Metals · 2020 · 24 citations · 37 references
EngineeringAerospace EngineeringMaterials EngineeringAerospace MaterialsAerospace StructuresAircraft StructuresAlloysFriction Stir WeldingMetalsRepair Of Aerospace StructuresWeldingWelding ProcessesAluminium AlloysAluminum Alloy WeldingAluminum AlloysFriction Stir Welding ProcessProcess ParametersProcess Parameters OptimizationWeld DefectsWelded Joints
The restoration of numerous aircraft structures is achievable with effective repair of welded joints. T-joints are often utilized in these structures to provide structural stability, keeping minimal body weight. Multi-pass friction stir welding (FSW) has proved to be useful for improving the quality of aluminium alloy welds employed in the aerospace sector. However, FSW of these alloys in T-configuration has not been sufficiently addressed yet. Even rarer is the discussion of efficacy of second FSW pass, with altered process parameters for improving the weld quality in T-joints. Hence, two commonly used aerospace grade aluminium alloys, namely, AA2024 and AA7075, were friction stir welded in T-configuration, varying three process parameters, i.e., tool rotational speed, welding speed and shoulder diameter. The effect of second FSW pass, performed at an optimum set of parameters, on kissing bond and tunnelling defect was studied in detail. A substantial reduction in the detrimental effect of these weld defects was discussed via tensile testing, micro-hardness and micro-structural observations.
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Z.Y. Ma, Aihan Feng, D. L. Chen et al. · Critical reviews in solid state and materials sciences/CRC critical reviews in solid state and materials sciences · 2017 · 384 citations