Welding of comparatively thick (4 mm)C-Mn-Cr-Mo dual phase steel has beencarried out by ~esistance spot welding process.Weldability of this steel has been studied by varying the electrode force and the primary welding parameters affecting the heat input such as the eftective current and weld time.The influence of these welding parameters on the morphology, microhardness and the tensile shear strength of the weldmentare investigated.Optimumwelding param- eters producing maximum joint strength are established as electrode force of 61 5 kg, effective current of 6 kA and weld time of 80 cycle.Weakening of weldmentcaused by excess tempering of martensite at the outer region of HAZwas not observed in the range of optimumwelding conditions.
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Ghosh et al. (1990) studied this question.