Liu Jiaolong, Nai Xin, Ran Hao, Wang Pengcheng, Chen Haiyan, Meng Xianqi, Chen Xiaojun, Li Wenya, Chen Yuzeng
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127 Youyi Xilu, Xi'an 710072, China.
Ningbo Bode Hightech Co., Ltd., Ningbo 315000, China.
Materials (Basel). 2024 Oct 14;17(20):5017. doi: 10.3390/ma17205017.
As the demand for lightweight structures in the transportation industry continues to rise, AA5083 aluminum alloy has become increasingly prominent due to its superior corrosion resistance and weldability. To facilitate the production of high-quality, intricate AA5083 components, 5087 aluminum filler wire is commonly utilized in metal inert gas (MIG) welding processes for industrial applications. The optimization of filler wire composition is critical to enhancing the mechanical properties of AA5083 MIG-welded joints. This study investigates the effects of modifying 5087 aluminum filler wires with different titanium (Ti) contents on the microstructure and weldability of AA5083 alloy plates using MIG welding. The influence of Ti contents was systematically analyzed through comprehensive characterization techniques. The findings reveal that the constitutional supercooling induced by the Ti element and the formation of AlTi facilitate the heterogeneous nucleation of α(Al), thereby promoting grain refinement. When the Ti content of 5087 filler wire is 0.1 wt.%, the grain size of the weld center was 78.48 μm. This microstructural enhancement results in the improved ductility of the AA5083 MIG-welded joints, with a maximum elongation of 16.64% achieved at 0.1 wt.% Ti addition. The hardness of the joints was the lowest in the weld center zone. This study provides critical insights into the role of Ti content in MIG welding and contributes to the advancement of high-performance filler wire formulations.
随着运输行业对轻质结构的需求持续增长，AA5083铝合金因其优异的耐腐蚀性和可焊性而日益突出。为了便于生产高质量、复杂的AA5083部件，5087铝填充焊丝通常用于工业应用的金属惰性气体（MIG）焊接工艺中。填充焊丝成分的优化对于提高AA5083 MIG焊接接头的力学性能至关重要。本研究调查了用不同钛（Ti）含量改性5087铝填充焊丝对采用MIG焊接的AA5083合金板微观结构和可焊性的影响。通过综合表征技术系统地分析了Ti含量的影响。研究结果表明，Ti元素引起的成分过冷和AlTi的形成促进了α（Al）的非均匀形核，从而促进晶粒细化。当5087填充焊丝的Ti含量为0.1 wt.%时，焊缝中心的晶粒尺寸为78.48μm。这种微观结构的改善导致AA5083 MIG焊接接头的延展性提高，在添加0.1 wt.% Ti时最大伸长率达到16.64%。接头的硬度在焊缝中心区域最低。本研究为Ti含量在MIG焊接中的作用提供了关键见解，并有助于高性能填充焊丝配方的发展。
