Weldability and Service Conditions of Steels in Thermal Power Plant Applications

Year 2022, Volume: 3 Issue: 1, 25 - 29, 31.07.2022

Bünyamin Çiçek Yavuz Sun

Abstract

In this study, the usage purposes of the steel grades used in Thermal Power Plant applications were compiled. The welding conditions between the steels are specified. The service conditions and quantities of low carbon and Cr-Mo alloy steels used in thermal power plants are explained. Additional metal groups preheat and inter-pass temperatures, non-destructive examinations, and post-weld heat treatment conditions are explained in the welding of the Cr-Mo alloy steels used. The availability of pre-heat conditions before welding was examined according to the relevant standards. The selection conditions of the additional metals, welding positions, and welding conditions of the welders were examined. The weldability of steels of similar or dissimilar quality is discussed. Information about post-weld stress relieving heat treatment has been compiled from the relevant standards and the conditions for which quality steel will be used have been analyzed. As a result, in this study, all the welding-related stages of the steels used in Thermal Power Plants were examined.

Keywords

Thermal Power Plant, Cr-Mo Steel, Weldability, Filler Metal, PWHT

References

• [1] Hu, Z.-F., Heat-Resistant Steels, Microstructure Evolution and Life Assessment in Power Plants, Thermal power plants (2012) 195-226.
• [2] Arivazhagan, B., Sundaresan, S., Kamaraj, M., A Study on Influence of Shielding Gas Composition on Toughness of Flux-Cored Arc Weld of Modified 9cr–1mo (P91) Steel, Journal of Materials Processing Technology 209(12-13) (2009) 5245-5253.
• [3] Kihara, H., Kanazawa, T., Tamura, H., Weldability and Toughness Specifications for Structural Steels in Japan-with Special Reference to Wes-135 and-136, Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences (1976) 247-258.
• [4] Watanabe, J., Temper Embrittlement, of 2-1/4cr 1mo Pressufe Vessel Steel, Proc. 29th Petroleum Mechanical Engineering Conf., Dallas, ASME, (1974)
• [5] Gross, V., Heuser, H., Jochum, C., Neuartige Schweisszusätze Für Bainitische Und Martensitische, Publication of Böhler Thyssen Schweisstechnik, Germany (2005)
• [6] Hilkes, J., Gross, V., Welding Crmo Steels for Power Generation and Petrochemical Applications-Past, Present and Future, Biuletyn Instytutu Spawalnictwa 2((2013) 12-22.
• [7] Hilkes, J., Gross, V., Soldadura De Los Aceros Crmo Para Aplicaciones En La Generación De Energía Y Petroquímica “-Pasado, Presente & Futuro, CESOL Conf. Proc. 1er Congreso Internacional de Soldadura y Technologías de …, (2008)
• [8] Hilkes, J., Gross, V., Welding Crmo Steels for Power Generation and Petrochemical Applications, Past, Present & future (2009)
• [9] Alhassan, M., Bashiru, Y., Carbon Equivalent Fundamentals in Evaluating the Weldability of Microalloy and Low Alloy Steels, World Journal of Engineering and Technology 9(4) (2021) 782-792.
• [10] Bandhu, D., Abhishek, K., Assessment of Weld Bead Geometry in Modified Shortcircuiting Gas Metal Arc Welding Process for Low Alloy Steel, Materials and Manufacturing Processes 36(12) (2021) 1384-1402.
• [11] Dhandha, K. H., Badheka, V. J., Effect of Activating Fluxes on Weld Bead Morphology of P91 Steel Bead-on-Plate Welds by Flux Assisted Tungsten Inert Gas Welding Process, Journal of Manufacturing Processes 17((2015) 48-57.
• [12] Yu, X., Babu, S. S., Terasaki, H., Komizo, Y., Yamamoto, Y., Santella, M. L., Correlation of Precipitate Stability to Increased Creep Resistance of Cr–Mo Steel Welds, Acta Materialia 61(6) (2013) 2194-2206.
• [13] Samardžić, M., Marsenić, T., Herceg, A., Marić, D., Despotović, B., Welding, Control and Repair of Membrane Welds, Zavarivanje i zavarene konstrukcije 66(4) (2021) 176-185.
• [14] Tscheliesnig, P., Training and Certification on Field of Acoustic Emission Testing (at) According the European Standardisation (En 473). 2004, EWGAE.
• [15] Silva, A. C. S., Araujo, H. R., Macena, V. A., Moreno, J. R. S., Vicente, A. A., Hermenegildo, T. F., Santos, T. F., Applied Methodology for Qualification of Welding Procedures of Industrial Pipes According to Asme B 31.3 and Asme Section Ix, Soldagem & Inspeção 24((2019)