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Numerical Model for Predicting Bead Geometry and Microstructure in Laser Beam Welding of Inconel 718 Sheets

Department of Mechanical Engineering, Faculty of Engineering Bilbao, University of the Basque Country (UPV/EHU), Plaza Torres Quevedo 1, 48013 Bilbao, Spain
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Metals 2018, 8(7), 536; https://doi.org/10.3390/met8070536
Received: 19 June 2018 / Revised: 29 June 2018 / Accepted: 4 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Laser Welding of Industrial Metal Alloys)
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Abstract

A numerical model was developed for predicting the bead geometry and microstructure in laser beam welding of 2 mm thickness Inconel 718 sheets. The experiments were carried out with a 1 kW maximum power fiber laser coupled with a galvanometric scanner. Wobble strategy was employed for sweeping 1 mm wide circular areas for creating the weld seams, and a specific tooling was manufactured for supplying protective argon gas during the welding process. The numerical model takes into account both the laser beam absorption and the melt-pool fluid movement along the bead section, resulting in a weld geometry that depends on the process input parameters, such as feed rate and laser power. The microstructure of the beads was also estimated based on the cooling rate of the material. Features such as bead upper and bottom final shapes, weld penetration, and dendritic arm spacing, were numerically and experimentally analyzed and discussed. The results given by the numerical analysis agree with the tests, making the model a robust predictive tool. View Full-Text
Keywords: laser; welding; LBW; model; microstructure; SDAS; bead seam; wobble strategy; Inconel 718 laser; welding; LBW; model; microstructure; SDAS; bead seam; wobble strategy; Inconel 718
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Hernando, I.; Arrizubieta, J.I.; Lamikiz, A.; Ukar, E. Numerical Model for Predicting Bead Geometry and Microstructure in Laser Beam Welding of Inconel 718 Sheets. Metals 2018, 8, 536.

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