Synchrotron X-ray video of full-penetration laser welding of aluminum AA1050A

The video shows a synchrotron x-ray video of full-penetration laser welding of the aluminum alloy AA1050A (Al99.5). At the beginning of the video the transition from partial penetration welding with a keyhole which is closed at its bottom to full-penetration welding with a keyhole which is opened at its bottom can be observed. The images show that the fluctuations of the capillary’s geometry during the beginning of the process result in an excessive formation of pores. During the further progress of the process a reliable full-penetration process is achieved with an increased stability of the geometry of the keyhole. A detailed analysis of this transition and its implications on the absorptance are presented in the related publication.

本视频展示了铝合金AA1050A（Al99.5）的全熔透激光焊接（full-penetration laser welding）同步辐射X射线视频（synchrotron x-ray video）。视频初始阶段，可观察到焊接模式从底部闭合匙孔（keyhole）的局部熔透焊接，向底部开口匙孔的全熔透焊接转变。图像显示，过程起始阶段匙孔几何形貌的波动会引发过量气孔生成。随着焊接过程持续推进，最终实现了稳定的全熔透焊接，匙孔几何形貌的稳定性显著提升。相关研究文献已对该转变过程及其对激光吸收率（absorptance）的影响展开了详细分析。