Dissimilar friction stir lap welding of AA 6082 - Mg AZ31: Force analysis and microstructure evolution

Boccarusso, Luca; Astarita, Antonello; Carlone, Pierpaolo; Scherillo, Fabio; Rubino, Felice; Squillace, Antonino

doi:10.1016/j.jmapro.2019.06.022

Cited by 41 publications

(21 citation statements)

References 49 publications

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“…Boccarusso et al have reported that the downward force is reduced with an increase in the RPM for a given traverse speed. [39] It seems this effect was more prominent for the 4.25 mm pin which could be the reason for tunneling defect formation. The formation of tunneling defect was confirmed in repeated experiments.…”

Section: B Microstructural Examination Of Weld Cross-sectionmentioning

confidence: 94%

Effect of Pin Length and Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welded Lap Joints of AZ31B-H24 Mg Alloy and AA6061-T6 Al Alloy

Bandi

Bakshi

2020

Metall Mater Trans A

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In the present work, friction stir welding of 3-mm-thick AA6061-T6 Al alloy and AZ31B-H24 Mg alloy sheets was carried out in lap configuration with Al alloy on top. Experiments were carried out by varying the pin length (3.25, 3.75, and 4.25 mm) and tool rotation speed (600, 800, and 1000 RPM). Microstructures of the joint cross-section revealed the presence of a compound intermetallic layer along the interface consisting of Al-rich (Al 3 Mg 2) intermetallic compound near the Al alloy side, and Mg-rich intermetallic compound (Mg 17 Al 12) near the Mg alloy side. The formation of a eutectic mixture of Mg solid solution and Mg 17 Al 12 was observed at the hook on either side. Two modes of failure were observed; Mode 1 through the interface and Mode 2 due to failure of the sheet. The Mode 1 failure strengths obtained were the highest (148 ± 6 N/mm) compared to the literature and were obtained for the 3.25 and 3.75 mm pin at 800 RPM. A lap shear strength of 212 ± 6 N/mm was obtained with 4.25 mm pin length at 600 RPM, which is the highest reported so far and was attributed to Mode 2 failure. The effect of interface pull-up, angle of the interface at the advancing side, and distribution of intermetallic compounds on the lap-shear strength are discussed.

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Section: B Microstructural Examination Of Weld Cross-sectionmentioning

confidence: 94%

Effect of Pin Length and Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welded Lap Joints of AZ31B-H24 Mg Alloy and AA6061-T6 Al Alloy

Bandi

Bakshi

2020

Metall Mater Trans A

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“…In the FSW welding process, a solid joint of the dissimilar metals is formed by the action of a tool driven by the high-speed rotation of the mechanical spindle. Some scholars have analyzed the quality of the formed FSW welds from the perspective of the spindle performance [22][23][24]. Forcellese et al [22] researched the FSW butt joint of the same material, AZ31 Mg, and observed the changes of the axial force of the spindle during the welding process.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Friction Stir Lap Welding of Al to Mg: Characteristic Signal, Microstructure and Mechanical Properties

et al. 2020

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The spindle characteristic signal (forces and vibrations) at different friction stir lap welding (FSLW) parameters were studied. The result indicated that the spindle force and vibration have different trends with the change of welding parameters. For further study, the spindle dynamic performance evaluation model by means of the Technique for Order Preference by Similarity to the Ideal Solution (TOPSIS method) was established. The model was used to calculate the relative approach degree B under different welding process parameters. The correlation between the characteristic signal and the joint properties was obtained. The model was validated by mechanical performance testing and microscopic observation. The results showed that the model evaluations were consistent with the experimental results.

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“…To observe the forming quality of the joint surface more intuitively, researchers have used a 3D optical profiler to characterize it. Boccarusso et al [15] studied the dissimilar friction stir lap welding (FSLW) of the AA6082 aluminum alloy and AZ31 magnesium alloy. After welding, the joint surface was observed using a 3D optical profiler.…”

Section: Introductionmentioning

confidence: 99%

Fractal Dimension Characterization of Joint Surface Morphology on Dissimilar Friction Stir Lap Welding of Al/Mg

et al. 2019

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The joint surface of the 1060 aluminum and AZ31 magnesium alloy was prepared through friction stir lap welding (FSLW) under different welding process parameters. The joint surface was characterized three-dimensionally using a three-dimensional (3D) optical profiler, and the coordinate data were obtained. The fractal dimension of the joint surface was calculated by the box-width transformation method using a MATLAB program. Furthermore, the influence of the welding process parameters on the fractal dimension of the joint surface was studied. The response surface model was established based on the principle of central composite design (CCD), and analysis of variance (ANOVA) was carried out to test the accuracy of the response surface. The results showed that the joint surface morphology had fractal characteristics, and the fractal dimension could be used as an index to characterize the quality of the joint surface. The change of the welding process parameters had a great impact on the fractal dimension of the joint surface, the interaction between the parameters was small, and the fitting accuracy of the response surface model was high. The fractal dimension of the joint surface decreased with the increase in the welding and rotational speeds and the effect of the rotational speed was more significant.

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Dissimilar friction stir lap welding of AA 6082 - Mg AZ31: Force analysis and microstructure evolution

Cited by 41 publications

References 49 publications

Effect of Pin Length and Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welded Lap Joints of AZ31B-H24 Mg Alloy and AA6061-T6 Al Alloy

Effect of Pin Length and Rotation Speed on the Microstructure and Mechanical Properties of Friction Stir Welded Lap Joints of AZ31B-H24 Mg Alloy and AA6061-T6 Al Alloy

Dissimilar Friction Stir Lap Welding of Al to Mg: Characteristic Signal, Microstructure and Mechanical Properties

Fractal Dimension Characterization of Joint Surface Morphology on Dissimilar Friction Stir Lap Welding of Al/Mg

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