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Appl. Sci. 2017, 7(2), 122; doi:10.3390/app7020122

A GTA Welding Cooling Rate Analysis on Stainless Steel and Aluminum Using Inverse Problems

Heat Transfer Laboratory—LabTC, Institute of Mechanical Engineering—IEM, Federal University of Itajubá—UNIFEI, Campus Prof. José Rodrigues Seabra, Av. BPS, 1303, 37500-903 Itajubá, MG, Brazil
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Author to whom correspondence should be addressed.
Academic Editors: Hai-Lung Tsai and Junling Hu
Received: 14 December 2016 / Revised: 10 January 2017 / Accepted: 12 January 2017 / Published: 25 January 2017
(This article belongs to the Special Issue Gas Tungsten Arc Welding)
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Abstract

This work presents an analysis of the thermal influence of the heat transfer by convection and radiation during GTA (gas tungsten arc) welding process. The authors’ in-house C++ previously-developed code was modified to calculate the amount of heat transfer by convection and radiation. In this software, an iterative Broydon-Fletcher-Goldfarb-Shanno (BFGS) inverse method was applied to estimate the amount of heat delivered to the plate when the appropriate sensitivity criteria were defined. The methodology was validated by accomplishing lab-controlled experiments on stainless steel AISI 304L and aluminum 6065 T5 plates. Due to some experimental singularities, the forced thermal convection induced by the electromagnetic field and thermal-capillary force were disregarded. Significant examples of these singularities are the relatively small weld bead when compared to the sample size and the reduced time of the welding process. In order to evaluate the local Nusselt number, empirical correlations for flat plates were used. The thermal emission was a dominant cooling effect on the aluminum cooling. However, it did not present the same behavior as the stainless steel samples. The study found that the heat losses by convection and radiation of the weld pool do not affect the cooling process significantly. View Full-Text
Keywords: inverse problems; heat flux estimation; thermal analysis; cooling and heating rate; radiation inverse problems; heat flux estimation; thermal analysis; cooling and heating rate; radiation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Magalhaes, E.S.; Lima e Silva, A.L.F.; Lima e Silva, S.M.M. A GTA Welding Cooling Rate Analysis on Stainless Steel and Aluminum Using Inverse Problems. Appl. Sci. 2017, 7, 122.

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