Cross tensile and fatigue tests had been conducted using zinc-galvanized low carbon steel wire (SWRM6) resistance cross welded joints. The jig for cross tensile and fatigue strengths evaluation was newly designed. Two kinds of cross-welded joints were used in the present study. As-received galvanized wire was resistance welded into the Joint A. On the other hand, the wire was aged in laboratory air at ambient temperature for 6 months and welded as the Joint B to evaluate the effect of time-dependent change of the surface condition on mechanical properties. The hardness of heat affected zone (HAZ) was the lowest due to the grain coarsening and annealing. Difference of cross tensile and fatigue strengths was not clearly recognized between Joints A and B. However, one sample in Joint B showed the decrease in cross tensile strength due to the unsound welding. In the cross tensile tests, fracture occurred at HAZ in both Joints A and B, where the hardness was the lowest. In the cross tension fatigue tests, fatigue cracks initiated at HAZ, and propagated through the wire until final fracture.