Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Effects of the GTAW Triple electrode process on autogenous welding of carbon steel
Submission Author:
Tiago Ballmann de Campos , SC , Brazil
Co-Authors:
Tiago Ballmann de Campos, Alisson Fernandes da Rosa, Emanuel Silva da Rosa, Mateus Barancelli Schwedersky, Regis Henrique Goncalves e Silva
Presenter: Tiago Ballmann de Campos
doi://10.26678/ABCM.COBEM2023.COB2023-2396
Abstract
The GTAW (Gas Tungsten Arc Welding) is a process that uses an electric arc between a non-consumable electrode and the piece to be welded. Despite being widely used and making a high quality finish, the conventional method using pure argon is often labeled as low productive. As the travel speed increases, so must the current, therefore the generation of defects such as humping is imminent. Thus, some versions of GTAW uses more than one electrode as an alternative to minimize the humping effect, such as the present study, which uses a version with three tungsten electrodes in a triangular arrangement. To characterize multielectrode welding, this study does an overall analysis of the process, in which were performed autogenous over plate welding tests with 1, 2 and 3 electrodes, respectively. In addition, the performance of the process was evaluated under three different welding speeds, reaching up to 1,5m/min welding speed on every tested condition. The penetration and microhardness profiles were also evaluated. The results show that the use of multiple electrodes is, in fact, effective in reducing humping. A considerable decrease on the penetration values was also identified, especially for higher welding speeds. Moreover, it was possible to validate the experimental equipment (welding torch) for triple electrode welding, extending the application range of TIG welding. Thus, the present work shows that the use of TIG can be diverse, and even more, considering the number of electrodes. The process using three electrodes, which showed the lowest penetration, for example, has potential for coating applications or welding thin plates, where these characteristics are highly desired.
Keywords
TIG, multicathode, travel speed, humping
