Evaluation of s355nl Steel Welded by Flux Cored Arc Welding Using Different Tubular Wires
Keywords:S355 NL steel, Welding, Tubular wire, Submarine, Mechanical properties, Electrochemical behavior
High strength low alloy (HSLA) steels are used in several industrial sectors, as they have good mechanical strength and easy weldability. This HSLA is present in several areas, such as naval, petrochemical, piping, and civil construction. S355 NL steel is HSLA grade and has its application in the manufacture of the Brazilian submarine. For the manufacture and finishing of a Brazilian submarine, countless welds are performed during the assembly steps. The welding process currently applied is FCAW (Flux Cored Arc Welding), and the currently applied filler metal is of French origin. However, this import, from France to Brazil, makes manufacturing costs high and the waiting time for the imported product to arrive is long. Thus, in this work, the idea was to characterize a national filler metal (Brazilian) that similarly maintained the microstructure and consequently its mechanical and electrochemical properties concerning the imported filler metal (French). Therefore, the present work aimed at the microstructural, mechanical, and electrochemical characterization of S355NL structural steel welded by the FCAW process with national tubular wire (Brazilian) and imported tubular wire (French). We performed microstructural characterization with the aid of optical microscopy (OM) and scanning electron microscopy (SEM). For the mechanical characterization, we performed the following tests: tensile test, Vickers hardness, and impact at room temperature and -40ºC. In the electrochemical characterization, it generated polarization curves where the samples were exposed to a 3.5% NaCl solution to test the behavior in corrosive media. The results showed that the wires, national and imported, behaved homogeneously and uniformly concerning the mechanical properties. In the electrochemical part, the national material presented in the weld metal a corrosion current density interesting. Therefore, the national tubular wire is a promising filler metal for the welding application of this Brazilian submarine.
. F. Pastorek, K. Borko, S. Fintová, D. Kajánek, and B. Hadzima, “Effect of Surface Pretreatment on Quality and Electrochemical Corrosion Properties of Manganese Phosphate on S355J2 HSLA Steel,” Coatings, vol. 6, no. 4, p. 46, 2016.
. C. I. Garcia, High strength low alloyed (HSLA) steels. Elsevier Ltd, 2016.
. S. R. Nathan, V. Balasubramanian, S. Malarvizhi, and A.G. Rao, and, “Effect of Welding Process on Mechanical and Microstructural Characteristics of High Strength Low Alloy Naval Grade Steel Joints,” Defence Technology, vol. 11, no. 3, p. 308-317, 2015.
. V. D. Poznyakov, S.L. Zhdanov, and A. A. Maksimenko, “Structure and properties of welded joints of steel S390 ( S355J2),” The Paton Welding Journal, no. 8, pp. 06–10, 2012.
. K. Borko, F. Pastorek, M. N. Jacková, and B. Hadzima, “Electrochemical properties of welded S355J2 steel before and after surface treatment by manganese phosphating,” Mater. Today Proc., vol. 5, no. 13, pp. 26482–26488, 2018.
. K. Sirin, S. Y. Sirin, and E. Kaluc, “Influence of the interpass temperature on t8/5 and the mechanical properties of submerged arc welded pipe,” J. Mater. Process. Technol., vol. 238, pp. 152–159, 2016.
. L. Kolarik, M. Kolarikova, P. Vondrous, and R. Hrabina, “The choice of parameters for welding of steel S355NL,” 23rd DAAAM Int. Symp. Intell. Manuf. Autom. 2012, vol. 2, no. February 2016, pp. 1027–1030, 2012.
. K. Borko, B. Hadzima, and F. Pastorek, “The corrosion properties of S355J2 steel welded joint in chlorides environment,” Period. Polytech. Transp. Eng., vol. 47, no. 4, pp. 342–347, 2019.
. British Standards, “Hot rolled products of structural steels—Part 1: General technical delivery conditions,” BS EN 10025-12004, vol. 3, p. 36, 2004.
. H. Alipooramirabad, A. Paradowska, R. Ghomashchi, and M. Reid, “Investigating the effects of welding process on residual stresses, microstructure and mechanical properties in HSLA steel welds,” J. Manuf. Process., vol. 28, pp. 70–81, 2017.
. M. Vural, Welding Processes and Technologies, vol. 6. Elsevier, 2014.
. American Welding Society, “Specification for Carbon Steel Electrodes for Flux Cored Arc Welding.,” Am. Natl. Stand. Institute, Stand., 2010.
. International Standard ISO 14175, “Welding consumables — Gases and gas mixtures for fusion welding and allied processes,” 2008.
. G. R. Mohammed, M. Ishak, S. N. Aqida, and H. A. Abdulhadi, “Effects of heat input on microstructure, corrosion and mechanical characteristics of welded austenitic and duplex stainless steels: A review,” Metals (Basel)., vol. 7, no. 2, 2017.
. G. S. Da Fonseca, L. O. R. Barbosa, E. A. Ferreira, C. R. Xavier, and J. A. De Castro, “Microstructural, mechanical, and electrochemical analysis of duplex and superduplex stainless steels welded with the autogenous TIG process using different Heat Input,” Metals (Basel)., vol. 7, no. 12, 2017.
. ASTM E112-10, “ASTM International, E112: Standard Test Methods for Determining Average Grain Size,” ASTM Int., vol. 96, no. 2004, pp. 1–26, 2004.
. R. Russ, J.C; Dehoff, Practical Stereology, 2nd ed., New York, NY, USA: Kluwer Academic/Plenum Publishers, 2000, pp. 45–78.
. International Standard ISO 6507-2, “Metallic materials — Vickers hardness test - Part 2: Verification and calibration of testing machines,” 2018.
. ASTM, “A370: Standard Test Methods and Definitions for Mechanical Testing of Steel Products,” ASTM Int., pp. 1–50, 2014.
. British Standards, “Destructive tests on welds in metallic materials — Impact tests — Test specimen location, notch orientation and examination,” BS EN 875, 1995.
. D. Liang Ren, F. ren Xiao, P. Tian, X. Wang, and B. Liao, “Effects of welding wire composition and welding process on the weld metal toughness of submerged arc welded pipeline steel,” Int. J. Miner. Metall. Mater., vol. 16, no. 1, pp. 65–70, 2009.
. C. Liu, L. Shi, Y. Liu, C. Li, and H. Li, “Acicular ferrite formation during isothermal holding in HSLA steel,” J. Mater. Sci., vol. 51, no. 7, pp. 3555–3563, 2016.
. M. C. Zhao, K. Yang, and Y. Y. Shan, “Comparison on strength and toughness behaviors of microalloyed pipeline steels with acicular ferrite and ultrafine ferrite,” Mater. Lett., vol. 57, no. 9–10, pp. 1496–1500, 2003.
. H.H. Huang, W.T. Tsai, and J.T. Lee“ The Influences Of Microstructure and Composition On The Electrochemical Behavior Of A516 Steel Weldment,” Corros. Sci., vol. 36, no. 6, pp. 1027–1038, 1994.
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