Localized melting-induced defects accompanied by abnormal plastic flow in bobbin-tool FSW of 5083 aluminum alloy
- Masaki K. ,
- Kojima K. ,
- Saito H. ,
- et al
- Masaki K. ,
- Kojima K. ,
- Saito H. and
- Nezaki K.
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In this study, the improvement of process stability of bobbin tool FSW for long welding length was studied. The base material used in this study was 18mm thickness 5083-O Al alloy. Floating bobbin type tools were used in this study. FSW produced defect-free weld in short welding length. In the weld longer than 2 m with same welding condition as the short length welding, volumetric defects were found in the stir zone with abnormal macrostructure in the horizontal cross section of the weld. The defects decreased by increasing air cooling around the welding tool. The thermal hysteresis of the tool during FSW was directly measured by a thermocouple embedded in the prove center. It was found that the maximum temperature in stir zone might reach to the solidus temperature of the 5083 Al alloy. It was suggested that excessive local melting in stir zone occurred during long length welding, and caused the defects in stir zone under insufficient cooling
condition.
13th International Symposium, 21-23 May 2024, Session 10: Techniques III, Paper 03
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