Resistance spot welding (RSW) welding is a method of connecting metal material by means of the plate surface being pressed together between the electrodes and at the same time a current is flowed so that the metal surface becomes hot and melts. The study aims to determine the ability of welded joints to microstructure, tensile strength and hardness of weld joint results. The research uses welding time variation parameters that are 2 seconds, 3 seconds and 4 seconds with a constant voltage of 2.02 V. while the material used is stainless steel AISI 304 and high carbon steel SK 5 with a thickness of 1 mm each plate. each plate is cut to 80 mm in size and 25 mm wide. then arranged overlapping with the position of high carbon steel SK 5 at the top. The results showed that the longer the welding time used, it increased the diameter of the nugget. While the results of the tensile test show that the longer the time used the shear tensile strength has increased, but in the time variation of 3 seconds to 4 seconds the tensile load strength has decreased. The highest shear tensile load capacity is 5260 N. Observation of the microstructure at the dissimilar welded point joints between AISI 304 stainless steel and high carbon steelSK 5 shows the phase difference between base metal, weld metal, and HAZ. Where in the weld metal area there are austenite and perlite type structures. The highest hardness value is found in the HAZ area of high carbon steel SK 5 of ± 586 HV, due to the high carbon steel nature which has a high hardness value compared to other metals and is distributed with heat welding. From the research conducted welding time variation parameters affect the value of the tensile load capacity, hardness value, and microstructure.