TAILIEUCHUNG - Microstructure and fracture behavior of friction stir lap welding of dissimilar AA 6060-T5/ Pure copper

This study aims to understand the uncertainty about the optimum or best pin position (Dp) for friction stir lap welding (FSLW) of Al-Cu. Tensile shear testing is used to determine the Mechanical strength of FSL welds under static loading. | Nội dung Text Microstructure and fracture behavior of friction stir lap welding of dissimilar AA 6060-T5 Pure copper Engineering Solid Mechanics 7 2019 217-228 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Microstructure and fracture behavior of friction stir lap welding of dissimilar AA 6060-T5 Pure copper Shubhavardhan Ramadurga Narasimharajua and Surendran Sankunnyb a Department of Mechanical Engineering University of Saskatchewan Saskatoon Canada b Indian Institute of Technology Madras Chennai India A R T I C L EI N F O ABSTRACT Article history This study aims to understand the uncertainty about the optimum or best pin position Dp for Received 27 December 2018 friction stir lap welding FSLW of Al-Cu. Tensile shear testing is used to determine the Accepted 18 May 2019 Mechanical strength of FSL welds under static loading. Fracture strength σLap corresponding to Available online the maximum load in a test over the sample width is used as the strength value. Interface 18 May 2019 Keywords microstructures differ depending on whether the tool pin penetrates the lapping interface. It has Friction stir lap welding been found that σLap values of the defect free weld samples vary quite significantly and in general Aluminum are significantly higher than those reported in the literature. When the pin penetration is close to Copper zero no intermetallic layers were formed hence the value of σLap was zero. When the pin Interface microstructure penetration is the commonly observed a thin Al Cu interface layer forms and this layer Intermetallic layer does not grow beyond 3µm. It is shown that the thin interfacial layer can withstand a high tensile- Fracture strength shear load and thus the adjacent Al material shears to fracture. When the pin penetrates more than the commonly observed mix stir zone MSZ forms and values of σLap are lower than that of pin penetration welds but remain quite high. .

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