Influence of side-tilt angle on process forces and lap joint strength in robotic friction stir welding
- de Backer J. ,
- Cederqvist L. and
- Soron M.
- de Backer J. ,
- Cederqvist L. and
- Soron M.
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Lap joints were fabricated in AA 7075-T6 aluminium alloy sheets (thickness 2 mm) using an ESAB "Rosio" friction stir welding (FSW) robot and the effect tool of side-tilt angle on welded joint tensile strength was investigated. A "CounterStir" FSW tool with both clockwise and anticlockwise threads on the pin was employed to create upwards and downwards material flow to minimise interface stress and reduce the hooking effect. Welding was performed at a rotational speed of 1200 rpm and a travel speed of 8 mm/s. Side-tilt angle was varied between -3.2 degrees (into the retreating side) and +4 degrees (into the advancing side). Welded joints were characterised by microstructure observations and tensile tests performed on specimens with advancing side under tension, retreating side under tension or bottom side under tension.
9th International Symposium, 15-17 May 2012, Session 9A: Process II, Paper 01
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