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Achieving special mechanical properties with considering dwell time of AA5052 sheets welded by a simple novel friction stir spot welding
Abstract In this study, a new method was proposed to remove the keyhole with the title of "protrusion friction stir spot welding", and the effect of the tool dwelling time on microstructure and mechanical properties of aluminum alloy 5052 sheets was investigated. Welding was carried out at different dwelling times of 3–18 s at a tool rotational speed of 800 rpm. Macrostructure and microstructure examinations indicated that this new method has the ability to create a non-defect metallurgical joint with a homogeneous and fine grain structure. The results of the micro hardness test showed the hardness reduction of the SZ from 57.4 HV to 48.15HV with increase in the too dwelling time (3–18 s). The tensile properties of the welding samples were evaluated using a tensile shear test. The results showed a reduction in maximum failure load from 4384.6 N to 3331 N with increase in the tool dwelling time (from 3 to 18 s). With considering dwelling time and sheets thickness, the welds produced by the present work illustrated better load capacity than other techniques.
Graphical abstract Display Omitted
Highlights The apparent surface of the welds in this method was quite smooth. Tensile properties were affected by the hook and effective thickness of the upper sheet. All samples welded by PFSSW were failed in a circumferential failure mode. Dwell time was an effective parameter on the welded samples as well as saving time. The welds produced by PFSSW exhibited the best load bearing capacity at low dwell time.
Achieving special mechanical properties with considering dwell time of AA5052 sheets welded by a simple novel friction stir spot welding
Abstract In this study, a new method was proposed to remove the keyhole with the title of "protrusion friction stir spot welding", and the effect of the tool dwelling time on microstructure and mechanical properties of aluminum alloy 5052 sheets was investigated. Welding was carried out at different dwelling times of 3–18 s at a tool rotational speed of 800 rpm. Macrostructure and microstructure examinations indicated that this new method has the ability to create a non-defect metallurgical joint with a homogeneous and fine grain structure. The results of the micro hardness test showed the hardness reduction of the SZ from 57.4 HV to 48.15HV with increase in the too dwelling time (3–18 s). The tensile properties of the welding samples were evaluated using a tensile shear test. The results showed a reduction in maximum failure load from 4384.6 N to 3331 N with increase in the tool dwelling time (from 3 to 18 s). With considering dwelling time and sheets thickness, the welds produced by the present work illustrated better load capacity than other techniques.
Graphical abstract Display Omitted
Highlights The apparent surface of the welds in this method was quite smooth. Tensile properties were affected by the hook and effective thickness of the upper sheet. All samples welded by PFSSW were failed in a circumferential failure mode. Dwell time was an effective parameter on the welded samples as well as saving time. The welds produced by PFSSW exhibited the best load bearing capacity at low dwell time.
Achieving special mechanical properties with considering dwell time of AA5052 sheets welded by a simple novel friction stir spot welding
Farmanbar, N. (author) / Mousavizade, S.M. (author) / Ezatpour, H.R. (author)
Marine Structures ; 65 ; 197-214
2019-01-24
18 pages
Article (Journal)
Electronic Resource
English
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