Welding behaviour, microstructure and mechanical properties of dissimilar resistance spot welds between galvannealed HSLA350 and DP600 steels
Authors: Khan, M.S.1; Bhole, S.D.2; Chen, D.L.1; Biro, E.3; Boudreau, G.3; van Deventer, J.3
Source: Science and Technology of Welding & Joining, Volume 14, Number 7, October 2009 , pp. 616-625(10)
Publisher: Maney Publishing
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Abstract:
Resistance spot welding experiments were conducted on dissimilar material combination of HSLA350/DP600 steels. The welds were characterised using optical and scanning electron microscopy. The fusion zone of the dissimilar material spot weld was predominantly martensitic with some bainite. Mechanical properties were also determined by tensile shear, cross tension and fatigue tests. The performance of dissimilar material spot weld was different from that of the similar ones in each of the HSLA350 and DP600 steels and exhibited different heat affected zone hardness. The DP600 weld properties played a dominating role in the microstructure and tensile properties of the dissimilar material spot welds. However, the fatigue performance of the dissimilar welds was similar to that of the HSLA350 welds. Fatigue tests on the dissimilar material spot welds showed that the 5·5 mm diameter nugget exhibited higher fatigue strength than the 7·5 mm diameter nugget.Keywords: SPOT WELDING; DISSIMILAR MATERIALS; TENSILE PROPERTIES; FATIGUE
Document Type: Research article
DOI: 10.1179/136217109X12464549883295
Affiliations: 1: Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada 2: Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada;, Email: sdbhole@ryerson.ca 3: ArcelorMittal Dofasco Inc., Box 2460, Hamilton, Ontario L8N 3J5, Canada
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