Journal
CANADIAN METALLURGICAL QUARTERLY
Volume 50, Issue 4, Pages 381-388Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1879139511Y.0000000008
Keywords
Resistance spot weld; Dual phase steel; Mechanical properties; Failure mode; Dissimilar welding
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This paper addresses the mechanical performance of dissimilar resistance spot welds between DP600 and AISI 1008 low carbon steels. The weldability lobe was established and proper welding conditions to produce welds with sufficient size and without expulsion were determined. Correlations among the process parameters (welding current and welding time), physical spot weld attributes (fusion zone size and electrode indentation depth) and mechanical performance (peak load and energy absorption) were analysed. It was shown that the increases in welding current and welding time result in increases in fusion zone size and electrode indentation depth. In the low heat input welding condition, welds failed in interfacial failure mode. Increasing welding heat input results in sufficient weld size and promotes pullout failure mode with improved mechanical properties in terms of peak load and failure energy. However, a further increase in heat input caused metal expulsion and the failure mode was changed to partial pullout-partial thickness mode with reduced energy absorption capability.
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