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Improving appearance and mechanical strength of aluminum-polypropylene/talc composite friction stir joint using a novel tool design
, Article International Journal of Advanced Manufacturing Technology ; Volume 121, Issue 5-6 , 2022 , Pages 3717-3730 ; 02683768 (ISSN) ; Movahedi, M ; Ozlati, A ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
In this research, friction stir joining of aluminum-polypropylene/talc composite was investigated due to the numerous applications of aluminum-polymer joints in automotive and aerospace industry. A novel tool design, including a rotary/stationary holder, was used to improve the appearance and mechanical performance of friction stir lap joints by preventing the mixed molten polymer and aluminum particles from exiting the stirred zone. Effect of tool transverse speed on the joint microstructure and strength was investigated. Using the rotary/stationary holder, tensile-shear strength of the joints increased (by ~ 45 to ~ 220% at various transverse speeds). Since during the tensile-shear test...
Upset-resistance welding of aluminium to copper rods: effect of interface on performance
, Article Materials Science and Technology (United Kingdom) ; Volume 34, Issue 15 , 2018 , Pages 1830-1838 ; 02670836 (ISSN) ; Movahedi, M ; Kokabi, A. H ; Ozlati, A ; Sharif University of Technology
Taylor and Francis Ltd
2018
Abstract
Upset resistance dissimilar welding of aluminium and copper narrow rods was performed. Effect of the interface characteristics was studied on the joint mechanical and electrical properties. Upset resistance welding (URW) was successful for production of joints with high strength and electrical conductivity between aluminium and copper rods. Reaction layer at the joint interface was composed of the Al2Cu cellular phase and lamellar eutectic structure of α-Al and Al2Cu. Enhancement of the welding current and decrease in the upset force increased the reaction layer thickness and strength of the joint. URW had no significant detrimental effect on the electrical conductivity of the weld zone....