This paper presents a new approach in laser welding of Al-5052 and heat Al-6061 aluminum alloys, which are challenging materials for a good laser welding quality. The process consists of applying very small size of 0.1 mm to provide a high density of power that aims at imposing a high amount of heat that is required for aluminum alloys; simultaneously the wobbling technique is implemented to reduce the risk of overheating in the welding area. Having relied on the capability of the wobbling technique to distribute the generated heat, welding results contained negligible thermal defects compared to the usual defects such as underfill, undercut, and root reinforcement. The resulted welding zones show a fully penetrated welding quality for both alloys with a smooth weld seam at the top and root surface. Analysis indicates a higher tensile strength of 190 MPa for Al-5052 corresponding to an 18% decrease from the base metal, while this reduction of mechanical strength in the welded zone for Al-6061 was about 27%. Also, the hardness profile of Al-5052 reveals a small reduction in the fusion zone in contrast to Al-6061, for which a high hardness decrease happens in the welded zone. This approach is more profitable for the cost-effectiveness of the process since the laser power is set at a low range as the high-power density is mainly related to the small size of the spot diameter.

中文翻译：

---

在两种铝合金的高功率密度激光焊接中通过摆动技术提高焊接性：Al-5052 和 Al-6061

本文介绍了 Al-5052 和热 Al-6061 铝合金激光焊接的新方法，这些铝合金是具有良好激光焊接质量的挑战性材料。该工艺包括应用 0.1 毫米的非常小的尺寸来提供高密度的功率，旨在施加铝合金所需的大量热量；同时采用摆动技术以降低焊接区域过热的风险。依靠摆动技术分配产生的热量的能力，焊接结果包含的热缺陷与常见的缺陷（如底部填充、咬边和根部加固）相比可以忽略不计。结果焊接区显示出两种合金的完全熔透焊接质量，在顶部和根部表面具有光滑的焊缝。分析表明，Al-5052 的拉伸强度较高，为 190 MPa，对应于母材降低 18%，而 Al-6061 焊接区的机械强度降低约 27%。此外，与 Al-6061 相比，Al-5052 的硬度分布显示熔合区有少量减少，Al-6061 的硬度降低发生在焊接区。这种方法对于工艺的成本效益更有利，因为激光功率设置在较低的范围内，因为高功率密度主要与光斑直径的小尺寸有关。其在焊接区发生高硬度下降。这种方法对于工艺的成本效益更有利，因为激光功率设置在较低的范围内，因为高功率密度主要与光斑直径的小尺寸有关。其在焊接区发生高硬度下降。这种方法对于工艺的成本效益更有利，因为激光功率设置在较低的范围内，因为高功率密度主要与光斑直径的小尺寸有关。