Publications

Abstract : In the welding of thick steel components, residual stresses have a significant role in deteriorating the quality of the weld joints because they contribute to fatigue crack development in a structure. This paper focuses on the investigations of the influence of welding parameters such as welding input current, gas flow, and torch nozzle-to-plate distance on ultimate tensile strength (UTS), hardness (HV), grain distribution, and residual stress in MIG welding of dissimilar metals. MIG welding of AISI 409, ferritic stainless steel to AISI 316L, austenitic stainless steel by using AISI 308 filler wire at three different temperature conditions, viz., pre-heat, post-heat, and freezing, was carried out. Butt joints were formed as per L9 orthogonal array, and the weld quality has been evaluated. The results revealed that under post-heat conditions, relatively lower deformation occurs with a 3% increase in UTS than under pre-heat and freezing conditions. Further, the influence of process parameters on the weld bead characteristics has been investigated.