scholarly journals Microstructure and Fatigue Behaviors of Dissimilar A6061/Galvannealed Steel Joints Fabricated by Friction Stir Spot Welding

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3877
Author(s):  
Koki Kumamoto ◽  
Tsuyoshi Kosaka ◽  
Tatsuya Kobayashi ◽  
Ikuo Shohji ◽  
Yuichiro Kamakoshi
Keyword(s):  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Fatigue Properties ◽  
Joint Interface ◽  
Cycle Fatigue ◽  
Tensile Shear ◽  
Friction Stir ◽  
Shear Fatigue ◽  
Steel Joints ◽  
Residual Melt

The microstructures, tensile shear properties, and tensile shear fatigue properties of dissimilar A6061/Galvannealed steel joints fabricated by friction stir spot welding (FSSW) were investigated. Fe4Al13 phases form as the intermetallic compound (IMC) layer at the joint interface between the A6061 matrix and the galvannealed layer consisting of FeZn7, Fe, and Zn. At the edge of the joint, the stirred layer in which the A6061 matrix and the galvannealed layer are stirred also forms. Moreover, the solidified part of the residual melt discharged from the joint area forms at the outer peripheries of the joint. In this study, FSSW was conducted for two total welding durations: 9 and 10 s. Although the thickness of the remaining A6061 sheet in the welded area decreased with an increase in the welding time, the effects of the total welding time on tensile shear and tensile shear fatigue properties were negligible. A fatigue fracture occurred in the A6061 matrix and at the joint interface at the high cycle fatigue region and the low cycle fatigue region, respectively. In the case of the interfacial fracture, the crack was generated in the solidified part of the residual melt or at the interface between the solidified part and the stirred layer.

Effects of process time and thread on tensile shear strength of Al alloy lap joint produced by friction stir spot welding

2010 ◽  
Vol 24 (3) ◽  
pp. 169-175 ◽  
Author(s):  
Mitsuo Fujimoto ◽  
Daisuke Watanabe ◽  
Natsumi Abe ◽  
Sato S. Yutaka ◽  
Hiroyuki Kokawa
Keyword(s):  
Shear Strength ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Process Time ◽  
Al Alloy ◽  
Tensile Shear Strength ◽  
Lap Joint ◽  
Tensile Shear ◽  
Friction Stir

scholarly journals Effect of Different Friction Stir Spot Welding Techniques on the Mechanical Properties and Microstructure of Aluminum AA2024-T3

2019 ◽  
Vol 22 (2) ◽  
pp. 117-123
Author(s):  
Akeel Z. Mahdi ◽  
Samir A. Amin ◽  
Sadeq H. Bakhy
Keyword(s):  
Spot Welding ◽  
Shear Force ◽  
Mechanical Tests ◽  
Friction Stir Spot Welding ◽  
Tensile Shear ◽  
Shear Tests ◽  
Friction Stir ◽  
Comparison Results ◽  
Microstructure Examination ◽  
Tool Pin

This paper presents a comparison of using different techniques for stir spot welding of Aluminum 2024-T3, which are refill friction stir spot welding (RFSSW), edited (RFSSW-pin) and conventional friction stir spot welding (FSSW), depending on the obtained tensile shear strength property. Specimens were prepared from AA2024-T3 sheet for chemical analysis and mechanical tests. Workpieces were stir spot welded utilizing the above mentioned techniques at four rotational speeds (2000, 2500, 3000 and 4000 rpm) using tool pin diameters (5 and 7 mm) for conducting the tensile shear tests. The microhardness along the cross section of the welded specimens was conducted at the best conditions as well as the microstructure examination. The comparison results revealed that at the rotational speeds (2000 and 4000 rpm) in both cases of tool pin (5 and 7 mm), the ultimate tensile shear force was slightly higher than that for other speeds. However, the ultimate tensile shear force was found higher at 3000 rpm speed with a tool pin 7 mm. The microhardness results manifested a W-shape at the best conditions. Finally, the microstructure examination depicted the morphology of the main zones of the weld joint.

Comparison of Properties on Withdrawing and Refill Friction Stir Spot Welding Joints

2014 ◽  
Vol 633-634 ◽  
pp. 601-606
Author(s):  
Xi Jing Wang ◽  
Xiao Long Wang ◽  
Zhong Ke Zhang ◽  
Wen Xia Jing
Keyword(s):  
Spot Welding ◽  
Fracture Morphology ◽  
Friction Stir Spot Welding ◽  
Shear Load ◽  
Tensile Shear ◽  
Optimal Process ◽  
Cross Sectional ◽  
Friction Stir ◽  
Welding Joints ◽  
The Cross

The 2 mm sheet of 6082 - T6 aluminum alloy was carried to develop refill friction stir welding and withdrawing friction stir spot welding,the forming of solder joints , the cross-sectional microstructure and fracture morphology of welding joints were observed and analyzed, the cross-sectional microhardness of welding joints were tested. Tensile shear load and fracture mode were contrasted simultaneously. The results showed that smooth surface and free of macroscopic defects of welding joints could be obtained in both welding type. Tensile shear load of WFSSW was up to 10.28kN under the optimal process parameters greater than RFSSW’s 8.62kN.

scholarly journals Effect of Zn Interlayer Particles on Mechanical Properties and Microstructure of Friction Stir Spot Welding Aluminum Alloy

2018 ◽  
Vol 218 ◽  
pp. 04005
Author(s):  
Lingga Arti Saputra ◽  
Nurul Muhayat ◽  
Triyono
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Dwell Time ◽  
Aluminum Matrix ◽  
Friction Stir Spot Welding ◽  
Motor Vehicles ◽  
Shear Load ◽  
Tensile Shear ◽  
Friction Stir ◽  
Spot Welded

Global warming can be reduced by controlling emissions in motor vehicles. Lightweight aluminum materials can lower the engine work so as to reduce fuel consumption.The effect of dwell time on mechanical properties and microstructure friction stir spot welded AA1100 with particle interlayer Zn were investigated. The result shows that the particle interlayer Zn affect to the mechanical properties. The tensile shear load friction stir spot welded AA1100 with particle interlayer Zn is higher than hart of without particle interlayer Zn. In line with tensile shear load that the hardness of friction stir spot welded Al with particle interlayer Zn got the higher hardness than of without particle interlayer Zn. The addition of particle interlayer Zn reduce the hook defect and spread in the aluminum matrix as solid solution.

scholarly journals Investigasi dan Optimasi Parameter Proses Micro Friction Stir Spot Welding Material A1100/Cu1100P Menggunakan Metode Taguchi

2019 ◽  
Vol 3 (2) ◽  
pp. 59
Author(s):  
Pathya Rupajati ◽  
Pathya Rupajati
Keyword(s):  
Friction Stir Welding ◽  
Intermetallic Compound ◽  
Spot Welding ◽  
Dwell Time ◽  
Friction Stir Spot Welding ◽  
Shear Load ◽  
Tool Rotational Speed ◽  
Tensile Shear ◽  
Plunge Depth ◽  
Friction Stir

Abstrak  Salah satu karakteristik sifat mekanis yang penting untuk dianalisis adalah tensile shear load. Penelitian ini bertujuan untuk melakukan optimasi tensile shear load hasil pengelasan micro friction stir welding (µFSSW) pada material AA1100 dan Cu1100P menggunakan metode Taguchi. Rancangan percobaan yang digunakan dalam penelitian ini adalah matriks orthogonal array L8 dengan memvariasikan parameter proses pengelasan yaitu dwell time dan plunge depth yang memiliki masing-masing empat level dan dua level. Sedangkan variabel konstan yang digunakan adalah tool rotational speed sebesar 33.000 rpm. Hasil penelitian menunjukkan bahwa parameter pengelasan yang memiliki kontribusi terbesar dalam meningkatkan tensile shear load hasil pengelasan micro friction stir spot welding adalah dwell time, yang menghasilkan tensile shear load sebesar 265,12 N dengan seting kombinasi dwell time pada 5 s dan plunge depth pada 0,7 mm. Hasil struktur mikro juga menunjukkan terlihat adanya flash dan hook defect, tetapi tidak menujukkan adanya intermetallic compound dan crack. Kata kunci: A1100, µFSSW, Taguchi, Dwell time, Plunge Depth

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