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

Year 2019, Volume: 7 Issue: 3, 436 - 441, 28.09.2019

Polat Topuz

https://doi.org/10.21541/apjes.422153

Abstract

 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.

Keywords

PWHT, Ön Isıtma, 2.25Cr1Mo Çeliği, GTAW, SMAW

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

Abstract

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.

Keywords

PWHT, Preheating, 2.25Cr1Mo Steel, GTAW, SMAW

References

• [1] Jan Hilkes, Volker Gross: “Welding CrMo steels for power generation and petrochemical applications - past, present and future”, Biuletyn Instytutu Spawalnictwa, No:2, (2013), pp12-22.
• [2] Bramfitt,B.L; Benscoter,A.O.: “Metallographer’s Guide (Practices and Producers for Irons and Steels), ASM International, Metarials Park, OH 44073, (2002)
• [3] King, B.: “Welding and Post Weld Heat Treatment of 2.25%Cr-1%Mo Steel” University of Wollongong Thesis Collections, (2005), pp.9-40.
• [4] Welding Handbook, Welding Processes, Volume 2, 8th Edition, American Welding Society, Miami, FL, (1991)
• [5] Weman, K.: “Welding Processes Handbook” 2nd Edition, Woodhead Publishing, Cambridge, UK, (2012), pp. 63.
• [6] http://www.advantagefabricatedmetals.com/tig-welding.html, date of access 2017
• [7] N. Habibpour, A. Shafyei, R. A. Najafabadi, A.Meysami, Revue de Métallurgie (2017) pp.114, 312
• [8] 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)
• [9] EN 4136-2012: Destructive tests on welds in metallic materials -- Transverse tensile test.
• [10] EN 5173-2009: Destructive tests on welds in metallic materials -- Bend tests.
• [11] EN 9016-2012: Destructive tests on welds in metallic materials -- Impact tests -- Test specimen location, notch orientation and examination.
• [12] EN 9015-1-2001: Destructive tests on welds in metallic materials -- Hardness testing -- Part 1: Hardness test on arc welded joints.
• [13] EN 17639-2003: Destructive tests on welds in metallic materials -- Macroscopic and microscopic examination of welds.