The effect of current gouging arc welding analysis of A283 Gr C steel to the tensile strength, hardness and microstructure

Abstract

The research has been done to investigate the effect of gouging welding currents that tensile strength, hardness and microstructure welding A283 GrC steel. Variations of gouging current 200 A, 300 A and 400 A were compared with welding without gouging. Seam type used is a double V joint with angle 600 and in using SMAW welding process. The test results are the highest tensile strength of 45.98 kgf/mm2 at 300A gouging current and the lowest yield 45.51 kgf/mm2 in welding without gouging. It shows the process of gouging reduce the ductility of the material due to the higher heat input. The fracture mechanism is more apt to occur in the current 300A gouging with the strain of 32.96% when compared to the non-gouging welding with a strain of 36.21%. The highest test result is 51 HRC on gouging current 400 A weld metal and the lowest area is 33.33 HRC on without gouging welding base metal regions. The results of microstructure observation showed that the increasing flow of gouging or heat input then occurs coarsening of grain or grains formed larger influence the outcome of toughness and hardness.