Microstructure and joint strength of friction stir spot welded aluminum alloy sheet/plated steel sheet joints

2019 ◽  
Vol 2019.25 (0) ◽  
pp. 19C12
Author(s):  
Koyo AOKI ◽  
Mitsuhiro WATANABE
Keyword(s):  
Aluminum Alloy ◽  
Joint Strength ◽  
Steel Sheet ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Friction Stir ◽  
Spot Welded

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.

Effect of Weld Tip Geometry on Ultrasonic Welding between Steel and Aluminum Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 419-424 ◽  
Author(s):  
Kosuke Nishihara ◽  
Takehiko Watanabe ◽  
Tomohiro Sasaki
Keyword(s):  
Aluminum Alloy ◽  
Mild Steel ◽  
Joint Strength ◽  
Steel Sheet ◽  
Alloy Sheet ◽  
Cylindrical Geometry ◽  
Clamping Force ◽  
Welding Time ◽  
Aluminum Alloy Sheet ◽  
Welding Condition

In this study, authors investigated the effect of horn tip geometry on the mechanical properties of a joint ultrasonically welded between a mild steel sheet and an aluminum alloy sheet. Two types of weld tips with the different contact face geometries were employed. One type of a tip has a cylindrical contact face without knurl. The other type of a tip has flat contact face with knurl. The main results obtained in this study are as follows. Authors successfully welded the mild steel sheet to the aluminum alloy sheet using both of the weld tips. However, the strength of the joint welded by the tip with cylindrical geometry was higher than that welded by the flat tip with knurl under the same welding condition, and the strength of the joint by the tip with cylindrical geometry was twice larger than that by the flat tip with knurl under the optimal welding condition. The strength of the joint increased with increasing the welding time and the clamping force, and showed the maximum under the reasonable welding condition. Excessively long welding time and large clamping force damaged the workpiece surface contacted the horn side tip, resulting in the decrease of the joint strength. It was possible to improve the joint strength using commercially pure aluminum foil with suitable thickness as insert metal.

scholarly journals Performance Analysis of Friction Stir Welded Lightweight Aluminum Alloy Sheet

2020 ◽  
Vol 52 (6) ◽  
pp. 821
Author(s):  
Hongfeng Wang ◽  
Dunwen Zuo ◽  
Shengrong Liu ◽  
Jiafei Pu ◽  
Weiwei Song
Keyword(s):  
Aluminum Alloy ◽  
Performance Analysis ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Friction Stir

scholarly journals The strength of traditional and self-pierced riveted joints

2018 ◽  
Vol 244 ◽  
pp. 01007
Author(s):  
Anna Rudawska ◽  
Izabela Miturska ◽  
Dana Stančeková ◽  
Jacek Mucha
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
Steel Sheet ◽  
Load Capacity ◽  
Sheet Material ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Riveted Joints ◽  
Different Types

The objective of this study is to compare the strength of riveted joints fabricated by traditional riveting (with pre-drilled holes) and self-piercing riveting (SPR) for different types of joints. Riveted joints were produced using steel and aluminum alloy rivets and two types of sheet material: 235JR steel sheet and EN AW 6060 aluminum alloy sheet with the following dimensions: length l = 100 ± 1 mm, width b = 50 ± 1 mm and thickness g = 2 mm. For all tested types of riveted joints (pre-drilled and SPR), 5 sets of joints were fabricated, each set containing 6 samples. The sets of joints differed with respect to the number of rivets (1, 2, 3, 4 and 6 rivets), joint type (single-, three- and four-riveted joints) and lap length. For all tested joints, the highest load capacity was obtained for self-pierced riveted joints, while the lowest - for pre-drilled joints with aluminum alloy rivets. In addition, it was found that the shear strength of self-pierced riveted joints is higher than that of aluminum and steel blind rivets.

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