Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Analysis of the addition of a non-energized wire under gas mixed protection in gas metal arc welding (GMAW)
Submission Author:
Thiago Geraldi , MG
Co-Authors:
Thiago Geraldi, Deborah Santos, Leonel Abreu Dimas
Presenter: Deborah Santos
doi://10.26678/ABCM.COBEM2019.COB2019-1238
Abstract
Nowadays, Gas Metal Arc Welding (GMAW), is widely used and one of the most important metal welding processes, characterized by continuous wire feed and shielding gas in the molten pool. In order to improve the conventional MAG (Metal Active Gas) welding process, a non-energized and shielded gaseous cold wire was added using a slave torch. The cold wire, also under gaseous protection, was added to the molten pool formed by the electric arc established by the energized wire fed by the main torch. The gas also influences on the transfer of the addition metal through the electric arc, as in its stability and the characteristic form of the weld bead. The metallic transfer mode is spraying metal, due the welding parameters and the slave torch position. For a behavioral analysis of the arc formed by both energized and cold wires and the influence of the respective mix of gasses in the molten pool, it was used synchronized filming, and data acquisition equipment receiving voltage and current signals. The results show stability of the electric arc and improvement in deposition rate and penetration profile when compared to the traditional process.
Keywords
Cold wire, Gas Metal Arc Welding, shielding gas, doube wire, active gas, CO2
