Influence of different welding materials on weldability and weld bead microstructure of 7075 aluminum alloy
LIU Zheng-jun
HE Si-zhuo
SU Yun-hai
ZHANG Kun
Abstract：In order to improve the weldability of 7075 aluminum alloy and enhance the mechanical properties of welded joint,the 7075 aluminum alloy was welded with ER4043 and ER5356 welding wires. In addition,the mechanical properties of welded joint were tested with both universal tensile testing machine and small Vickers hardness tester,and the microstructure of welded joint was characterized with the optical microscope(OM), scanning electron microscope(SEM), energy dispersive spectrometer(EDS) and X ray diffractometer(XRD). The results show that the mechanical properties of welded joint obtained with ER5356 welding wire is higher than those of welded joint obtained with ER4043 welding wire. Compared with the weld bead with adopting ER4043 welding wire,the grain in the weld bead with adopting ER5356 welding wire is finer, and the distribution of precipitates is more uniform. The Mg element in ER5356 welding wire is beneficial to enhancing the strength of welded joint, while the Si element in ER4043 welding wire is beneficial to improving the weldability of 7075 aluminum alloy.
Keywords：aluminum alloywelding wireweldabilitywelded jointmechanical propertymicrostructuregrainprecipitate
Publication Date：2018-03-02
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 139-144 )