Abstract
The aim of this paper is to investigate the correlations between the weld macrostructure, the microstructure, failure mode and the mechanical properties (peak load and energy absorption) of dissimilar low carbon steel/dual phase steel (DP600) resistance spot weld. Three distinct failure modes were observed during tensile‐shear test: interfacial, pullout and partial thickness‐partial pullout failure mode. Results showed that before expulsion, there was a direct relationship between FZ size and mechanical properties. However, on expulsion, peak load and particularly energy absorption were significantly reduced. The reduction of the failure energy was related to PT‐PP failure mode. For similar weld size, peak load and energy absorption of the spot welds in PT‐PP failure mode was significantly lower than PF mode.
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