This paper presents an experimental study on the resistance spot weldability of galvanized Interstitial Free (cold formable) steel sheets with austenitic stainless steel sheets. Galvanized IF and austenitic stainless steel sheets were joined by using resistance spot welding as lap joint. Firstly, the variation of the Nugget diameter according to welding current was investigated. Tensile-shear tests were applied to the welded specimens Also, the form and diameter of the Nuggets were investigated as macroscopically. The effect of the welding parameters on the microhardness distribution was investigated. The high cycle fatigue tests were performed each welded specimens and S-N curves for each specimens were obtained. The results were discussed and plotted as graphs and figures. (C) 2004 Elsevier B.V. All rights reserved.