Fatigue Behaviour of Offshore T-Weld Connections Repaired by Grinding and Wet Welding

Abstract:

Fixed platforms employed in oil & gas shallow waters industry are subjected to dynamic loads created by winds, waves and currents. However, such loads can produce fatigue damage, like localized cracking in the weld toes of T-welded connections of the submerged structures of fixed platforms. Therefore, to repair localized cracking, a technique that combines grinding and wet welding can be applied at the weld toes of submerged structural connections. Accordingly, in the present work it is presented a methodology to restore the fatigue life of T-welded connections fabricated with A36 plate steel. Consequently, T-welded connections samples were prepared and tested under intact, grinding and grinding-wet-welding repair conditions. For the repair conditions, the weld toes were grinded 6 mm and 10 mm, and wet welding was deposited to fill the grinded material in a hyperbaric chamber, which simulated 50 m, 70 m and 100 m water depths. Afterwards, the repaired connections were subjected to fatigue loads, and the S-N curves were measured for intact and repair conditions. Fatigue results showed that the combined repair technique was able to restore the fatigue life of T-welded connections for a maximum water depth of 50 m. Nonetheless, for water depths of 70 m and 100 m the fatigue life was smaller than for 50 m, but higher compared to the only grinding repair condition.

• Periodical: Materials Science Forum (Volume 1088)
• Pages: 151-170
• DOI: https://doi.org/10.4028/p-725ti1
• Online since: May 2023
• Authors: Gerardo Terán-Mendez, Ruben Cuamatzi-Melendez*, Liliana Medina-Almazán, Apolinar Albiter Hernández
• Keywords: Coated E6013 Electrodes, Fatigue, Grinding, S-N Curves, T-Welded Connections, Wet Welding

References

[1] G. Terán, A. Albiter, R. Cuamatzi-Meléndez, Parametric evaluation of the stress concentration factors in T-butt welded connections, Eng. Struct., 56 (2013) 1484–1495.

DOI: 10.1016/j.engstruct.2013.06.031

[2] W. Gao, D. Wang, F. Cheng, C. Deng, Y. Liu, W. Xu, Enhancement of the fatigue strength of underwater wet welds by grinding and ultrasonic impact treatment, J. Mater Process Tech., 223 (2015) 305–312.

DOI: 10.1016/j.jmatprotec.2015.04.013

[3] S. van Es, H. Slot, H. Steenbergen, J. Maljaars, R. Pijpers, Use of HSS and VHSS in steel structures in civil and offshore engineering, Steel Construction, 11 (2018) 249–256.

DOI: 10.1002/stco.201800018

[4] J. Berg, N. Stranghoener, Fatigue strength of welded ultra high strength steels improved by high frequency hammer peening, Procedia Materials Science, 3 (2014) 71–76.

DOI: 10.1016/j.mspro.2014.06.015

[5] T. Shiozaki, N. Yamaguchi, Y. Tamai, J. Hiramoto, K. Ogawa, Effect of weld toe geometry on fatigue life of lap fillet welded ultra-high strength steel joints, Int. J. Fatigue., 116 (2018) 409–420.

DOI: 10.1016/j.ijfatigue.2018.06.050

[6] A. Ahola, A. Muikku, M. Braun, T. Björk, Fatigue strength assessment of ground fillet-welded joints using 4R method, Int. J. Fatigue., 142 (2021) 105916.

DOI: 10.1016/j.ijfatigue.2020.105916

[7] B. J. Mecséri, B. Kövesdi, Assessment of grinding weld treatment methods using effective notch stresses, Welding in the World, 64 (2020) 1033–1046.

DOI: 10.1007/s40194-020-00894-3

[8] M. Braun, X. Wang, A review of fatigue test data on weld toe grinding and weld profiling, Int. J. Fatigue, 145 (2021) 106073.

DOI: 10.1016/j.ijfatigue.2020.106073

[9] E. Surojo, R. P. Aji, T. Triyono, E. P. Budiana, A. R. Prabowo, Mechanical and microstructural properties of A36 marine steel subjected to underwater wet welding, Metals 2021, Vol. 11, Page 999. 11 (2021) 999.

DOI: 10.3390/met11070999

[10] E. Surojo, J. Anindito, F. Paundra, A. R. Prabowo, E. P. Budiana, N. Muhayat, M. Badaruddin, Triyono, Effect of water flow and depth on fatigue crack growth rate of underwater wet welded low carbon steel SS400, Open Engineering, 11 (2021) 329–338.

DOI: 10.1515/eng-2021-0036

[11] E. Surojo, A. H. Gumilang, T. Triyono, A. R. Prabowo, E. P. Budiana, N. Muhayat, Effect of water flow on underwater wet welded A36 steel, Metals, 11 (2021) 682.

DOI: 10.3390/met11050682

[12] E. D. W. S. Putri, E. Surojo, E. P. Budiana, Triyono, Current research and recommended development on fatigue behavior of underwater welded steel, Procedia Structural Integrity, 27 (2020) 54–61.

DOI: 10.1016/j.prostr.2020.07.008

[13] G. Terán, R. Cuamatzi-Meléndez, A. Albiter, C. Maldonado, A. Q. Bracarense, Characterization of the mechanical properties and structural integrity of T-welded connections repaired by grinding and wet welding, Materials Science and Engineering A., 599 (2014) 105–115.

DOI: 10.1016/j.msea.2014.01.078

[14] G. T. Méndez, R. Cuamatzi-Meléndez, A.A. Hernández, Combination of grinding and wet welding to repair localized cracking in T-welded connections, Materials Science Forum, (2014) 51–58.

DOI: 10.4028/www.scientific.net/msf.793.51

[15] ASTM, Standard practice for presentation of constant amplitude fatigue test results for metallic materials, (2018).

[16] M. Rowe, S. Liu, Recent developments in underwater wet welding, Science and Technology of Welding and Joining, 6 (2001) 387–396.

DOI: 10.1179/stw.2001.6.6.387

[17] S. Y. Maksimov, O. M. Berdnikova, E. A. Prilipko, E. O. Paton, Analytical evaluation of strengthening, local internal stresses and micro deformations, Welded Joint Metal During Wet Underwater Welding, (2021).

DOI: 10.4028/www.scientific.net/ddf.410.342

[18] E. Ersoy, Recent trends and development of underwater welding, International Journal of Engineering Science and Application, 4 (2020).

[19] M. C. M. J. D. Priya, Underwater welding techniques, International Journal of Engineering and Advanced Technology, 8 (2019) 562–564.

[20] P. Kasat, O. Hongekar, K. Gaur, O. Godse, I. Naik, Study of developments in underwater welding, International Journal for Research, Engineering Application & Management, (2018) 131–135.

[21] J. Tomków, M. Landowski, D. Fydrych, G. Rogalski, Underwater wet welding of S1300 ultra-high strength steel, Marine Structures, 81 (2022) 103120.

DOI: 10.1016/j.marstruc.2021.103120

[22] E. Surojo, N. Muhayat, E. P. Budiana, A. P. Aridharma, Y. C. N. N. Saputro, T. Tuswan, E.D.W.S. Putri, A.R. Prabowo, T. Triyono, The Influence of water flow characteristics on the physical and mechanical qualities of underwater wet welded A36 marine steel plate, Metals, 12 (2022) 1295.

DOI: 10.3390/met12081295

[23] Z. Sun, S. Yin, Z. Chen, S. Li, W. Xu, G. Xiao, C. Shen, Z. Li, Y. Ma, L. Sun, Research and application of underwater wet welding technology, IOP Conf. Ser. Mater. Sci. Eng., 562 (2019).

DOI: 10.1088/1757-899x/562/1/012161

[24] H. Pratikno, Effect of underwater welding in marine environment and surface welding to mechanical properties of steel weld joint, Applied Mechanics and Materials, 862 (2017) 308–314.

DOI: 10.4028/www.scientific.net/amm.862.308

[25] E. C. P. Pessoa, A. Q. Bracarense, V. R. dos Santos, R. R. Marinho, H. L. Assunção, F. C. Rizzo, Post underwater wet welding heat treatment by underwater wet induction heating, Weld J., 100 (2021) 229–238.

DOI: 10.29391/2021.100.020

[26] J. Tomków, Weldability of underwater wet-welded HSLA steel: effects of electrode hydrophobic coatings, Materials, Vol. 14, (2021) 1364.

DOI: 10.3390/ma14061364