Spot Weld Fatigue of Dual Phase Steels

2004-01-0511

03/08/2004

Event
SAE 2004 World Congress & Exhibition
Authors Abstract
Content
Spot weld fatigue performance of dual phase steels is of great interest due to much higher fatigue strength of its base steel. In this study, 0.8mm DP500-EG and 1.4mm DP600-GI were tested for both tensile shear and cross tension conditions. For comparison, tensile shear test was also conducted for 1.6mm HSLA350-GI and 0.8mm DQSK-GI. Although fatigue strength was different due to their different gages, by using the stress index, Ki, a parameter to describe the local stress condition, fatigue strength of all four steels merged to a narrow scatter band, indicating very little dependence of spot weld fatigue on the strength of the base steel.
In addition, the effect of weld surface cracking on fatigue strength of dual phase steels is of concern due to their high strength, despite the fact that it can occur to any steels under conditions of high current or electrode misalignment. In this work, the impact of weld surface cracking on fatigue performance is investigated by FEA simulation and experiments. Fatigue strength of spot welds exhibited excellent tolerance to weld surface cracking. No significant deterioration was observed when weld surface cracks are present.
Meta TagsDetails
DOI
https://doi.org/10.4271/2004-01-0511
Pages
10
Citation
Yan, B., Zhu, H., Lalam, S., Baczkowski, S. et al., "Spot Weld Fatigue of Dual Phase Steels," SAE Technical Paper 2004-01-0511, 2004, https://doi.org/10.4271/2004-01-0511.
Additional Details
Publisher
Published
Mar 8, 2004
Product Code
2004-01-0511
Content Type
Technical Paper
Language
English