Optimizing Of Hold-Time Of Spot Welded Joints On Low Carbon Steel (Astm A36)

Abstract

This study investigates the relationship between hold time and tensile strength in spot welded mild steel. The aim is to determine the optimal hold time that maximizes the mechanical properties of spot-welded joints. A series of spot welds were performed on mild steel samples using a constant welding current, electrode force, and other standard welding parameters. The hold time was varied from 50 to 90 cycles, while all other parameters were kept constant. Tensile tests were conducted on the spot-welded samples to determine their ultimate tensile strength. The results indicate a positive correlation between hold time and ultimate tensile strength. As the hold time increased from 50 to 90 cycles, there was a noticeable increase in the ultimate tensile strength of the spot-welded joints. This suggests that longer hold times during spot welding have the potential to enhance the material’s resistance to breaking under tension. However, it is important to note that other parameters, such as welding current, electrode force, and electrode material, may also influence the mechanical properties of spot-welded mild steel. Further research is needed to investigate the combined effects of these parameters and their optimal values for achieving desired mechanical properties. The findings of this study contribute to the understanding of the relationship between hold time and tensile strength in spot welding of mild steel. The results can guide future research and industrial applications, aiding in the development of optimized welding processes and joints with improved mechanical performance.