Evaluation of wire quality for GMAW welding of low-alloyed structural steels

Abstract

Gas Metal Arc Welding is a widely used joining process for low-alloyed structural steels. Its performance depends not only on process parameters but also on the quality of the filler metal, i.e. wire. This paper presents results of experimental research made using wires with the same designation and diameter, made by three different manufacturers. To avoid any bias, wires are designated just as Wire 1, Wire 2 and Wire 3. Welds have been made independently by two welders using the same sets of parameters, in order to achieve different types of metal transfer. Arc characteristics and noise levels have been recorded during welding, while visual inspection and macro examination of welds, together with spatter evaluation, have been made afterwards. In addition, chemical analysis of weld metal has been made, and welders provided their subjective opinions regarding wire performance. The results have been analysed, and findings indicate that there is no significant difference among wires, except in spatter quantity and penetration.