Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-25T21:03:05Z No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-27T19:21:27Z (GMT) No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) / Made available in DSpace on 2016-04-27T19:21:27Z (GMT). No. of bitstreams: 1 TadeuFelixDosSantos_DISSERT.pdf: 1188872 bytes, checksum: 47b34679279af1fc33a4e33479484fde (MD5) Previous issue date: 2015-09-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este estudo oferece uma abordagem anal??tica que visa determinar o campo de temperaturas desenvolvido durante a soldagem TIG DC sobre uma placa fina de Alum??nio. As caracter??sticas n?ao-lineares do fen?omeno, tais como a depend?encia das propriedades termof??sicas e mec?anicas do material com a temperatura, s?ao consideradas nesse estudo. Al?em do processo de troca de calor por condu?c?ao, s?ao levadas em considera?c?ao as trocas por convec?c?ao natural e radia?c?ao. Uma an?alise transiente foi realizada a fim de se avaliar o comportamento temporal do campo de temperatura. Tamb?em uma modelagem tridimensional para a fonte de calor foi discutida. Com a finalidade de validar os resultados obtidos atrav?es do modelo anal??tico, foi feito o confronto destes com aqueles obtidos experimentalmente e os dispon??veis na literatura. As respostas anal??ticas obtidas apresentam uma boa correla?c?ao com as experimentais dispon??veis na literatura, comprovando assim a viabilidade e efici?encia deste m?etodo anal??tico na simula?c?ao do ciclo t?ermico para este tipo de soldagem. / This study offers an analytical approach in order to provide a determination of the temperature field developed during the DC TIG welding of a thin plate of aluminum. The non-linear characteristics of the phenomenon, such as the dependence of the thermophysical and mechanical properties with temperature were considered in this study. In addition to the conductive heat exchange process, were taken into account the exchange by natural convection and radiation. A transient analysis is performed in order to obtain the temperature field as a function of time. It is also discussed a three-dimensional modeling of the heat source. The results obtained from the analytical model were be compared with the experimental ones and those available in the literature. The analytical results show a good correlation with the experimental ones available in the literature, thus proving the feasibility and efficiency of the analytical method for the simulation of the heat cycle for this welding process.