Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
COMSOL WITH MODIFIED NONLINEAR FUNCTION SPECIFICATION AND TEMPERATURE MOVING SENSOR TO ESTIMATE HEAT RATE IN A TIG WELDING PROCESS
Submission Author:
Sandro Metrevelle Marcondes de Lima e Silva , MG , Brazil
Co-Authors:
Rodrigo Gustavo Dourado da Silva, Elisan dos Santos Magalhães, Sandro Metrevelle Marcondes de Lima e Silva
Presenter: Rodrigo Gustavo Dourado da Silva
doi://10.26678/ABCM.COBEM2021.COB2021-0988
Abstract
The estimation of the imposed heat rate in welding processes has always been an obstacle to improve the thermal efficiency of these processes. Thus, the use of inverse problem techniques is an alternative procedure to estimate the heat rate. In this study, the problem is highly nonlinear; therefore, the heat flux provided by the welding process is estimated by the iterative Function Specification Method. This method was modified to estimate the heat supply based on the heat rate sensitivity coefficient, which represents the influence of the welding power in the temperatures of 304 stainless steel plates. In order to avoid the problem of low thermal sensitivity due to the movement of the welding source on the upper face of the plate, this methodology is based on the concept of temperature moving sensor. The software Comsol was used to solve the three-dimensional heat diffusion equation with enthalpy with phase change. The efficiency of the process was calculated with the estimated net heat rate which ranged from 63% to 87%. The average efficiency obtained was 75% for this welding process. A relation between the energy rate given by the power supply and the estimated efficiency was also observed.
Keywords
nonlinear function specification method, Inverse problems, heat rate estimation, TIG welding process, COMSOL
