Effect of Welding Parameters on Weld Bead Geometry in MIG Welding of Low Carbon Steel

摘要

In the present investigation, IS2062 was used, being one of the important grades of steel for laying beads, by the deposition of MW1 wire. Automatic gas metal arc welding (GMAW) was used for welding. The mixture of 80% Argon, 18% Carbon Dioxide and 2% Oxygen was used as shielding gas, to make beads, with fewer defects and economical also. The variations of the welding parameters like welding speed, voltage and gas flow rate were observed on the parameters of weld bead geometry like penetration, width, and height and percentage dilution. Mathematical equations were developed using factorial technique. The models developed were checked for their adequacy and significance, by using F-test and t-test, respectively. Main and interaction effects of the control factors on bead geometry were plotted to depict the process parameters to achieve the desired quality of overlay. It was observed that arc voltage, welding speed has remarkable effect on the bead geometry parameters but gas flow rate does not have much effect on them.