Modeling the Effects of Tool Geometries on the Temperature Distributions and Material Flow of Friction Stir Aluminum Welds

Mohanty, H. K.; Mahapatra, Manas Mohan; Kumar, Pradeep; Jha, Pradeep Kumar

doi:10.1002/9781118364697.ch3

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…From a microstructure viewpoint, two sides surround the joint line. An advancing side (AS) where flow of materials generally undergoes higher temperature rises, and the retreating side (RS) on the opposite side, where material flow undergoes lower temperatures [10]. The combined different temperature rises between the two adjacent sides of the joining line and the friction stirring generated by the probe, at temperatures below the material melting point (T M ), induce a microstructural asymmetry between the AS and RS.…”

Section: Fsw Process Peculiaritiesmentioning

confidence: 99%

“…From a technological viewpoint, FSW requires a shoulder which is protruded with a pin, also called the probe. The shoulder arrangement creates the frictional heating, and a pin probe is chiefly responsible for the generation of the material stirring throughout the joint interface volume [10]. From a microstructure viewpoint, two sides surround the joint line.…”

Section: Introductionmentioning

confidence: 99%

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New Approaches to Friction Stir Welding of Aluminum Light-Alloys

Cabibbo

Forcellese

Santecchia

et al. 2020

Metals

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Friction stir welding (FSW) is the most widely used solid-state joining technique for light-weight plate and sheet products. This new joining technique is considered an energy-saving, environment friendly, and relatively versatile technology. FSW has been found to be a reliable joining technique in high-demand technology fields, such as high-strength aerospace aluminum and titanium alloys, and for other metallic alloys that are hard to weld by conventional fusion welding. Several studies accounted for the microstructural modifications induced by solid-state FSW, based on the resulting mechanical properties obtained at the FSW joints, such as tensile, bending, torsion, ductility and fatigue responses. In the last few years with the need and emerging urgency to widen the FSW application fields, broadening the possible alloy systems, and to optimize the resulting mechanical properties, this joining technique was further developed. In this respect, the present contribution focuses on two modified-FSW techniques and approaches applied to aluminum alloys plates. In a first case, an age-hardening AA6082 sheets were double side friction stir welded (DS-FSW). In a second case a non-age-hardening AA5754 sheet was FSW by an innovative approach in which welding pin was forced to slightly deviate away from the joining centreline (defined by authors as RT). In both the cases different pin heights were used, the sheets were subjected to heat treatments (peak hardening T6 for the AA6082, and annealing for the AA5754) and compared to the non-heat treated FSW conditions. Microstructural modifications were characterized by optical microscopy (OM). The mechanical properties were characterized both locally, by nanoindentation techniques, and globally, by tensile (yield, YT; ultimate, UT; and elongation, El) or forming limit curve (FLC) tests. Both the new approaches were directly compared to the conventional FSW techniques in terms of resulting microstructures and mechanical responses.

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Section: Fsw Process Peculiaritiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Approaches to Friction Stir Welding of Aluminum Light-Alloys

Cabibbo

Forcellese

Santecchia

et al. 2020

Metals

View full text Add to dashboard Cite

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Section: Model Descriptionmentioning

confidence: 99%

“…Owing to the existence of a high strain rate in the stirring zone around the tool pin and low strain rate outside the stirring zone, a Carreou viscosity model was introduced in the present investigation, as done by Atharifar et al to take care of non-linear viscosity behavior of weld material in computational zone. 14,17 The viscosity and velocity gradient can be determined from the solution of the momentum conservation equation (2). Temperature dependent martial properties like specific heat (C p ) and thermal conductivity of the material (K) were included in the energy equation (3).…”

Section: Governing Equationsmentioning

confidence: 99%

Study on the effect of tool profiles on temperature distribution and material flow characteristics in friction stir welding

Mohanty

Mahapatra

Kumar

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part B:

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The present investigation describes a computational fluid dynamics approach to study the effects of friction stir welding tool profiles on the thermal conditions and material flow in welds. The aim is to observe the temperatures of the weld and material flow with respect to different probe profiles. For the modeling purpose, temperature dependent material properties and stick-slip conditions between the tool and work material were incorporated. The results from the model exhibited most of the process characteristics of friction stir welding, such as the difference in temperatures of advancing and retreating sides of the weld, temperature contours ahead and behind the tools along the weld, and flow fields. The thermal condition exhibited temperatures that were close to experimental values and below the melting point of the aluminum alloy.

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Modeling the Effects of Tool Geometries on the Temperature Distributions and Material Flow of Friction Stir Aluminum Welds

Cited by 2 publications

References 11 publications

New Approaches to Friction Stir Welding of Aluminum Light-Alloys

New Approaches to Friction Stir Welding of Aluminum Light-Alloys

Study on the effect of tool profiles on temperature distribution and material flow characteristics in friction stir welding

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