Effect of TID-dressing on Fatigue Life Stress Concentration Factor in St37-2Butt Weldments
الموضوعات :
Abbas Fadaei
1
(Department of Mechanical Engineering,
University of Bu-Ali Sina, Iran)
Mostafa Jalalizadeh
2
(Department of Mechanical Engineering,
University of Bu-Ali Sina, Iran)
Faeze Mohammad Zaheri
3
(Department of Mechanical Engineering,
University of Bu-Ali Sina, Iran)
الکلمات المفتاحية: Butt Welded Joint, TIG-Dressing, Fatigue Life, Stress Concentration Factor,
ملخص المقالة :
The researchers have shown that there are cracks in the toe weld and they have an important role in the welding failure. The elimination of these shortcomings and the improvement of the fatigue life have always been a concern for the industrial designers. One method of improving the fatigue life of the welded joint at its geometry branch is to remelt the toe region of the steel weldments using the Tungsten Inert Gas (TIG) method or TIG-dressing. This method affects the material structure, hardness, stress coefficient and welding shape. In this study, the effectiveness of this method on fatigue and stress concentration at the weld toe was investigated. The experimental results showed that the toe weld form was changed by TIG – dressing and thus increased the radius and decreased the toe weld’s angle, so that the stress was reduced by TIG – dressing. Also, the fatigue tests showed that the fatigue life increased by an average of approximately 30 percent. Finally, the stress concentration factors were obtained using ABAQUS finite element analysis. The amount of stress concentration factors in weldments before and after TIG – dressing were respectively achieved to be 2.4 and 1.3.
[1] Huo, L., Wang, D., and Zhang, Y., Investigation of the Fatigue Behaviour of the Welded Joints Treated by TIG Dressing and Ultrasonic Peening under Variable-Amplitude Load, International Journal of Fatigue, Vol. 27, No. 1, 2005, pp. 95-101.
[2] Perović, Z. D., Investigation of the Fatigue Strength of the Welded Joints Treated by TIG Dressing, Archives of Materials Science, Vol. 28, 2007, 113-117.
[3] Tateishi, K., Hanji, T., and Hanibuchi, T., Improvement of Extremely Low Cycle Fatigue Strength of Welded Joints by toe Finishing, Welding in the World, Vol. 53, No 9-10, 2009, pp. R238-R45.
[4] Ramalho, A. L., Ferreira, J. A. M., and Branco, C., Fatigue Behaviour of T-Welded Joints Rehabilitated by Tungsten Inert Gas and Plasma Dressing, Materials & Design, Vol. 32, No. 10, 2011, pp. 4705-4713.
[5] Li, D. X., Jia, B. C., and Zhu, Y. Z., Enhancement of the Fatigue Property of the Crack of Cruciform Welded Joints by TIG-Dressing, Advanced Materials Research, Vol. 146-147, 2011, pp. 1419-1422.
[6] Li, C. R., Cao, Z. P., and Fang, Z. T., Research on Methods of Improving Fatigue Property of Low-Strength Steel Welded Joints, Applied Mechanics and Materials, Vol. 538, 2014, pp. 48-53.
[7] Lee, C. H., Chang, K. H., Finite Element Computation of Fatigue Growth Rates for Mode I Cracks Subjected to Welding Residual Stresses, Engineering Fracture Mechanics, Vol. 78, No. 13, 2011, pp. 2505-2520.
[8] Fang, Z. T., Research Progress of Methods to Improve Fatigue Strength of Welded Structures, Applied Mechanics and Materials, Vol. 217-219, 2012, pp. 1614-1617.
[9] Zhou, K., Shi, C. Y., and Jin, C., Influence of Cooling Intensity on Residual Stress State of TIG Dressing Zone for T-Joint Welded Toe, Applied Mechanics and Materials, Vol. 148-149, 2012, pp. 1289-1294.
[10] Wu, L. C., Wang, D. P., Improve the Fatigue Performance of Welded Joints with Undercuts by TIG-Dressing Treatment, Advanced Materials Research, Vol. 472-475, 2012, pp. 1300-1304.
[11] Gerritsen, C., Vanrostenbergh, S., and Doré, M., Diode Laser Weld Toe Re-Melting as a Means of Fatigue Strength Improvement in High Strength Steels, Procedia Engineering, Vol. 66, 2013, pp. 171-180.
[12] Van Es, S. H. J., Kolstein, M. H., Pijpers, R. J. M., and Bijlaard, F. S. K., TIG-Dressing of High Strength Steel Butt Welded Connections – Part 1: Weld Toe Geometry and Local Hardness, Procedia Engineering, 5th International Conference on Fatigue Design, Vol. 66, 2013, pp. 216-225.
[13] Van Es, S. H. J., Kolstein, M. H., Pijpers, R. J. M., and Bijlaard, F. S. K., TIG-Dressing of High Strength Butt Welded Connections – Part 2: Physical Testing and Modelling, Procedia Engineering, Vol. 66, 2013, pp. 126-37.
[14] Yildrim, H. C., Review of Fatigue Data for Welds Improved by Tungsten Inert Gas Dressing, International Journal of Fatigue, Vol. 79, 2015, pp. 36-45.
[15] Barsoum, Z., Barsoum, I., Residual Stress Effects on Fatigue Life of Welded Structures Using LEFM, Engineering Failure Analysis, Vol. 16, No. 1, 2009, 449-467.
[16] Nuraini, A. A., Zainal, A. S. M., and Azmah Hanim, M., The Effect of Welding Process Parameter on Temperature and Residual Stress in Butt-Joint Weld of Robotic Gas Metal Arc Welding, Australian Journal of Basic and Applied Sciences, Vol. 7, No. 7, 2013, 814-820.
[17] Hildebrand, J., Starcevic, I., Werner, F., Heinemann, H., and Köhler, G., Numerical Simulation of TIG-Dressing of Welded Joints, International Conference on Computing and Decision Making in Civil and Building Engineering, Montréal, Canada, 2006.
[18] Goldak, J. A., Akhlaghi, M., Computational Welding Mechanics, Springer, USA, 2005.
[19] AWS, D1.1/D1.1M, Structural Welding Code-Steel. American Welding Society, 2015.
