# Characterisation of weldpool shapes in the laser welding of thick plates

Strusevich, Nadezhda V., Pericleous, Koulis ORCID: 0000-0002-7426-9999 and Hughes, Michael (2002) Characterisation of weldpool shapes in the laser welding of thick plates. In: Mathematical Modelling of Weld Phenomena. Materials Modelling, 6 . Maney Publishing for the Institute of Materials, Minerals and Mining, London, England, UK, pp. 83-92. ISBN 9781902653563

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## Abstract

We consider the problem of finding the heat distribution and the shape of the liquid fraction during laser welding of a thick steel plate using the finite volume CFD package PHYSICA. Since the shape of the keyhole is not known in advance, the following two-step approach to handling this problem has been employed. In the first stage, we determine the geometry of the keyhole for the steady-state case and form an appropriate mesh that includes both the workpiece and the keyhole. In the second stage, we impose the boundary conditions by assigning temperature to the walls of the keyhole and find the heat distribution and the shape of the liquid fraction for a given welding speed and material properties. We construct a fairly accurate approximation of the keyhole as a sequence of include sliced cones. A formula for finding the initial radius of the keyhole is derived by determining the radius of the vaporisation isotherm for the line heat source. We report on the results of a series of computational experiments for various heat input values and welding velocities.

Item Type: Conference Proceedings Mathematical Modelling of Weld Phenomena [1] This paper was first presented at the Sixth International Seminar on the Numerical Analysis of Weldability, held in October 2001 in Graz, Austria. [2] This paper is published within Section I. Melt Pool, Phenomena, Chapter 5. lase welding, plates Q Science > QA Mathematics > QA76 Computer softwareT Technology > TJ Mechanical engineering and machinery School of Computing & Mathematical SciencesSchool of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process AnalysisSchool of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability GroupSchool of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering GroupSchool of Computing & Mathematical Sciences > Department of Computer Systems TechnologySchool of Computing & Mathematical Sciences > Department of Mathematical Sciences 02 Mar 2019 15:50 http://gala.gre.ac.uk/id/eprint/553