In the light of results obtained from diagrams, increasing welding times cause high heat input to weld zone and extending weld nugget, so the tensile-shear strength of joints increases (Fig. 6). It increases from 7 kA to 10 kA in five period welding times. In 10 and 12 periods, tensile-shear strengths of specimens increase sharply up to 8 kA and then this increment continues with a lower rate. The maximum values of it were obtained in 10–11 kA, then its values were started to decreasing from this point