The resistance spot welding of dissimilar materials is generally more challenging than that of similar materials
due to differences in the physical, chemical and mechanical properties of the base metals. The influence of the primary
welding parameters affecting the heat input such as; peak current on the morphology, micro hardness, and tensile shear
load bearing capacity of dissimilar welds between Low Carbon steel and 304LSS joints and LCS-Cu-304LS joints
investigated in this study. This study has been done in two stages: First, welding LCS -304LSS in weld parameters
changed, after addition Copper sheet between LCS and 304LSS sheets in Optimum Parameters (8KA welding current,
20Cycle weld time and15.6N) force of electrode. Results shown that the increasing in Weld current, weld time and force of
electrode led to increase of the mechanical properties for joints and the addition Copper layer between LCS and 304LSS
led to reduce the mechanical properties for joints such as (the Maximum Load and Hardness)and the failure mode changed
from pullout in LCS-304LSSjoints to Interfacial mode for LCS-Cu-304LSSjoints .