Study of the effect of welding current on the mechanical properties of materials welded by resistance spot welding

Abstract

Resistance spot welding of dissimilar materials is more difficult than welding similar materials due to the different physical, chemical, and mechanical properties of the base metals. This study investigated the influence of key welding parameters, such as peak current, on the shape, microhardness, and tensile shear stress-bearing capacity of different welds when welding low-carbon steel with high-strength low-alloy (HSLA) steel. This study was conducted using only a variable welding current, while keeping other parameters constant. The bearing capacity, hardness, and weld nugget size of the material exhibited a linear relationship with the welding current, and the weldability of low-carbon steel with HSLA steel was found to be satisfactory. At a welding current of 8 kJ, the bearing capacity exhibited a maximum value (in kgf) of 217