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Investigations on metallurgical and mechanical properties of CO2 laser beam welded Alloy 825

Publication Type : Journal Article

Publisher : Canadian Metallurgical Quarterly

Source : Canadian Metallurgical Quarterly, Taylor and Francis Ltd., p.1-13 (2017)

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Keywords : Carbon dioxide, Full-penetration weld, Hardness, Intermetallics, keyhole technique, Laser beam welding, Laser beams, Mechanical properties, Mechanical testing, Metallurgical and mechanical properties, Metals, Micro-segregation, Microhardness, Microstructural changes, Microstructure, Microstructure and mechanical properties, Nickel alloys, Scanning electron microscopic, Vickers microhardness, Welding, Welds

Campus : Coimbatore

School : School of Engineering

Department : Mechanical Engineering

Year : 2017

Abstract : In the research work, an attempt is made to join nickel-based alloy 825 by employing CO2 laser beam welding. Successful full penetration weld joint of a 5 mm thick plate is achieved with a very low heat input of 120 J-mm−1. Narrow weld bead width of 0.6 mm at the root and 1.6 mm at the cap is observed fusion zone; the interface and base metal microstructures have been examined using both optical and scanning electron microscopic techniques to understand the microstructural changes which have occurred due to laser welding. A range of tests of Vickers micro hardness, tensile and impact tests had been performed on the weldment to ascertain the mechanical properties of the joint. Tensile failure at the base metal and a 180° root bend test conducted on the weldment ascertain the soundness of the weld joint produced. An attempt is made to correlate the microstructure and mechanical properties of the weldment. Intermetallics TiN and Al4C3 observed in the SEM/EDS analysis at the fusion zone are found to have improved the weld metal strength and hardness. © 2017 Canadian Institute of Mining, Metallurgy and Petroleum

Cite this Research Publication : M. Arivarasu, Roshith, P., Dr. Padmanaban R., Dr. Thirumalini S., Prabhakar, K. V. Phani, and Padmanabham, G., “Investigations on metallurgical and mechanical properties of CO2 laser beam welded Alloy 825”, Canadian Metallurgical Quarterly, pp. 1-13, 2017.

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