期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 23, 期 8, 页码 649-658出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2018.1452875
关键词
Dual-phase steel; resistance spot welding; cross-tension test; orientation imaging microscopy; residual stress
资金
- Partnership Program of the Materials innovation institute M2i [T22.7.13508]
In the present study, the effect of resistance spot welding scheme (i.e. single and double pulse welding) on the mechanical behaviour of resistance spot-welded DP1000-GI steel is investigated. It is shown that double pulse welding at low welding current decreases the maximum cross-tension strength and mechanical energy absorption capability of the welds. The factors that lead to the lower mechanical performance of double pulse welds are scrutinised. Local residual stress mapping reveals that the compressive residual stress perpendicular to the plane of the pre-crack either decreases or is fully released at the weld edge of double pulse welds. Orientation imaging microscopy analyses show that the martensite formed in front of the pre-crack of double pulse weld has a lower fraction of high-angle grain boundaries and a coarser structure of Bain groups as opposed to the corresponding area of single pulse weld. Lower mechanical performance of double pulse welds produced at lower welding current is ascribed to the lower compressive residual stress normal to the plane of crack and the formation of martensitic structure in front of the pre-crack with a lower fraction of high-angle grain boundaries and coarser Bain groups.
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