Abstract Aluminum (AA6016) sheets were welded in overlap configuration to investigate the influence of different beam oscillation patterns on the resulting temperature gradient, the local solidification rate and the resulting grain structure and to compare the results with those obtained with the conventional rectilinear welding. Two pyrometers were used to experimentally determine the temperature gradient. The weld pool boundaries on the surface plane of the work piece were determined by image processing of high speed videos, in order to evaluate the local solidification rates. Metallographic analysis of the weld seams proved that laser beam oscillation during welding can be used to reliably form an equiaxed dendritic grain structure, which reduces the susceptibility to the formation of hot cracks.

中文翻译：

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铝激光束焊接过程中通过光束振荡优化凝固条件

摘要 以重叠配置焊接铝 (AA6016) 板，以研究不同光束振荡模式对产生的温度梯度、局部凝固速率和产生的晶粒结构的影响，并将结果与​​传统直线焊接获得的结果进行比较。两个高温计用于通过实验确定温度梯度。通过高速视频图像处理确定工件表面平面上的熔池边界，以评估局部凝固率。焊缝金相分析证明，焊接过程中的激光束振荡可以可靠地形成等轴枝晶结构，从而降低热裂纹形成的敏感性。