Experimental investigation and metallographic characterization of fiber laser beam welding of Ti-6Al-4V alloy using response surface method |
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| Affiliation: | 1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;2. Laser Material Processing Division, Raja Ramanna Centre for Advanced Technology, Indore, India;3. Homi Bhabha National Institute, BARC Training School Complex, Anushakti Nagar, Mumbai, India;1. Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Electrical Engineering, Amirkabir University of Technology, Iran;1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Solid-State Joining Processes, Max-Planck-Str. 1, Geesthacht, Germany;2. Federal University of São Carlos, Materials Engineering Department, R. Washington Luís Km 235 – SP 310, Sao Carlos, Brazil;3. Federal University of Rio Grande do Sul, Mechanical Engineering Department, Av. Paulo Gama, 110 Farroupilha, Porto Alegre, Brazil;1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;2. Science and Technology on Power Beam Processes Laboratory, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China;1. Institute of Materials Engineering, National Taiwan Ocean University, Keelung 202, Taiwan, ROC;2. Department of Materials Engineering, National Taiwan University, Taipei 106, Taiwan, ROC;1. Department of Mechanics, Mathematics and Management (DMMM), Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy;2. Laboratoire de Procédés et Ingenierie en Mécanique et Matériaux (PIMMM), CNRS Arts et Métiers ParisTech, 151 Bd de l’Hôpital, 75013 Paris, France;1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;2. Co-Innovation Center for Advanced Aero-Engine, Beijing 100191, China |
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| Abstract: | ![]()
In the present study, experimental investigations of fiber-laser-beam-welding of 5 mm thick Ti-6Al-4V alloy are carried out based on statistical design of experiments. The relationship between the process parameters such as welding power, welding speed, and defocused position of the laser beam with the output responses such as width of the fusion zone, size of the heat affected zone, and fusion zone area are established in terms of regression models. Also, the most significant process parameters and their optimum ranges are identified and their percentage contributions on output responses are calculated. It is observed that welding power and speed plays the major role for full penetration welding. Also, welding power shows direct effect whereas welding speed shows the inverse effect on the output responses. The bead geometry is influenced by the defocused position of the laser beam due to the change in power density on the workpiece surface. However, overall fusion zone area is unaffected. Mechanical characterization of the welded samples such as microstructural analysis, hardness, and tensile tests are conducted. It is noticed that the hardness value of the FZ is higher than the HAZ and BM zone due to the difference in cooling rate during welding which promotes the formation of α′ martensitic phase in the FZ. Also, an average hardness value in the FZ is compared for two different defocusing positions (i.e. 1 and 2 mm). It is found that hardness value is higher for 1 mm defocused position than 2 mm due the decrement in grain size below a critical range at 2 mm defocused position. The ultimate tensile strength and % elongation of the welded samples are degraded as compared to BM which can be further improved by post heat treatment. |
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| Keywords: | Ti-6Al-4V alloy Fiber laser beam welding Microstructure Mechanical properties Response surface methodology |
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