A Coupled Thermal-Structural Model for Welding of Aluminium Alloy Sheets
Computational simulations using the finite element method are advantageous in predicting the response of the weldments during the welding processes. These welding simulations help in ensuring the correction in the process design to compensate for the effects of the welding before the commencement of the actual fabrication process. In this work, a coupled thermo-mechanical finite element model is presented for simulating the gas metal arc welding process on thin aluminium alloy plates. For modelling the thermal and mechanical behaviour of the weldments, finite element ANSYS software is used. Temperature-dependent properties of plates are used in the simulation. Effects of conduction and convection due to air and argon gas are considered. For modelling the welding heat source, Goldak’s double ellipsoidal heat flux distribution is implemented. With the help of finite element solutions, transient temperature and transient stress distribution in aluminium alloy weldments are estimated.
KeywordsAluminium alloy (AA) Finite element modelling (FEM) Heat-affected zone (HAZ)
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