Figure-eight shaped oscillation movement of laser was studied to improve the welding quality of 5-mm-thick 5083 aluminium alloy. The tests were conducted at 3 kW laser power for frequency levels ranging from 25 to 125 Hz and focal point positions as 0, −1 and −2 mm. The quality of welds was characterised by non-destructive testing methods including visual, liquid penetrant and radiographic inspections. In addition, mechanical properties were determined by tensile tests and microstructures were examined by digital video camera and optical microscope. The results showed that welds with lower penetration depth and less porous structure could be obtained at 125 Hz frequency independent of the focal point position when compared to the joints produced without beam oscillation.

中文翻译：

---

5083铝合金八字形振荡激光焊接行为表征

为提高5mm厚5083铝合金焊接质量，研究了激光的8字形振荡运动。测试在 3 kW 激光功率下进行，频率范围为 25 至 125 Hz，焦点位置为 0、-1 和 -2 mm。焊缝质量通过无损检测方法进行表征，包括目视、液体渗透和射线照相检查。此外，通过拉伸试验确定机械性能，并通过数码摄像机和光学显微镜检查微观结构。结果表明，与没有梁振荡产生的接头相比，在 125 Hz 频率下可以获得具有较低穿透深度和较少多孔结构的焊缝，而与焦点位置无关。