Oxide fragments in friction stir welds: distribution and effects on crack initiation
- Jene T. ,
- Dobmann G. ,
- Wagner G. ,
- et al
- Jene T. ,
- Dobmann G. ,
- Wagner G. and
- Eifler D.
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Experimental investigations were undertaken to determine the way in which process parameters in friction stir welding (FSW) affect the distribution and quantity of embedded oxide particles in the weld zone and to elucidate the influence of such particles on fatigue crack initiation. Sheets (thickness 3.5 mm) of wrought Al alloy AA-5454 were joined by FSW on a milling machine equipped with a force measurement system. The process parameters varied were feed rate and rotational speed. Oxide particle distribution and its relationship with joint edge roughness were examined by microscopy. The effect of oxide fragments on crack initiation was studied in tensile tests. Ways of avoiding fragment conglomeration in the weld zone are discussed.
6th International Symposium, 10-13 Oct 2006, Session 3A: Fatigue I, Paper 01
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