Characterization of the influences of FSW tool geometry on welding forces and weld tensile strength using an instrumented tool

Hattingh, D.G.; Blignault, C.; Niekerk, T.I. van; James, M.N.

doi:10.1016/j.jmatprotec.2007.10.028

Cited by 146 publications

(73 citation statements)

References 5 publications

(7 reference statements)

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“…This is an unexpected result. It was reported that the thread geometry [38], thread orientation [22] and thread pitch size [37] were important in metal FSSW operations. The effect of the lap-shear tensile fracture load and the tool pin angle on welding zone are shown in Figure 7 and Figure 6.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

Bilici

2012

Express Polym. Lett.

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“…The process signatures created by varying the FSW/P variables can bring out the working mechanism of FSW/P. Hattingh 17 , et al analysed the force footprints to systematically study the influence of tool geometry on FSW process parameters and on weld tensile strength, in an effort to optimize the tool design thereby producing welds with 97 per cent of the parent metal strength in Al 5083-H321 alloy. Studies on the relationship between tool profiles, rotational speeds, traverse speed and the microstructure using force footprint plots were reported by Hattingh 18 , et al Arbegast…”

Section: Introductionmentioning

confidence: 99%

Role of Threaded Tool Pin Profile and Rotational Speed on Generation of Defect Free Friction Stir AA 2014 Aluminium Alloy Welds

Reddy¹,

Rao²

2016

DSJ

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Influence of threads on tool pin and rotational speeds on defect occurrence in friction stir welding (FSW) of aluminum alloy AA 2014 T6 plates has been studied. The effect of FSW forces on the evolution of mechanistic defects, caused in turn through a variation in heat generation during the process has also been examined. In case of conical tool pin, relatively lower rotational speeds resulted in unbounded zones and micro defects while high speeds caused excessive flash, thereby resulting in surface defects and voids inside the weld. The FSW joints were defect-free at moderate speeds, hinting an optimum heat generation and flow. Reaction forces on the tool pin, in the welding direction, were correlated with the defect formation. Tools equipped with a threaded conical pin profile resulted in sound welds, irrespective of the tool rotational speeds in the entire range of 400 rpm -2400 rpm. The threaded conical pin, with a relatively larger frictional area, may be contributing to higher levels of heat generation compared to a plain conical pin. Further, positive displacement of the hot plasticised material by the threads will carry away excess heat from the advancing-to-the-retracting side and simultaneously downwards, thus confining all heat within the weld zone.

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“…The quality of the friction stir welded joint was found to be greatly influenced by the process parameters adopted during the welding process [4]. It is observed that limited investigations have been carried out, taking into consideration the impact of the tool geometry during FSW of high strength alloys [5][6][7][8][9][10][11][12]. For example, Blignault et al [8] made an experimental investigation to understand & characterize the influences of FSW tool geometry on the weld tensile strength and welding force using completely different instrumented tool geometries.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It is observed that limited investigations have been carried out, taking into consideration the impact of the tool geometry during FSW of high strength alloys [5][6][7][8][9][10][11][12]. For example, Blignault et al [8] made an experimental investigation to understand & characterize the influences of FSW tool geometry on the weld tensile strength and welding force using completely different instrumented tool geometries. He was able to experimentally and analytically exhibit that the use of a tool geometry having a trifluted tapered pin was able to fabricate sound quality joints with improved mechanical properties.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation on Evolution of Microstructures and Characterization During FSW of Az80a Mg Alloy

Sevvel

Jaiganesh

2017

Archives of Metallurgy and Materials

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Experimental investigation was conducted to find out microstructural characteristic changes arising in the weldments AZ80A Mg alloys obtained using the friction stir welding. Tools with three different pin profile geometries were employed during this investigation at constant tool rotational speed and feed rate. Tensile tests are performed and the tensile fracture surfaces are examined using the Scanning Electron Microscope (SEM) and the obtained SEM images are used for microstructural investigations. From the experimental results, it was observed that the geometry of the tool pin plays a significant role in producing essential stirring action there by regulating the flow of the plasticized material and leading to the formation of small sized grains having equally distributed fine strengthening precipitates. These structured grains have a direct reflecting impact in increasing the hardness and mechanical properties of the fabricated joints at the nugget zone of the friction stir welded AZ80A Mg alloy joints.

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Characterization of the influences of FSW tool geometry on welding forces and weld tensile strength using an instrumented tool

Cited by 146 publications

References 5 publications

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

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

Role of Threaded Tool Pin Profile and Rotational Speed on Generation of Defect Free Friction Stir AA 2014 Aluminium Alloy Welds

Investigation on Evolution of Microstructures and Characterization During FSW of Az80a Mg Alloy

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