Microstructure and mechanical properties of aluminum-steel dissimilar metal welded using arc and friction stir hybrid welding

In this study, arc and friction stir hybrid welding (AFSHW) was proposed to weld aluminum-steel dissimilar metals in attempt realize high quality joining. Firstly, an interlayer produced on galvanized steel by using bypass current-metal inert gas (BC-MIG), then aluminium plate jointed via Friction lap (FSLW). The effects of tool pin length FSLW times the microstructure mechanical properties joints were fully investigated means Optical Microscopy (OM), Scanning Electron Microscope (SEM), Backscatter Diffraction (EBSD), testing. results show that as increased, joint strength tended increase decrease, tensile failure partially occurred at base metal. However, with additional number FSLW, would be reduced, which attributed attenuated dislocation density strain concertation joint. research outcomes will provide a new method obtain sound Al-Fe metal joint, benefit better understanding joining mechanism.