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Thermal analysis of laser beam welding of nickel-based super alloy Inconel 625 to AISI 316L, using Gaussian optics theory in keyhole

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Abstract

Keyhole laser welding is widely used as an industrial joining method in recent years, but it is not quantitatively understood due to its high complexity. This paper aims to provide a computational platform to quantitatively predict the thermal history of various locations such as HAZ and WM in the welded parts. The model characterizes the absorbed laser power in the keyhole wall at different depths by applying emission theory of light. Bremsstrahlung reflection, Fresnel absorption coefficient and multiple reflection, obtained from a volumetric heat flux distribution, are used to calculate using the absorbed laser beam density in the butt joint of nickel-based super alloy Inconel 625 to AISI 316L. The simulation results show that the model predicts the thermal history in various locations in good agreement with experimental results. The presented model provides a volumetric model to simulate the heat flux profile using various Fresnel absorption coefficients over the sample depth that captures the actual operation conditions.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Lavizan, Tehran, Iran

    Ahmad Nejad Ebrahimi, N. Bani Mostafa Arab & M. Hoseinpour Gollo

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  1. Ahmad Nejad Ebrahimi
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  2. N. Bani Mostafa Arab
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  3. M. Hoseinpour Gollo
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Correspondence to Ahmad Nejad Ebrahimi.

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Technical Editor: Alexandre Mendes Abrao.

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Ebrahimi, A.N., Arab, N.B.M. & Gollo, M.H. Thermal analysis of laser beam welding of nickel-based super alloy Inconel 625 to AISI 316L, using Gaussian optics theory in keyhole. J Braz. Soc. Mech. Sci. Eng. 38, 1199–1206 (2016). https://doi.org/10.1007/s40430-015-0422-5

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  • DOI: https://doi.org/10.1007/s40430-015-0422-5

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