Abstract
This paper carried out the friction plug repair welding of 6082 aluminum alloy keyhole defects by using the method of friction heating between shaft shoulder and base material. In addition, a well-formed friction plug welding joint was obtained at different plug rotation speeds. In order to study the influence mechanism of plug rotation speeds on the microstructure of the weld nugget zone, EBSD technology was used to analyze the grain morphology, grain size and grain boundary characteristics of the weld nugget zone under different rotation speeds of the plug rod. The results show that in the nugget zone, the grain was fine and equated crystals refinement, and there was a preferred orientation. The deformation texture components in the welded nugget zone increased with the plug rotation speed from 1600 to 2000 rpm. However, the grain size first decreased and then increased, while the components in the High-Angle Boundary first increased and then decreased.
Highlights
Friction stir welding (FSW) does not require filler material during the welding process
FSW is recognized as an ideal welding method for aluminum alloy [2], which is widely used in aerospace, rail transportation and other fields [3]
Based on the plastic flow characteristics of materials in the FSW process, the joint can be divided into four zones: weld nugget zone (NZ), thermo-mechanical affected zone (TMAZ), heat affected zone (HAZ) and base metal zone (BM) [4]
Summary
Friction stir welding (FSW) does not require filler material during the welding process. Hofmann [7] conducted underwater multi-channel friction stir machining of 6061 aluminum alloy, and the results showed that the grain size in the weld nugget zone was related to the ambient temperature.
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