Fatigue Performance of Advanced High-Strength Steels (AHSS) GMAW Joints

2009-01-0256

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
The fatigue performance of gas metal arc welding (GMAW) joints of advanced high strength steels (AHSS) are compared and analyzed. The steel studied included a number of different grades of AHSS and baseline mild steels: DP600, DP780, DP980, M130, M220, solution annealed boron steel, fully hardened boron steels, HSLA690 and DR210 (a mild steel). Fatigue testing was conducted under a number of nominal stress ranges to obtain the S/N curves of the weld joints. A two-phase analytical model is developed to predict the fatigue performance of AHSS welds.
It was found that there are appreciable differences in the fatigue S/N curves among different AHSS joints made using the same welding practices, suggesting that the local microstructure in the weld toe and root region plays non-negligible role in the fatigue performance of AHSS welds. Changes in weld parameters can influence the joint characteristics which in turn influence fatigue lifes of the weld joints, particularly of those of higher strength AHSS. The analytical model is capable of reasonably predicting the fatigue performance of welds made with various steel grades in this study.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-0256
Pages
8
Citation
Feng, Z., Sang, Y., Jiang, C., Chiang, J. et al., "Fatigue Performance of Advanced High-Strength Steels (AHSS) GMAW Joints," SAE Technical Paper 2009-01-0256, 2009, https://doi.org/10.4271/2009-01-0256.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-0256
Content Type
Technical Paper
Language
English