Analysis of tensile-shear strength of single and multi-friction stir spot welding joints under fixed welding process conditions

Asadollahi, Morteza; Jabbari, Neda; Nakhodchi, Soheil; Salimi, Hossein; Khodaparast, Hamed Haddad

doi:10.1177/0954406220931527

Cited by 2 publications

(2 citation statements)

References 32 publications

(46 reference statements)

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“…Therefore, the swirly region may have a significant contribution to the strength of the welds created by the CP-FSSW method which is discussed later. 52 It should be mentioned that fracture surfaces of the samples after cross-tension tests were relatively similar to those after tensile-shear tests including the regions with and without dimples related to areas with and without bonding, respectively, at the interface of consumable pin and bottom of pre-created hole.…”

Section: Resultsmentioning

confidence: 69%

Consumable pin-friction stir spot welding of Al-Mg-Si alloy via pre-created hole and refilling: Microstructure evolution, defects, and shear/tensile failure load

Baghdadchi

Movahedi

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Since Al-Mg-Si alloys are widely used in the transportation industry, it is important to produce a sound and robust weld between the sheets of these alloys. The focus of this work is on the tensile-shear and cross-tension strengths of the consumable pin-friction stir spot welds (CP-FSSWs) without an exit-hole between the Al-6061 aluminum sheets. Before welding, a hole was created at the joint region in the base sheets and then, it was filled using a rotating consumable pin. The tensile-shear, cross-tension, and microhardness tests were employed to evaluate the mechanical properties of the spot welds. The results showed that the pre-created hole was entirely filled during the welding process. While a complete bond was formed between the consumable pin and the lateral surface of the hole, there were three distinct regions at the interface of the pin and the bottom of the hole: complete bond, kissing bond, and defects. Enhancement of the tool rotational speed decreased the area of the complete bond in the weld compared to the other regions. A linear relationship existed between the bonding area and weld failure load in the cross-tension test. The proposed relationship approved the impact of the swirly region at the interface of the base sheets on the weld strength. While in the cross-tension test, the weld failure load decreased from ∼2800 to ∼1950 N, it improved from ∼10,500 to ∼12,000 N in the tensile-shear test with enhancement of the tool rotational speed from 700 to 2000 rpm. The hardness measurements demonstrated that there was no common heat affected zone softening after CP-FSSW.

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Section: Resultsmentioning

confidence: 69%

Consumable pin-friction stir spot welding of Al-Mg-Si alloy via pre-created hole and refilling: Microstructure evolution, defects, and shear/tensile failure load

Baghdadchi

Movahedi

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Furthermore, the influence of plunge depth and dwell time parameters on joint quality and strength as well as the feasibility of multiple spot welding were studied. Although not often referred to in the literature, multiple-spot welding has more industrial applications than single-spot welding [25]. Finally, the pinless tool used in most of the welding tests was compared to a more conventional tool, which is composed of a conical pin and a concave shoulder.…”

Section: Introductionmentioning

confidence: 99%

Friction Stir Spot Welding of Thin Aluminium Sheets to Polyamide 6: A Study of the Welding Parameters and Strategies

Pereira,

Galvão,

Costa

et al. 2024

J. Compos. Sci.

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The joining of aluminium alloy AA6082-T6 to polyamide 6 (PA6) by friction stir spot welding (FSSW) was investigated in the current work. Although previous studies can be found on the joining of polymers and metals by FSSW, welding using aluminium plates as thin as the ones used in this work (1 mm) was not found. The influence of the plunge depth (0.1 to 0.5 mm) and the dwell time (15 and 30 s) parameters on the welding results was studied. In general, the increase of these parameters led to the improvement of the maximum load of the joints under tensile-shear testing. Additionally, the feasibility of multiple spot welding was tested and proven. Finally, although most of the welds were performed with a pinless tool, a tool with a conical pin and a concave shoulder was used for comparison. The use of this more conventional tool resulted in joints easily broken by handling. Still, the potential of the conical pin tool was demonstrated. The different conditions were evaluated based on morphology and tensile-shear testing. The weld with the best mechanical behaviour was produced with multiple spot welding, which failed for a maximum load of about 2350 N.

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Analysis of tensile-shear strength of single and multi-friction stir spot welding joints under fixed welding process conditions

Cited by 2 publications

References 32 publications

Consumable pin-friction stir spot welding of Al-Mg-Si alloy via pre-created hole and refilling: Microstructure evolution, defects, and shear/tensile failure load

Consumable pin-friction stir spot welding of Al-Mg-Si alloy via pre-created hole and refilling: Microstructure evolution, defects, and shear/tensile failure load

Friction Stir Spot Welding of Thin Aluminium Sheets to Polyamide 6: A Study of the Welding Parameters and Strategies

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