J. Merry, B. Tweedy, National Institute of Aviation Research, Wichita State University, Wichita, KS; J. Takeshita, Lockheed Martin, New Orleans, LA; D. Burford, National Institute for Aviation Research, Wichita State University, Wichita, KS
In this presentation, the results of a recent study on the effect of pin tool design for friction stir welding thin sheets (0.040”) of aluminum alloys 2024 and 7075 are provided. The objective of this study was to investigate and document the effect of tool shoulder and pin diameter, as well as the presence of pin flutes, on the resultant microstructure and mechanical properties at both room temperature and cryogenic temperature. Specifically, the comparison between three tools will include:- FSW process load analysis (tool forces required to fabricate the welds)
- Static Mechanical Properties (ultimate tensile strength, yield strength, and elongation)
- Process window documenting the range of parameters that can be used with the three pin tools investigated
All samples were naturally aged for a period greater than 10 days. Prior research has shown 7075 may require post weld heat treatment. Therefore, an additional pair of room temperature and cryogenic temperature samples was post-weld aged to the 7075-T7 condition prior to mechanical testing.
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