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An investigation on residual stresses in gas tungsten arc welding
Author(s) -
Ali Baharin Rahim Ali,
Nguyen An Danh,
Markert Bernd
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800304
Subject(s) - gas tungsten arc welding , marangoni effect , residual stress , materials science , finite element method , welding , weld pool , mechanics , temperature gradient , tungsten , surface tension , metallurgy , arc welding , work (physics) , porosity , fluid dynamics , composite material , mechanical engineering , thermodynamics , structural engineering , engineering , physics , quantum mechanics
It is known that the gas tungsten arc welding (GTAW) generates high and localised heat gradients in the welded components, leading to the formation of weld bead and residual stresses that affect their fatigue life. In this work, a finite element model of GTAW is presented to estimate the temperature and stress induced by GTAW. The heat and fluid flow (HFF) approach using the enthalpy‐porosity model and the finite element multiphase modelling allows us to simulate the rapid melting and solidification. Moreover, the Marangoni effect, due to a thermally caused surface tension gradient, is also studied. The performance of the proposed finite element model is demonstrated via a simulation of the GTAW process with appropriate boundary conditions on temperature and velocity fields. The model can be extended for further residual stress and distortion analyses.