Effect of Electrode Diameter and Current on Dissimilar Metal Welding (Stainless Steel - Galvanized Steel) in Bus Body Construction: Microstructure and Properties Evaluation

This study evaluates the macrostructure, microstructure, hardness, and tensile strength in dissimilar metal welding applied to bus body construction. The process involved joining hollow stainless steel galvanized at dimensions of 80 x 40 3.2 mm through Gas Metal Arc Welding (GMAW). current was varied 90, 100, 110 A while ER70S-6 electrodes with diameters 0.8 1.0 were used. results showed that electrode diameter affect capping area, penetration depth, hardness. Moreover, formation widmasatten ferrite phase increased coarse grain boundaries weld zone detected. It also observed an increase which indicates increment heat reduced rate solidification cooling. average for all samples investigated found be lower than value base metal. Therefore, further research is recommended improve strength.