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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Vapor plume and melted zone behavior during dissimilar laser welding of titanium to aluminum alloy
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Vapor plume and melted zone behavior during dissimilar laser welding of titanium to aluminum alloy

机译：钛羽流和熔化区行为在不同激光焊接到铝合金期间

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摘要

The present study deals with continuous Yb:YAG laser welding of pure titanium to aluminum alloy A5754 performed with different beam offsets to the joint line. Spectroscopic and morphological characterization of vapor plume exiting the keyhole was combined with post-mortem observation and energy-dispersive X-ray spectroscopy (EDX) analysis of the welds. The laser beam centered on the joint line resulted in periodic transversal inclination of a vapor jet on the aluminum side associated with a local increase of melt width and an intense spatter formation. Such behavior can be attributed to the instability of the keyhole wall from the aluminum side. The beam offset on the titanium side led to the stabilization of vapor plume, the attenuation of spattering, and a minimal mixing between the two liquid metals. On the contrary, the beam offset on the aluminum side produced a violent formation of spatters and a highly unstable, diffuse vapor jet. In this case, the liquid metals underwent a violent mixing that was progressively reduced along with the decrease in quantity of melted Ti. The observed spectral regions contained the emission peaks of neutral Ti and Mn. Very few emission lines of Al were observed, because they require higher excitation energies compared to Ti and Mn. Boltzmann linearization using Ti emission peaks allowed the estimation of vapor temperature to be between 5000 and 6000 K, except for the welds with the beam offset on Al.
机译：本研究涉及连续YB：纯钛与铝合金A5754的YAG激光焊接，用不同的光束偏移到连接线。将匙孔离开的蒸汽羽流的光谱和形态学表征与焊浆后验验观察和能量分散X射线光谱（EDX）分析。以关节线为中心的激光束导致蒸汽射流的周期性横向倾斜，铝侧与局部熔体宽度的局部增加和强烈的溅射形成。这种行为可以归因于来自铝侧的钥匙孔壁的不稳定性。钛侧的梁偏移导致蒸汽羽流的稳定，溅射的衰减以及两个液体金属之间的最小混合。相反，铝侧的光束偏移产生了剧烈地形成了溅射和高度不稳定的漫射蒸汽射流。在这种情况下，液态金属经历了剧烈的混合，随着熔化的Ti的量减少而逐渐减少。观察到的光谱区域含有中性Ti和Mn的发射峰。观察到Al的极少发射线，因为与Ti和Mn相比，它们需要更高的激发能量。使用TI发射峰的Boltzmann线性化允许蒸汽温度估计在5000和6000K之间，除了在Al上的梁偏移的焊缝之外。

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