Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Optimization of Heat Source Parameters in Numerical Simulations of the GTAW Welding Process of AISI 304 Butt Joints
Submission Author:
Rodrigo Martins Farias , SP , Brazil
Co-Authors:
Rodrigo Martins Farias, Paulo Teixeira, Louriel Vilarinho
Presenter: Rodrigo Martins Farias
doi://10.26678/ABCM.COBEM2019.COB2019-0818
Abstract
Welding processes involve complex physical and chemical phenomena, which make mathematical modelling difficult. Several types of heat sources are available to be used in numerical simulations of welding processes. However, to get accuracy, some heat sources have many geometry parameters to be set and they demand much computational time, even using optimization methodologies. In this paper, a welding numerical analysis of a single pass butt joint weld, with square groove, of AISI 304 stainless steel, using the autogenous GTAW process is shown. The plates are 150x50x3.2 mm. Numerical simulations were performed in ANSYS Multiphysics software, considering three types of heat sources distributions (Gaussian, Conical and Double Ellipsoid). The fusion zone shapes and thermal cycles of the plates, obtained from the experiments developed at the Laboratory of Research in Welding Processes (LAPROSOLDA – UFU), are compared with numerical results. This data, obtained by macrography and thermocouples, were used by a new optimization methodology to find the optimal parameters for these heat sources, by using the inverse problem approach and Genetic Algorithm method. Analyses of the computational time and accuracy in relation to experiments were carried out. In general, thermal results obtained by numerical simulation show good agreement with experiments. Thus, the proposed methodology strongly decreases the computational time.
Keywords
Optimization, heat source, welding, Numerical simulation, reduced geometry
