Optimization of Gmaw Welding Parameters for Micro-Alloyed A572 Gr.50 Steel

Abstract

Gas metal arc welding (GMAW) is a simple process due to which it is mostly automated, and hence once welding parameters are established, it is possible to produce long and repeatable welds. Mechanical/material properties around heat affected zone (HAZ) are greatly influenced by the welding parameters. In the present study, emphasis was to observe the weld bead variations, morphology and weld microstructure with respect to different current and travel speed combinations under the same heat input. The results revealed that combination of parameters had significant effect on microstructural feature of welded structure and hence weld strength. Through Taguchi approach optimum parameters were established for the welding and the performance corresponding to this were observed in terms of microstructure, hardness and strength.