Research Progress in Double-sided Friction Stir Welding of Aluminum Alloy
With the development of applications of aluminum alloys in industrial manufacturing fields such as aerospace,rail transit and shipbuilding,achieving high-quality welding of aluminum alloys has become an urgent demand and research hotspot for the lightweight development of aluminum alloy components.As a solid-state welding technology,friction stir welding(FSW)has made significant progress in joining aluminum alloys.However,with the increasing demand for the application of large-thickness aluminum alloy plates,the single-sided FSW joints are prone to defects at the bottom of the weld due to insufficient heat supply,making it difficult to meet the quality requirements.In order to improve the defects of the above single-sided FSW joints,double-sided friction stir welding technology came into being.Based on the research results of two widely studied double-sided FSW processes,conventional double-sided friction stir welding(CDS-FSW)and bobbin tool friction stir welding(BT-FSW),the research progress of the two processes is reviewed and summarized,focusing on the optimization of welding process,microstructure,mechanical properties and influencing factors,tool design,welding temperature field and material flow behavior.Finally,the hotspots and research challenges of double-sided friction stir welding technology are summarized and prospected,in order to provide theoretical references for the development and practical engineering applications of double-sided friction stir welding technology.
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