Mechanical Interlocking of an Aluminum Alloy and SS400 Structural Steel through Friction-Stir Spot Forming (FSSF)

2018 ◽  
Vol 926 ◽  
pp. 17-22
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Ryuji Ishikawa ◽  
Tadashi Nishihara
Keyword(s):  
Aluminum Alloy ◽  
Structural Steel ◽  
Steel Sheet ◽  
Mechanical Interlocking ◽  
Screw Hole ◽  
Microstructural Observation ◽  
Friction Stir ◽  
Hardness Tests ◽  
Dissimilar Alloys ◽  
Novel Method

In the present study, a novel method for mechanically interlocking the dissimilar alloys of A6061-T6 aluminum alloy and SS400 structural steel using friction-stir forming (FSF) is suggested. In this study, the aluminum alloy is placed on top of a steel sheet containing a screwed hole. The present study suggests that friction-stir spot forming (FSSF) can be used to form a mechanical interlock between the aluminum alloy and steel sheet. FSSF is conducted on top of the aluminum alloy, which produces sufficient heat to plasticize the aluminum alloy. This results in a flow of aluminum into the screw hole in the steel, due to the plastic deformation, thereby mechanically interlocking the aluminum with the steel. Moreover, with the proposed method, the authors present a new concept of an easily separable joining of dissimilar alloys. The mechanical properties of the developed interlock are investigated through tensile and hardness tests and microstructural observation.

Mechanical Interlocking of Titanium and Steel Using Friction Stir Forming

2018 ◽  
Vol 792 ◽  
pp. 59-64
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Shun Orihara ◽  
Tadashi Nishihara ◽  
Takahiro Ohashi
Keyword(s):  
Steel Sheet ◽  
Pure Titanium ◽  
Mechanical Interlocking ◽  
Titanium Plate ◽  
Screw Hole ◽  
Microstructural Observation ◽  
Friction Stir ◽  
Hardness Tests ◽  
Dissimilar Alloys ◽  
Novel Method

This study presents a novel method for mechanically interlocking dissimilar alloys of pure titanium with steel through using the principles of friction stir forming (FSF) technique. In present study, titanium plate is placed on top of a steel sheet containing a screwed hole. FSF is conducted on top of the titanium alloy, which produces sufficient heat to plasticize the alloy. This results in a flow of titanium into the screw hole in the steel, due to the plastic deformation, thereby mechanically interlocking titanium with the steel. The mechanical properties of the developed interlock are investigated through tensile and hardness tests and microstructural observation.

Production of a Superplastic Vibration-Damping Steel Sheet Composite Using Friction Stir Forming

2016 ◽  
Vol 838-839 ◽  
pp. 574-580 ◽  
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Takahiro Hara ◽  
Tadashi Nishihara
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Superplastic Forming ◽  
Vibration Damping ◽  
Milling Machine ◽  
Mechanical Interlocking ◽  
Friction Stir ◽  
Superplastic Alloy ◽  
Novel Method ◽  
And Diffusion

This study proposes a novel method of manufacturing composite vibration-damping steel sheet with Zn-22Al superplastic alloy using friction stir forming (FSF). Trials of mechanical interlocking of steel sheet with Zn-22Al superplastic alloy using FSF were carried out on a modified milling machine. The results are discussed in terms of residual microstructures and mechanical properties. We concluded that cladding steel sheet with Zn-22Al superplastic alloy using FSF results in superplastic forming and diffusion bonding.

Formation and Structure of Work Material in the Friction Stir Forming Process

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Sladjan Lazarevic ◽  
Kenneth A. Ogata ◽  
Scott F. Miller ◽  
Grant H. Kruger ◽  
Blair E. Carlson
Keyword(s):  
Steel Sheet ◽  
Dissimilar Materials ◽  
Mechanical Interlocking ◽  
Forming Process ◽  
Friction Stir ◽  
Joint Structure ◽  
Work Material ◽  
Formation Zone ◽  
Significant Process ◽  
Geometrical Effects

Friction stir forming (FSF) is a new environmentally friendly manufacturing process for lap joining of dissimilar materials. Fundamentally, this process is based on frictionally heating and mechanically stirring work material of the top piece in a plasticized state to form a mechanical interlocking joint within the bottom material. In this research, the significant process parameters were identified and optimized for Al 6014 alloy and mild steel using a design of experiments (DOE) methodology. The overall joint structure and grain microstructure were mapped as the FSF process progressed and the aluminum work material deformed through different stages. It was found that the work material within the joint exhibited two layers, thermomechanical affected zone, which formed due to the contact pressure and angular momentum of the tool, and heat affected formation zone, which was composed of work material formed through the hole in the steel sheet and into the anvil cavity. Two different geometries of anvil design were employed to investigate geometrical effects during FSF of the aluminum. It was found that the direction and amount of work material deformation under the tool varies from the center to the shoulder.

Nondestructive Evaluation of Friction Stir-Welded Aluminum Alloy to Coated Steel Sheet Lap Joint

2015 ◽  
Vol 24 (11) ◽  
pp. 4192-4199 ◽  
Author(s):  
H. Das ◽  
A. Kumar ◽  
K. V. Rajkumar ◽  
T. Saravanan ◽  
T. Jayakumar ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Nondestructive Evaluation ◽  
Steel Sheet ◽  
Coated Steel ◽  
Lap Joint ◽  
Friction Stir ◽  
Coated Steel Sheet

Friction Stir Forming for Mechanical Interlocking of Ultra-Thin Stainless Steel Strands and Aluminum Alloys

2018 ◽  
Vol 382 ◽  
pp. 114-119 ◽  
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Tadashi Nishihara
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloys ◽  
Tensile Tests ◽  
Al Alloys ◽  
Milling Machine ◽  
Mechanical Interlocking ◽  
Friction Stir ◽  
Vertical Milling ◽  
Vertical Milling Machine ◽  
Novel Method

In this study, a novel method of mechanical interlocking of super-thin stainless steel strands with different aluminum alloys was conducted by using friction stir forming (FSF). The potential for the development of a multi-functional composite material was studied experimentally. It was concluded that FSF can successfully interlock stainless steel strands and different Al alloys and presents the possibility of improving the mechanical properties of the alloy. Trials of FSF were carried out on a modified vertical milling machine. The results are discussed in terms of microstructure observations, hardness distributions and tensile tests.

Joint Interface Morphology of Friction Stir Spot Welded Aluminum Alloy Sheets and Plated Steel Sheets

2010 ◽  
Vol 654-656 ◽  
pp. 970-973 ◽  
Author(s):  
Keyan Feng ◽  
Mitsuhiro Watanabe ◽  
Shinji Kumai
Keyword(s):  
Aluminum Alloy ◽  
Melting Temperature ◽  
Steel Sheet ◽  
Alloy Sheet ◽  
Zinc Alloy ◽  
Joint Interface ◽  
Aluminum Alloy Sheet ◽  
Pure Zinc ◽  
Friction Stir ◽  
Steel Sheets

Friction stir spot welding (FSSW) was applied to lap joining of aluminum alloy sheets and steel sheets. A 1.2 mm-thick non-plated carbon steel sheet and plated steel sheets with zinc alloy (ZAM), pure zinc (GI), zinc alloy including Fe (GA) and Al-Si alloy (AS) were prepared. The melting temperature of the plated layer is 330, 420, 880 and 640°C, respectively. A 1.1 mm-thick 6022 aluminum alloy sheet was overlapped on the steel sheet. A rotating tool was inserted from the aluminum alloy sheet side and the probe tip was kept at the position of 0.2 mm above the lapped interface for 3 seconds. For ZAM and GI, original plated layers were removed from the interface and intermediate layers were formed at the joint interface. This is because the melting temperature of the plated layer was lower than the interface temperature under the rotating probe tip during the FSSW. In contrast to that, the partial original plated layer remained after welding, and additional layer formed at the plated layer /aluminum alloy interface for GA. For AS, Al-Fe intermetallic compound layer, which was formed at the original Al-Si alloy plated steel surface remained.

Friction-Stir Spot Mechanical Joining between Hot-Dip 55% Aluminum–Zinc Alloy-Coated Steel Sheet and A5083 Aluminum Alloy Plate Using Conventional Punching

2020 ◽  
Vol 853 ◽  
pp. 8-12
Author(s):  
Takahiro Ohashi ◽  
Taiki Ohno ◽  
Yuki Shiraishi ◽  
Hamed Mofidi Tabatabaei ◽  
Tadashi Nishihara
Keyword(s):  
Aluminum Alloy ◽  
Steel Sheet ◽  
Rear Surface ◽  
Zinc Alloy ◽  
Coated Steel ◽  
Alloy Plate ◽  
Mechanical Joining ◽  
Friction Stir ◽  
Coated Steel Sheet ◽  
Aluminum Alloy Plate

In this study, we fabricated a mechanical joining with spot friction-stirring between an aluminum alloy plate and an aluminum–zinc alloy-coated steel sheet; this was achieved by utilizing a conventional press-punching preprocess. In the preprocessing, a hot-dip 55% aluminum–zinc alloy-coated steel sheet was punched using a press and an inclined surface was generated at the wall of a punched hole due to shear droop. Subsequently, an A5083P-O aluminum alloy plate was positioned against it, and friction stirring was conducted on its rear surface. The hole was filled with the aluminum alloy to generate a mechanical interlock at the tilt of the wall. Further, we evaluated its cross tensile strength (CTS) and tensile shear strength (TSS) and obtained an average CTS and TSS of 368 kN and 1470 kN, respectively.

Sign in / Sign up

Export Citation Format

Share Document