Measurement of the bead profile and microstructural characterization of a CO2 laser welded AISI 904 L super austenitic stainless steel |
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| Authors: | P Sathiya MY Abdul Jaleel |
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| Institution: | 1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Provincial Key Lab of Advanced Welding Technology, School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003,China;1. Dept. of Physics, M.I.E.T. Engineering College, Trichy 620007, Tamil Nadu, India;2. Dept. of Physics, M.A.R. College of Engineering & Technology, Trichy 621316, Tamil Nadu, India;3. PG and Research Dept. of Chemistry, Jamal Mohamad College (Autonomous), Trichy 620020, Tamil Nadu, India;4. Dept. of Physics, Annamalai University, Annamalai Nagar 608002, Tamil Nadu, India;5. Dept. of Research and Development, PRIST University, Vallam, Thanjavur 613403, Tamil Nadu, India;6. Dept. of Physics, Ahi Evran University, Kirsehir 40040, Turkey;1. Department of Mechanical Engineering, Annamalai University, Annamalai nagar, Tamilnadu, 608002, India;2. Department of Manufacturing Engineering, Annamalai University, Annamalai nagar, Tamilnadu, 608002, India;1. Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;3. School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;4. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | Laser welding of AISI 904 L super austenitic stainless steel using a diffusion cooled slab 3.5 kW CO2 laser and employing two different shielding gases, namely argon and helium, was carried out. The laser weld bead profile depends on various parameters such as beam power (BP), travel speed (TS) and focal position (FP) of the laser spot. These parameters have to be selected suitably to obtain the desirable output. The cross sectioned area of the bead profiles measured using an optical microscope to determine the bead width and depth of penetration. X-ray diffraction used for phase identification confirmed that the weld structure was fully austenitic and dendritic. Hardness was observed to increase in the weld bead with respect to the parent metal and it was related to the microstructural refinement induced by a rapid cooling of the weld zone. |
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