SU Hao, LI Xue, ZHAO Qingzhen, et al.Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding[J].Electric Welding Machine, 2023, 53(3): 91-100.
SU Hao, LI Xue, ZHAO Qingzhen, et al.Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding[J].Electric Welding Machine, 2023, 53(3): 91-100. DOI: 10.7512/j.issn.1001-2303.2023.03.11.
Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding
Dissimilar alloys of 6061 aluminum and T2 copper with thickness of 2 mm were butt joined by utilizing friction stir welding (FSW) to investigate the effect of pin offset values on microstructure and mechanical property of the Al/Cu joints. It was found that the temperature at the tool-workpiece interface was kept relatively stable, but the transverse force was increased gradually, and the material interlocking of dissimilar Al/Cu was also enhanced with the pin offsetting from Al side to Cu side, which was because of the dissimilar material flow characteristics between Al and Cu. The Scanning Electron Microscopy (SEM) analysis were performed on the microstructure of dissimilar Al/Cu FSW joints, it was demonstrated that the Intermetallic Compounds (IMCs) at the Al/Cu joining interface were distinct two-layers structure, which was Al,2,Cu layer at Al side and the Al,4,Cu,9, layer at Cu side, and the IMCs were also distributed with various structures with both granular and banded shapes near the Al/Cu interface. The optimal material interlocking and IMCs distribution of Al/Cu FSW joint were achieved with pin offsetting 0.5 mm to Cu side, and the maximum Al/Cu joint tensile strength was 200 MPa.
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