中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 12 December 2025 |
（1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Shanghai Shipbuilding Technology Research Institute, China Shipping Group Company, Shanghai 200032, China）
Abstract:A novel Al-Mg-Er-Zr alloy was welded by highly efficient tandem GMAW, and the effect of Er on the porosity, microstructure and mechanical properties of the weld joints were investigated by comparing them with Al5083 alloy weld joints. The results showed that compared to the welds without Er addition, the porosity decreased from 0.78% to 0.38%, which was attributed to the ability of Er to reduce the content of free hydrogen in the welds. Furthermore, the grain size near the fusion boundary and weld metal (WM) was significantly refined with the addition of Er. Grain refinement near the fusion boundary was attributed to the heterogeneous nucleation induced by Al3(Er,Zr) from base metal, while grain refinement in WM was caused by the hindering effect of Al3Er on grain boundary migration. Additionally, the ultimate tensile strength of the weld joints increased from 272.44 to 338.74 MPa with Er addition. The precipitation strengthening induced by Al3Er contributed to an increase by 20% in strength.
Key words: Al-Mg-Er-Zr alloy; tandem GMAW; pore; microstructure; mechanical properties
