Assessment of the static and dynamic mechanical properties of DP800 friction stir spot welds produced via a robotic system
- Kyffin W.J. ,
- Ohashi R. ,
- Fujimoto M. ,
- et al
- Kyffin W.J. ,
- Ohashi R. ,
- Fujimoto M. and
- Koga S.
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The microstructure, static and dynamic fatigue failure properties of friction stir spot welds in advanced high-strength steel were investigated. Welds were made in the overlap configuration in uncoated and galvanised dual-phase DP800 steel (1.25 mm and 2 mm thickness for body and chassis, respectively) using a constant Z-axis load robotic system. Silicon nitride based tools, with proprietary coatings aimed at extending tool lifetime, were used for spot welding. Cycles times were in the range 1-2.6 s. The fatigue results were compared with those for resistance spot welds. The two distinct fatigue failure modes observed are discussed in terms of the local stress range.
8th International Symposium, 18-20 May 2010, Session 7A: Automotive Spot 1, Paper 04
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