar metal combinations like aluminium and copper, which is of high interest in modern production of electrical applications. The amount of intermetallic phases in the weld seam is significantly reduced compared to traditional fusion welding technologies. Because the solidus temperature is typically not reached during FSW, the growth of intermetallic phases is impeded and the intermetallic layer thicknesses typically remains on the scale of a few hundred nanometres. These layers provide a substance-to-substance bond, which is the main joining mechanism. Latest research confirms that the layer formation is most likely driven by the heat input during processing. Hence, the welding temperature is the key to achieve high quality joints. In this study, aluminium and copper sheets were welded in lap joint configuration using temperature-controlled FSW. An advanced in-tool measurement set-up was used to determine precise temperature data. Scanning electron microscopy (SEM) was used to analyse metallurgical aspects (e.g. structure and composition of the intermetallic phases) of the joints. The results show a correlation between the welding temperature and the thickness of the intermetallic layer and its structure. The temperature control significantly improved the correlation compared to previous studies. This leads to an enhanced understanding of the dominating joining mechanisms.