The effects of different types of welding current and electrode pressure on tensile shear properties of resistance spot welding (RSW) of commercial DP600 steel have been investigated in this study. In tensile shear tests of the welded joints, tensile shear force and maximum displacement were utilized to characterize the performance of the welding process. Nugget diameter has been measured to create a clear definition of RSW physical properties. Experimental results show that tensile shear load bearing capacity increases as the electrode pressure increases. Low current value occurs at low and at high electrode pressures. During high current value, the material can exhibit superior mechanical properties. The effect of electrode pressure on tensile shear load bearing capacity increases as welding current increases.