Friction stir welding of Al-Mg-Sc alloy thick plates and thick-walled pipes
- Lopota V.A. ,
- Strekalov A.F. ,
- Makhin I.D. ,
- et al
- Lopota V.A. ,
- Strekalov A.F. ,
- Makhin I.D. ,
- Velichko O.V. ,
- Karkhin V.A. ,
- Ivanov S.Y. ,
- Nor K. and
- Iqbal N.
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With regard to the development of Al-Mg-Sc alloys for aerospace applications, an investigation is presented into friction stir welding (FSW) of thick plates (thickness 35 mm) and thick-walled pipes made from 1570C alloy (Al, 5.7%Mg, 0.29%Mn, 0.2%Sc, 0.12%Zr) and the feasibility of different exit hole management techniques. FSW experiments were conducted using a gantry-type "PowerStir" machine capable of withstanding axial forces up to 150 kN without structural deflection. The tool probe was manufactured from a high strength MP159 Ni-Co alloy and the tool shoulder from H13 tool steel. Friction taper plug welding trials were undertaken to study the influence of process parameters such as welding force, burn-off distance and rotational speed on joint quality. Microstructures in the HAZ and thermomechanically affected zone were observed by optical microscopy and energy dispersive X-ray analysis. Fracture surfaces were examined by SEM. Mechanical properties were characterised by Vickers hardness measurements and tensile tests.
10th International Symposium, 20-22 May 2014, Session 3A: Applications, Paper 02
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