Abstract
To improve the fatigue properties in the welded joints of high strength steels, we developed an elongated bead method for low transformation temperature (LTT) welding materials. The proposed method intensifies the compressive residual stress and reduces the stress concentration. We investigated the length of the elongated bead in the boxing fillet portion of the gusset front, the effectiveness of inexpensive LTT wires with low Ni content and the potential applicability to repair welding. The most effective welding method, overlay of the elongated bead LTT weld metal on the conventional boxing fillet weld metal, extended the fatigue lifetime of the boxing fillet by seven to ten times. Residual stress distributions in joints welded with low-Ni metals of different martensite start temperatures (Ms) as well as the stress concentration in weld joints formed from elongated beads with different lengths were investigated in finite element simulations. Residual stress of weld and its toe was decreasing as the Ms of weld metal was lowering and the most compressive residual stress was obtained for weld metal with Ms temperature of 184 °C. The stress concentration reduces by about 30% of fatigue load, and the residual stress decreases down to compressive one of −685 MPa for the LTT overlay welding elongated bead treatment.
Similar content being viewed by others
References
Manteghi S, Maddox SJ (2004) Methods for fatigue life improvement of welded joints in medium and high strength steels. IIW-Doc. XIII-2006-04
Dahle T (1998) Design fatigue strength of TIG-dressed welded joints in high-strength steels subjected to spectrum loading. Int J Fatigue 20(9):677–681
Huther I, Suchier Y, Lieurade HP (2006) Fatigue behaviour of longitudinal non-loadcarrying joints improved by burr grinding, TIG dressing. IIW Doc. XIII-2108-06
Maddox SJ, Dore MJ, Smith SD (2011) A case study of the use of ultrasonic peening for upgrading a welded steel structure. Weld World 55(9/10):56–67
Mori T, Shimanuki H, Tanaka M (2012) Effect of uit on fatigue strength of web-gusset welded joints considering service condition of steel structures. Weld World 56:141
Haagensen PJ, Maddox S (2013) IIW recomendations on methods for improving fatigue lives of welded joints. Woodhead Publishing Ltd, International Institute of Welding, Paris
Shiga C, Hiraoka K (2016) Review and trend on fatigue improvement of steel welded joints using low transformation-temperature weld metal. J Japan Welding Soci 85(9):10–28 (in Japanese)
Shiga C (2000) Problems in welded joints and systematic approach to their solution in STX project. Sci Technol Weld Joint 5(6):356–364
Ohta A, Shiga C, Maeda Y, Suzuki N, Watanabe O, Kubo T (2000) Fatigue strength improvement of box-welded joints using low transformation temperature welding material. Weld Int 14(10):801–885
Ohta A, Shiga C, Maeda Y, Suzuki N, Watanabe O, Kubo T (2002) Fatigue strength improvement of box-welded joints using low transformation temperature welding material triple fatigue strength by post weld heat treatment. Weld Int 16(1):44–47
Yamamoto J, Hayakawa N, Zenitani S, Muramatsu Y, Hiraoka K (2003) Effect of transformation expansion of weld metal and restraint intensity of weld joint on residual stress distribution, Pre-Prints of the National Meeting of the JWS, vol. 72
Shiga C, Mraz L, Bernasovsky P, Hiraoka K, Mikula P, Vrana M (2007) Residual stress distribution of steel welded joints with weld metal of low transformation temperature. J Weld World 51(11/12):11–19
Shiga C, Yasuda Hiroyuki Y, Hiraoka K, Suzuki H (2010) Effect of Ms temperature on residual stress in welded joints of high strength steels. Welding in the World 54(3/4):71–79
Shiga C, Murakawa H, Matsuo Y, Hiraoka K (2014) Compressive residual stress in welded joints with low-temperature-transformation weld metal in high-strength steel, “In-situ studies with photons, neutrons, and electrons scattering II”, Springer, pp 95–108
Shiga C, Murakawa H, Matsuo Y, Ohsuga U, Hiraoka K, Morikage Y, Yasuda K (2014) Fatigue improvement in high-strength steel welded joints with compressive residual stress. Weld World 58(55–64):238–239
Shiga C, Murakawa E, Hiraoka K, Fukui T, Yajima H (2014) Improvement of Fatigue Strength of Boxing Fillet Welded Joints using Low Transformation Temperature Welding Material Preprints of the Symposium on Welded Structure of JWS, held at Osaka University, pp 57–63
Kitada H, Fukui T (2014) New advanced high strength “TMCP STEELS” extensively used for ship hull structure, Seizando.co.jp, pp77–78 (in Japanese)
Miyata M, Suzuki R (2014) Development of the practical LTT welding consumables and application method, Preprints of Welding structure symposium. Japan Welding Society 151–154
Miyata M, Suzuki R, Nagai T, Suga T (2014) Research of the fatigue strength improvement by Mn intentional addition in welding consumable, Preprints of the national meeting of Japan Welding society 95(426):358–359
Yıldırım HC (2014) Experimental verification of HFMI treatment of large structures. Advanced Structures Forcus Area/Fatigue and Fracture 1-13:1–3
Yıldırım HC (2016) Recent results on fatigue strength improvement of high-strength steel welded joints. Int J Fatigue 1–13
Marquis GB, Mikkola E, Yıldırım HC, Barsoum Z (2012) Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed fatigue assessment guide lines. Welding in the World 57(6):803–822
Shiga C, Hiraoka K, Yajima H, Tanino T, Murakawa H, Tsutumi S, Osawa N (2015) Development of advanced fatigue strength improvement method for ship's out-of-plane gusset welded joints using low transformation temperature welding material, The pro. of ISOPE-2015
Shiga C, Murakawa H, Hiraoka K, Osawa N, Yajima H, Tsutsumi S, Fukui T (2015) Investigation on practical application of low transformation temperature welding materials to ship hull structure made of high tensile strength steel plates for fatigue life improvement. The pro. of IIW International Conference “High-Strength Materials - Challenges and Applications”, 2-3July 2015, Helsinki, Finland
Hobbacher A (2003) Recommendation for fatigue design of welded joints and components. Document XIII-1965-03/XV-1127-03, International Institute of Welding.
Nishikawa H, Oda I, Serizawa H, Murakawa H (2004) Development of high-speed and high-precision FEM for analysis of mechanical problems in welding. Trans JWRI 33(2):161–166
Weich I, Ummenhfer T, Nitschke T, Dilger K, Eslami H (2009) Fatigue behavior of welded high-strength steels after post-weld treatments. Welding in the World 53(11/12):322–332
Acknowledgement
This research was carried out as a part of a joint research project among ClassNK, Osaka University, Nagasaki Institute of Applied Science (NIAS), Mitsubishi Heavy Industries Ltd., Imabari Shipbuilding Co., Ltd. and Sanwa Dock Co., Ltd. in the ClassNK Joint, R&D for Industry Programs.
Author information
Authors and Affiliations
Corresponding author
Additional information
Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures
Rights and permissions
About this article
Cite this article
Shiga, C., Murakawa, H., Hiraoka, K. et al. Elongated bead weld method for improvement of fatigue properties in welded joints of ship hull structures using low transformation temperature welding materials. Weld World 61, 769–788 (2017). https://doi.org/10.1007/s40194-017-0439-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s40194-017-0439-8