SMAW ve GTAW Metotları ile Kaynaklanmış Yüksek Sıcaklık ve Basınç Dirençli Nükleer Enerji Santrali Çeliğinin Mekanik Özelliklerine Kaynak Sonrası Isıl İşleminin Etkisi

Bu çalışma, GTAW (gaz tungsten ark kaynağı) ve SMAW (elektrik ark kaynağı) ile kaynaklanmış 2.25Cr1Mo (P22) yüksek sıcaklık ve basınca dayanıklı nükleer santral çeliğinin mekanik özellikleri üzerine Kaynak Sonrası Isıl İşleminin (PWHT) etkisini araştırmayı amaçlamaktadır. Kaynak işlemlerinden önce kaynak yapılacak malzemelere 200 °C' de ön ısıtma uygulanmıştır. Malzemelerin kaynak işlemleri oda sıcaklığında gerçekleştirilmiştir. Kaynak işlemlerinden sonra kaynak sonrası ısıl işlem (PWHT) 2 saat süreyle 750 °C' de uygulanmıştır. PWHT'den önce ve sonra, EN standartlarına göre hazırlanan kaynaklı malzemelerin, mekanik özelliklerin incelenmesi için, çekme, eğme, darbe, sertlik testleri ve makro yapı testleri uygulanmıştır.

Effect of PWHT on Mechanical Properties of High Temperature and Pressure Resistant Nuclear Power Plant Steel Welded with SMAW and GTAW Methods

This research aims at effect of Post Welding Heat Treatment (PWHT) on mechanical properties of 2.25Cr1Mo (P22) high temperature and pressure resistant nuclear power plant steel welded with GTAW (gas tungsten arc welding) and SMAW (shielded metal arc welding). Pre-heating was applied to the materials to be welded at 200°C before welding processes. Welding processes of materials were performed at room temperature. After welding processes, post weld heat treatment (PWHT) was applied at 750⁰C for 2 hours. Before and after the PWHT, welded materials were prepared in accordance with EN standards for tensile, bending, impact, hardness tests and macrostructure examinations for the investigation of mechanical properties.

PDF

___

[1] J. Hilkes, V. Gross, “Welding CrMo steels for power generation and petrochemical applications - past, present and future”, Biuletyn Instytutu Spawalnictwa, Vol.2, pp.12-22, 2013
[2] B. L. Bramfitt, A. O. Benscoter, Metallographer’s Guide - Practices and Producers for Irons and Steels, Ohio, USA, ASM International, 2002
[3] B. King, “Welding and Post Weld Heat Treatment of 2.25%Cr-1%Mo Steel” Ph.D. University of Wollongong Thesis Collections, Australia, 2005
[4] R. L. O'Brien, Welding Handbook, Welding Processes, Volume 2, 8th Edition, Miami, USA, American Welding Society, 1991
[5] https://136.3dpd.co/smaw-welding-diagram. html, (date of access September,10, 2018)
[6] Weman, K.: “Welding Processes Handbook” 2nd Edition, Cambridge, UK, Woodhead Publishing, 2012
[7]http://www.advantagefabricatedmetals.com/tigwelding.html, (date of access December, 3, 2017)
[8] N. Habibpour, A. Shafyei, R. A. Najafabadi, A. Meysami, “Effects of post-weld heat treatment temperature on the microstructure and mechanical properties of welded A517-Gr.B steel by SMAW method” Revue de Métallurgie , Vol 312, pp.114, 2017
[9] K. Ahmed and J. Krishnan: “Post-Weld Heat Treatment – Case Studies” International Symposium on Thermal Spray, Founder's Day Special Issue, Mumbai, May 2-4, (2002)
[10] R. S. Funderburk, “A Look at Heat Input,” Welding Innovation, Vol. 16, No. 1, pp. 8-11, 1999
[11] EN 4136-2012: Destructive tests on welds in metallic materials -- Transverse tensile test.
[12] EN 5173-2009: Destructive tests on welds in metallic materials -- Bend tests.
[13] EN 9016-2012: Destructive tests on welds in metallic materials -- Impact tests -- Test specimen location, notch orientation and examination.
[14] EN 9015-1-2001: Destructive tests on welds in metallic materials -- Hardness testing -- Part 1: Hardness test on arc welded joints.
[15] EN 17639-2003: Destructive tests on welds in metallic materials -- Macroscopic and microscopic examination of welds.
[16] B.Çiçek, E. G. İş, E.Gümüş, P.Topuz, “The Effect of Welding Positions on the Weldability of X20CrMoV11-1 Steels” Hittite Journal of Science and Engineering, Vol.5, No.1 pp. 75-83, 2018
[17] B. Aydemir, “The Differences and The Effects of Stress/Strain Rate in Tensile Test Standards”, Metal Dünyası Dergisi, Sayı 270, pp. 2-6, 2015