Study of anisotropy impact of 2A12 and 7075 dissimilar aluminum alloys FSW joints

The influence of anisotropy on dissimilar aluminum alloy FSW joints were studied by changing the welding direction and advancing side materials. The results show the significant differences in both mechanical properties and microstructure of the welded joints. The 0 degrees 7AS joint has the highest tensile strength (414 MPa), reaching 87 % of the 2A12 aluminum alloys strength. The 0 degrees 7AS joint has the smallest average grain size in the weld nugget, and the best recovery and recrystallization ability. In the HAZ, the strongest texture types of the 0 degrees 7AS and 45 degrees 7AS joints are different. The 0 degrees 7AS joint has the highest texture strength, with a prominent {011} <211> brass texture. This paper provides the guidance for aluminum alloys welding.