Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
A THERMAL EFFICIENCY ANALISYS OF GTAW PROCESS IN STAINLESS STEEL
Submission Author:
Elisan dos Santos Magalhães , SP , Brazil
Co-Authors:
Ana Silva, Sandro Metrevelle Marcondes de Lima e Silva
Presenter: Elisan dos Santos Magalhães
doi://10.26678/ABCM.ENCIT2016.CIT2016-0661
Abstract
This work presents a global model to determine the time dependent thermal efficiency in a GTAW process. With the purpose of estimating the amount of heat delivered by the GTAW torch, a previously developed homemade C++ code was improved. The new model proposes the heat flux estimation through the Golden Section optimization with Temperature Moving Sensor technique. An innovative methodology based on Time Traveling concept is proposed to regularize the Golden Section technique. In order to test the capacity of the model to adapt to a range of conditions, a set of lab-controlled experiments were performed under different welding conditions based on a Robust Project matrix (Taguchi). The objective function was determined based on to the fourth power between the experimental and the calculated values. Moreover, the work also presents an analysis of the cooling rate of the process by convection and radiation. An empirical correlation based on the local Nusselt number for flat plates was used to estimate the local heat transfer coefficient. The proposed model proved to be a first-class method to determine the thermal efficiency in a welding process.
Keywords
Inverse problems, Heat flux, Temperature estimation, GTAW process, Free convection, Thermal Efficiency, Inverse problems, Heat flux, Temperature estimation, GTAW process, Free convection, Thermal Efficiency
