Abstract
The weld-nugget size is the key issue in determining the mechanical properties of resistance spot welds. This paper aims at investigating the weld-nugget growth of dissimilar-resistance spot welding of ferrite-martensite DP600 and drawing-quality special-killed (DQSK) low-carbon steel. It was revealed how the weld-nugget size is influenced by the main welding parameters: welding current, welding time and electrode force. The weldability lobe was established and proper welding conditions for the welds with a sufficient size and without an expulsion were determined. Using the experimental data, an empirical relationship between the weld-nugget size and the welding parameters was developed.
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