Abstract The concept using an off-axis filler wire during laser welding is introduced here in order to provide added process robustness considering gap width variations. Its stability is investigated with respect to gap width, welding speeds and powers. Geometry of the welds is analysed by tracing of weld cap edges and joint cross sections, connecting trends to weld parameters. High speed imaging and streak images are used to further study and describe sequences of events, including undercut formation. Formation of imperfections are found to be mainly correlated to wire feed position variations at the surface due to irregular melting of the wire tip.

中文翻译：

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离轴送丝的激光焊接稳定性

摘要 这里介绍了在激光焊接过程中使用离轴填充焊丝的概念，以便在考虑间隙宽度变化的情况下提供额外的工艺鲁棒性。研究了其在间隙宽度、焊接速度和功率方面的稳定性。通过跟踪焊帽边缘和接头横截面，将趋势与焊接参数联系起来，分析焊缝的几何形状。高速成像和条纹图像用于进一步研究和描述事件序列，包括底切形成。发现缺陷的形成主要与由于焊丝尖端的不规则熔化而导致的表面处的焊丝进给位置变化有关。