Title: A nonlinear coupled-variables model for mass transfer modes in MIG-MAG processes with experimental validation

Authors: Paulo Jefferson Dias De Oliveira Evald; Jusoan Lang Mór; Rodrigo Zelir Azzolin; Silvia Silva Da Costa Botelho

Addresses: Computer Science Centre, Group of Robotics and Intelligent Automation, Federal University of Rio Grande, Av. Itália, Km 8, 96203-900, Rio Grande, Brazil ' Computer Science Centre, Group of Robotics and Intelligent Automation, Federal University of Rio Grande, Av. Itália, Km 8, 96203-900, Rio Grande, Brazil ' Computer Science Centre, Group of Robotics and Intelligent Automation, Federal University of Rio Grande, Av. Itália, Km 8, 96203-900, Rio Grande, Brazil ' Computer Science Centre, Group of Robotics and Intelligent Automation, Federal University of Rio Grande, Av. Itália, Km 8, 96203-900, Rio Grande, Brazil

Abstract: Welding processes have relevant importance in many areas of industry, especially in the manufacturing area. The choice of mass transfer mode, to weld metal plates, depends on workpiece structure and its sensibility to the heat input and necessity for material deposition rate. Then, aiming at the mass transfer modes in metal inert gas-metal active gas (MIG-MAG) processes utilising pure CO₂ as shielding gas, the objective of this paper is to present a detailed mathematical modelling for globular and short-circuit transfer modes. The proposed models cover a large set of process dynamics, approximating the simulated dynamics very closely to the physical process, which give a high level of credibility for the models. Furthermore, simulations and experimental data are presented to corroborate the validation of both models.

Keywords: nonlinear systems; time-varying systems; coupled-parameters systems; uncertain systems; gas metal arc welding process; GMAW.

DOI: 10.1504/IJMIC.2019.099813

International Journal of Modelling, Identification and Control, 2019 Vol.31 No.4, pp.361 - 373

Received: 08 May 2017
Accepted: 21 Aug 2017
Published online: 23 May 2019 *

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