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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)


Solidonio Rodrigues de Carvalho
Federal University of Uberlândia, Uberlândia, Brazil

Sandro Metrevelle Marcondes de Lima e Silva
Federal University of Itajuba - UNIFEI, Institute of Mechanical Engineering - IEM, Prof. Jose Rodrigues Seabra Campus, 1303 BPS Av, Pinheirinho District, 37500-903, Box-Postal 50, Itajuba, Minas Gerais, Brazil

Gilmar Guimaraes

DOI: 10.1615/IHTC13.p13.20
12 pages


Gas tungsten arc welding (GTAW) is a welding process that takes place in an atmosphere of inert gas and uses a tungsten electrode. In this process the heat input identification is a complex task and represents an important rule in the optimization of the welding process. The aim of this work is to investigate both the temperature field and the heat flux delivered to a workpiece of aluminum 6060-T5 during a GTAW. The technique used to estimate the heat flux is based on solution of inverse heat conduction problem. It means a square error function that is based on the difference of theoretical and experimental temperature is minimized. The temperature measurements are obtained by using thermocouples on accessible regions of the workpiece surface while the theoretical temperatures are calculated from a 3D transient thermal model. A great difficulty that appears in such experiments is the presence of high level of noise in contrast of the low signal of tension from thermocouple measurements. The technique presented here proposes to recover the heat flux using just signals of thermocouple after the action of the tungsten electrode. The methodology shows to be efficient in the heat flux and field temperature identification.

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Measurement of fluid temperature with an arrangement of three thermocouples