Optimization of parameters to attain higher tensile strength in pulsed Nd: YAG laser welded Hastelloy C-276–Monel 400 sheets

•Develop a numerical expression to predict the tensile strength of welded joint.•Fine dendritic grains and a narrow HAZ is witnessed in optimum condition.•Tensile strength of the dissimilar joints is reported. In this study, an empirical relationship is developed to predict the tensile strength of p...

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Bibliographic Details
Published in:Infrared physics & technology 2019-08, Vol.100, p.1-10
Main Authors: Shanthos Kumar, G., Raghukandan, K., Saravanan, S., Sivagurumanikandan, N.
Format: Article
Language:English
Subjects:
Hastelloy C-276
Microstructure
Monel 400
Optimization
Pulsed Nd: YAG laser welding
Tensile strength
XRD
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Summary:•Develop a numerical expression to predict the tensile strength of welded joint.•Fine dendritic grains and a narrow HAZ is witnessed in optimum condition.•Tensile strength of the dissimilar joints is reported. In this study, an empirical relationship is developed to predict the tensile strength of pulsed Nd: YAG laser welded Hastelloy C-276–Monel 400 alloy sheets by optimizing the process parameters viz., welding speed, pulse energy and pulse duration. Experiments were conducted based on a three factor, three level, central composite face centered design with full desirability. Analysis of Variance (ANOVA) results indicate that the welding speed holds the greatest influence on tensile strength, followed by pulse energy and pulse duration. Microstructural studies of the optimized condition reveal full penetration weld with finer dendritic grains and a narrow heat affected zone (HAZ). Tensile fracture surface of the optimized weld exhibits a ductile mode of fracture with high tensile strength. XRD analysis of weld zone exposed the formation of various Chromium-rich carbide and Nickel-rich oxides precipitates.
ISSN:1350-4495
1879-0275
DOI:10.1016/j.infrared.2019.05.002