Abstract

Tungsten Inert Gas (TIG) welding was used successfully to weld 5 mm thick aluminum alloy plates AA5052-H32 utilizing as and 0.25 wt % Sc added ER 5356 filler rod in this study. Furthermore, the effect of adding Sc to the filler rod on TIG welded joints with mechanical and metallurgical properties was investigated. An optical microscope (OM) and a scanning electron microscope (SEM) were used to examine the microstructures of the joints The Al-Sc precipitates are distributed uniformly throughout the fusion zone of scandium added weldment. The welded joint with scandium added filler rod has fewer porosities, resulting in enhanced joint efficiency. Commercial filler rod welded joints had a coarse microstructure, but Sc modified filler rod welded junctions had a fine dendritic structure. The welded joints’ tensile characteristics and hardness were investigated. Compared to commercial filler rods, the weld junction created with scandium enhanced filler rod has twice the ductility. SEM fractography revealed brittle fractures in weld samples with commercial filler rods and ductile fractures in weld samples with scandium-added filler rods. With the addition of Sc to the filler rod, no appreciable hardness difference was observed in the fusion zone. This study paper will aid companies and researchers to better understand the metallurgical and mechanical behaviour of TIG-welded AA5052-H32 plates using scandium added filler rod, reducing the number of experimental trials and allowing for further research.

中文翻译：

---

填充棒中添加钪对AA5052-H32合金钨极惰性气体焊接的影响

摘要

在本研究中，钨极惰性气体 (TIG) 焊接成功地用于焊接 5 mm 厚的铝合金板 AA5052-H32，使用 as 和 0.25 wt% Sc 添加 ER 5356 填充棒。此外，还研究了在填充棒中添加 Sc 对具有机械和冶金性能的 TIG 焊接接头的影响。使用光学显微镜（OM）和扫描电子显微镜（SEM）对接头的微观结构进行了检查。Al-Sc析出物均匀分布在添加钪焊件的整个熔合区。添加钪填充棒的焊接接头具有较少的孔隙率，从而提高了接头效率。商业填充棒焊接接头具有粗大的微观结构，但 Sc 改性填充棒焊接接头具有精细的树枝状结构。对焊接接头的拉伸特性和硬度进行了研究。与商业填充棒相比，使用钪增强填充棒产生的焊缝具有两倍的延展性。SEM 断口图显示使用商业填充棒的焊缝样品中存在脆性断裂，而使用添加钪填充棒的焊缝样品中存在韧性断裂。在填充棒中添加 Sc 后，在熔合区没有观察到明显的硬度差异。本研究论文将帮助公司和研究人员更好地了解使用添加钪填充棒的 TIG 焊接 AA5052-H32 板的冶金和机械行为，从而减少实验试验的数量并允许进一步研究。SEM 断口图显示使用商业填充棒的焊缝样品中存在脆性断裂，而使用添加钪填充棒的焊缝样品中存在韧性断裂。在填充棒中添加 Sc 后，在熔合区没有观察到明显的硬度差异。本研究论文将帮助公司和研究人员更好地了解使用添加钪填充棒的 TIG 焊接 AA5052-H32 板的冶金和机械行为，从而减少实验试验的数量并允许进一步研究。SEM 断口图显示使用商业填充棒的焊缝样品中存在脆性断裂，而使用添加钪填充棒的焊缝样品中存在韧性断裂。在填充棒中添加 Sc 后，在熔合区没有观察到明显的硬度差异。本研究论文将帮助公司和研究人员更好地了解使用添加钪填充棒的 TIG 焊接 AA5052-H32 板的冶金和机械行为，从而减少实验试验的数量并允许进一步研究。