Experimental and numerical investigation of laser shock synchronous welding and forming of Copper/Aluminum |
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| Institution: | 1. CEMUC – Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;2. ADAI – Assoc. for Dev. of Ind. Aerodynamics, LEDAP Lab. Energetics and Detonics, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, Polo II, 3030-788 Coimbra, Portugal;3. ESAD.CR, Polytechnic Institute of Leiria, Rua Isidoro Inácio Alves de Carvalho, 2500-321 Caldas da Rainha, Portugal;1. Department of Opto-electronic Engineering, Shijiazhuang Mechanical Engineering College, Shijiazhuang 050003, PR China;2. China Defense Science & Technology Information Center, Peking 100138, PR China;1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China;2. City Institute, Dalian University of Technology, Dalian 116600, China;1. Department of Neurology, Children’s National Health System, 111 Michigan Avenue, Northwest, Washington, DC 20010, USA;2. Center for Genetic Medicine Research, Children’s National Health System, 111 Michigan Avenue, Northwest, Washington, DC 20010, USA;3. Department of Neurology, Lucile Packard Children''s Hospital, Stanford University School of Medicine, 730 Welch Rd, Palo Alto, CA 94304, USA;4. Department of Integrated Systems Biology, George Washington University School of Medicine, 2150 Pennsylvania Ave NW, Washington, DC 20037, USA;5. Department of Integrated Systems Biology, George Washington University School of Medicine, 2150 Pennsylvania Ave NW, Washington, DC 20037, USA |
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| Abstract: | A novel laser shock synchronous welding and forming method is introduced, which utilizes laser-induced shock waves to accelerate the flyer plate towards the base plate to achieve the joining of dissimilar metals and forming in a specific shape of mold. The samples were obtained with different laser energies and standoff distances. The surface morphology and roughness of the samples were greatly affected by the laser energy and standoff distances. Fittability was investigated to examine the forming accuracy. The results showed that the samples replicate the mold features well. Straight and wavy interfaces with un-bonded regions in the center were observed through metallographic analysis. Moreover, Energy Disperse Spectroscopy analysis was conducted on the welding interface, and the results indicated that a short-distance elemental diffusion emerged in the welding interface. The nanoindentation hardness of the welding regions was measured to evaluate the welding interface. In addition, the Smoothed Particle Hydrodynamics method was employed to simulate the welding and forming process. It was shown that different standoff distances significantly affected the size of the welding regions and interface waveform characteristics. The numerical analysis results indicated that the opposite shear stress direction and effective plastic strain above a certain threshold are essential to successfully obtain welding and forming workpiece. |
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| Keywords: | Laser shock welding Laser shock forming Wavy interface Fittability Nanoindentation hardness Energy Disperse Spectroscopy |
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