Comprehensive investigation into the dissimilar friction stir welding of Al 2024 to St37

In the present work, feasibility study on dissimilar friction stir welding (FSW) of immiscible materials of St37 and Al 2024 is fully investigated. Towards that end, three tool rotational speeds of 224, 355, and 450 rpm along with three traverse speeds of 20, 25, and 31.5 mm/min were employed to ach...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2017-12, Vol.93 (9-12), p.3599-3613
Main Authors: Mostafapour, Amir, Jamalian, Hasan Mohammadzadeh, Bolghari, Amir Jafari, Chamanara, Amir
Format: Article
Language:English
Subjects:
Aluminum base alloys
CAE) and Design
Computer-Aided Engineering (CAD
Dissimilar material joining
Dissimilar materials
Electron microscopy
Engineering
Feasibility studies
Friction stir welding
Industrial and Production Engineering
Intermetallic compounds
Investigations
Mechanical Engineering
Mechanical properties
Media Management
Microhardness
Microscopy
Optical microscopy
Optical properties
Original Article
Process parameters
Scanning electron microscopy
Tensile properties
Tensile strength
Ultimate tensile strength
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Summary:In the present work, feasibility study on dissimilar friction stir welding (FSW) of immiscible materials of St37 and Al 2024 is fully investigated. Towards that end, three tool rotational speeds of 224, 355, and 450 rpm along with three traverse speeds of 20, 25, and 31.5 mm/min were employed to achieve optimum FSW parameters. Besides, effects of process parameters on microhardness and tensile properties of the joints were studied as well. Optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were also executed to investigate the microstructure and the brittle intermetallic compounds (IMCs) within the stir zone (SZ) which revealed the presence of FeAl 3 IMCs within this region. Lowering the rotational speed led to further diminution of IMCs and resulted in superior mechanical properties. Increasing the rotational speed raised the microhardness values of the SZ due to the grains refinement and increase of the IMCs. Additionally, increasing the traverse speed raised the ultimate tensile strength of the joints due to the reduction of IMCs and also the annealing effect of the heat input. The highest ultimate tensile strength of 331.5 MPa was obtained at rotational and traverse speeds of 224 rpm and 31.5 mm/min, respectively.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-017-0778-z