Abstract
The effect of welding heat input on the fatigue life of a quenched boron steel and ferrite-bainite (FB) steel lap joint was investigated. Boron steel was quenched and welded with FB steel in heat input ranging from 0.29 to 0.67 kJ/mm. Boron, which can increase hardenability, affected the microstructure and hardness of the weld metal and heat affected zone (HAZ). The hardness of the weld metal and HAZ increased with decreasing welding heat input, and the high hardness of the weld metal and boron steel HAZ prevented the initiation of cracks in the stress concentration area around the bead. The bead width increased with increasing heat input, and the results of finite element method (FEM) showed that the maximum stress in the notch of the weld joint decreased when the bead width was increased. That is to say, the fatigue life increased when the weld joint had wider bead width. Finally, while the fatigue life was affected by the residual stress, the variation of the welding heat input used in this study had hardly any affect on the residual stress distribution.
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This paper was recommended for publication in revised form by Associate Editor Youngseog Lee
Chang Hee Suh received his B.S. and M.S. degrees in Mechanical Engineering from Kyungpook National University, Korea, in 1998 and 2001. He is a senior researcher at the Daegu Mechatronics & Materials Institute. His research interests include computational mechanics, material processing, and fracture mechanics.
Young Suk Kim is currently a professor, Department of Mechanical Engineering, Kyungpook National University in Daegu, Korea. He received his B.S. degree from Hanyang University in 1979 and M.S. degree from Seoul National University in 1981. He received his Ph.D degree from Kobe University, Japan, in 1986. Dr. Kim’s research interests include sustainable material processing, nano/micro mechanics, FEM and biomechanics.
Yun-Chul Jung received his B.S. degree from Donga University, Korea, in 1991. He received his M.S. and Ph.D degrees from Ehime University, Japan, in 1994 and 1997. He is a principal researcher at the Daegu Mechatronics & Materials Institute. His research interests include control of microstructure, analysis of nano structure, and analysis of atomic structure.
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Suh, C.H., Lee, R.G., Oh, S.K. et al. Effect of welding heat input on fatigue life of quenched boron steel and FB steel lap joint. J Mech Sci Technol 25, 1727–1735 (2011). https://doi.org/10.1007/s12206-011-0424-x
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DOI: https://doi.org/10.1007/s12206-011-0424-x