Study the Effect of Welding Current and Time on The Microstructure and Strength of Dissimilar Weld Joint AISI 303/AISI 1008


The welding of metals is one of the most important processes that require high control for obtaining a good quality of weldments. Joining of dissimilar metals is a more complex operation compared to joining of similar metals due to the differences in physical, metallurgical and mechanical properties. In this article, austenitic stainless steel AISI 303 studs were welded to low carbon steel AISI 1008 plate using arc stud welding (ASW) process. An experimental procedure was applied to estimate the effect of welding parameters namely welding current and welding time on microstructure and mechanical properties of the joint. The optical microscope was used to show microstructure properties while both the micro-Vickers Hardness and tensile test were adopted to evaluate the mechanical properties. The results revealed that the presence of carbides at the fusion zone FZ towards AISI 303 leads to the maximum value of hardness (501) HV. The best welding parameters were 600 AMP 0.25 second at which joint tensile strength of 515 MPa was recorded. Welding time was the effective parameter in the ASW process followed by welding current, proper selection of welding time and welding current produces good joint quality.