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A sound weld from spot welding is what most of the manufacturers desired and preferred for mechanical assemblies in their systems. The robustness is mainly relied on the joining mechanism of mechanical parts. This paper focuses on the effect of parametric changes for dissimilar joints using 304 austenitic stainless steel and carbon steel with two different thicknesses. The pneumatic based spot welder was used to accomplish the entire welding process. The parameters varied throughout the experiments are the welding current and welding time while the electrode pressing force and electrode tips size are kept constant. The welding process was started from poor weld and move on to better weldment by increasing the process parameters. However, this study is limited to the basic parametric variation to find optimum parametric set up for 1 mm and 2 mm base metals. The welded specimens are later undergone the tensile test, hardness test and metallurgical test to characterize the spot weld growth for both thicknesses.

Characterization of Spot Weld Growth on Dissimilar Joints with Different Thicknesses