The investigation of typical welding defects for 5456 aluminum alloy friction stir welds

By Huabin Chen, Keng Yan, Tao Lin, Shanben Chen, Cheng Jiang, Y. Zhao. 2006

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Effect of welding speed on microstructure and mechanical properties of self-reacting friction stir welded 6061-T6 aluminum alloy (2013, background): “There have been a lot of efforts to understand the effect of process parameters on microstructure and mechanical properties of conventional FSW joints [9–13] and to analyze the microstructur al evolution [14–18], and only a few of investigations depicts the microstructur al characteristics and mecha”
A Review on Recent Progress in Solid State Friction Based Metal Additive Manufacturing: Friction Stir Additive Techniques (2018, background): “reasons for improper bonding due to oxide layer being present over interfacial region.(202) Additionally, inad-”
Investigations on tunneling and kissing bond defects in FSW joints for dissimilar aluminum alloys (2015, background): “The problem becomes more prominent if the tool pin does not penetrate the entire thickness of the BM plates [13].”
Investigations on the effects of friction stir welding parameters on intermetallic and defect formation in joining aluminum alloy to mild steel (2013, background): “8b, the increase in tool tilt angle results in a tunnel-free joint due to increase in weld heat input [31,32] and downward forging force [32], however the wide IMCs region forms in the weld nugget.”