Effect of tool geometry on hook formation and static strength of friction stir spot welded aluminum 5754-O sheets

Badarinarayan, H.; Shi, Yandong; Li, X.; Okamoto, K.

doi:10.1016/j.ijmachtools.2009.06.001

Cited by 241 publications

(122 citation statements)

References 5 publications

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“…This can be the basis to conclude that there is better material when a tool with concave profile is used. This agrees well with the experimental results (18) . Therefore the tool with the concave shoulder is preferred for friction stir spot welding.…”

Section: Effect Of Tool Geometry On Mixing Of Materialssupporting

confidence: 93%

“…However, in practical applications, tools oftentimes have a profile on the shoulder such as concave or convex. A prior study shows that welds made with concave tool yielded higher spot strength that those made with flat or convex tools (18) . Hence, it is necessary to evaluate the effect of tool shoulder profile on material flow.…”

Section: Effect Of Tool Geometry On Mixing Of Materialsmentioning

confidence: 96%

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Analysis of Temperature and Plastic Flow during Friction Stir Spot Welding Using Particle Method

Hirasawa

Badarinarayan

Okamoto

et al. 2009

JTST

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Friction stir spot welding (FSSW) is a new metal-joining process, and a numerical simulation code to calculate optimal welding conditions is desired. In this paper, we analyzed temperature distribution and plastic deformation flow during the FSSW process with the fluid flow model and the elastic-plastic deformation model using the particle method. Spot welds are made with a cylindrical pin tool having flat shoulder with a fixed tool rotational speed. Simulation results predict an axisymmetric temperature distribution with the temperature below the tool in the region of 300 °C. The material flow predicted by the elastic-plastic deformation model is similar to experimental results. The model predicts the material flow at the pin periphery is in the upward direction. Near the shoulder, there are two flow patterns observed -beneath the shoulder, the material is pushed downward due to the force acting from the shoulder face, whereas on the shoulder periphery the material flows upward and outward due to extrusion of the material that is caused by the shoulder plunge. This extruded material shows up on the specimen surface as burr.

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Section: Effect Of Tool Geometry On Mixing Of Materialssupporting

confidence: 93%

Section: Effect Of Tool Geometry On Mixing Of Materialsmentioning

confidence: 96%

Analysis of Temperature and Plastic Flow during Friction Stir Spot Welding Using Particle Method

Hirasawa

Badarinarayan

Okamoto

et al. 2009

JTST

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show abstract

“…On the basis of the obtained results, the hook geometry could be considered as a criterion to describe the failure mechanism in friction stir lap welded joints. 8 The hook defect, which exists between overlapped sheets, is a weak metallurgical bond and can act as a crack as it has already proposed by other authors [16][17][18]. Initially, at low levels of external loads, the crack can propagate along the hook in the two sides of the weld.…”

Section: Effect Of the Pin Geometry On Mechanical Propertiesmentioning

confidence: 93%

“…It is clear that, the tool shape significantly affects the hook geometry, which in turn impacts the failure mode and therefore the failure load of friction stir lap welds. Hence, in order to optimize the FSW process of lap welds, it is necessary to develop a better understanding of the formation of the hook defect and the impact of tool geometry on its generation and elimination [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Influence of tool geometry and rotational speed on mechanical properties and defect formation in friction stir lap welded 5456 aluminum alloy sheets

et al. 2014

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Friction stir welding of AA5456 aluminum alloy in lap joint configuration is with two different tempers, T321 and O, and different thicknesses, 5mm and 2.5mm was investigated. The influences of tool geometry and various rotational speeds on macrostructure, microstructure and joint strength are presented. Specifically, four different tool pin profiles (a conical thread pin, a cylindrical-conical thread pin, a stepped conical thread pin and Flared Triflute pin tool) and two rotational speeds, 600 and 800 rpm, were used. The results indicated that, tool geometry influences significantly material flow in the nugget zone and accordingly control the weld mechanical properties. Of particular interest is the stepped conical threaded pin, which is introduced for the first time in the present investigation. Scanning electron microscopy investigation of the fracture location of samples was carried out and the findings correlated with tool geometry features and their influences on material flow and tension test results. The optimum microstructure and mechanical properties were obtained for the joints produced with the stepped conical thread pin profile and rotational speed of 600 rpm. The characteristics of the nugget zone microstructure, hooking height, and fracture location of the weld joints were used as criteria to quantify the influence of processing conditions on joint performance and integrity. The results are interpreted in the framework of physical metallurgy properties and compared with published literature.

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“…These gerometircal characteristics determine the strength of a FSSW joint [18,19]. There are numerous papers concerning the FSSW parameters which affect the joint geometry and the weld strength [16,29,30]. The quality of a spot weld is usually determined by a lap-shear test [31].…”

Section: K Bilicimentioning

confidence: 99%

Effect of tool geometry on friction stir spot welding of polypropylene sheets

Bilici

2012

Express Polym. Lett.

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Abstract. The effects of tool geometry and properties on friction stir spot welding properties of polypropylene sheets were studied. Four different tool pin geometries, with varying pin angles, pin lengths, shoulder diameters and shoulder angles were used for friction stir spot welding. All the welding operations were done at the room temperature. Lap-shear tensile tests were carried out to find the weld static strength. Weld cross section appearance observations were also done. From the experiments the effect of tool geometry on friction stir spot weld formation and weld strength were determined. The optimum tool geometry for 4 mm thick polypropylene sheets were determined. The tapered cylindrical pin gave the biggest and the straight cylindrical pin gave the lowest lap-shear fracture load.

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Effect of tool geometry on hook formation and static strength of friction stir spot welded aluminum 5754-O sheets

Cited by 241 publications

References 5 publications

Analysis of Temperature and Plastic Flow during Friction Stir Spot Welding Using Particle Method

Analysis of Temperature and Plastic Flow during Friction Stir Spot Welding Using Particle Method

Influence of tool geometry and rotational speed on mechanical properties and defect formation in friction stir lap welded 5456 aluminum alloy sheets

Effect of tool geometry on friction stir spot welding of polypropylene sheets

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