Investigation of the Effect of Protective Gas Composition on Welding Quality in Mag Welding by Tensile Test

Abstract

MAG (Metal Active Gas) welding method is widely used in joining structural steels. In this research, S355J2+N structural steel was welded with MAG welding method in the semi-automatic welding mechanism created for the welding process. In order to observe the effect of different shielding gas compositions and different welding speeds used during welding on the welding quality, a total of 27 welded parts were obtained by using 9 gas mixtures and 3 speed values. The samples obtained from the welded parts were examined by performing tensile tests. As a result of this study, it was observed that the tensile strength decreased as the amount of CO2 increased while the O2 was constant in the shielding gas, or as the amount of O2 increased while the CO2 was constant. It has been observed that the welding speed and therefore the number of passes also affect the tensile strength.