Mechanical properties of duplex steel welded joints in large-size constructions

• Autorzy: Nowacki J. , Zając P.
• Języki publikacji: EN

Abstrakty

EN

Purpose: On the basis of sources and own experiments, the analysis of mechanical properties, applications as well as material and technological problems of ferritic-austenitic steel welding were carried out. It was shown the area of welding applications, particularly welding of large-size structures, on the basis of example of the FCAW method of welding of the UNS S3 1803 duplex steel in construction of chemical cargo ships. Design/methodology/approach: Welding tests were carried out for duplex UNS S31803 steel plates, 9.5, 14.5 and 18.5 mm thick, with flux-cored wire The effect of welding with increased threshold space on mechanical properties of welded joints was determined when compared to those obtained in result of welding with 6 mm threshold space as well as to recommendations of DNV regulations and rules Findings: It was shown that widening of threshold space tolerance and wide-gap welding of duplex steel is possible, i.e. completion of welded joints by one-side vertical bottom-top welding (PF) with no need for applying the process of edge pad welding in case of weld groove geometry with the threshold space ranging 6 to 10 mm, from the point of view of meeting requirements with respect to mechanical properties by welded joints Research limitations/implications: The welding heat input exceeding the recommended values might influence the precipitation processes in the HAZ, what need further experiments. Practical implications: Application of high value of the welding heat input will be profitable in terms of the welding costs. Originality/value: An original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.

Słowa kluczowe

EN

metallic alloys; materials; welding; welding joints properties

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2012
• Tom: Vol. 54, nr 1
• Strony: 39--48
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Nowacki J.

• West Pomeranian University of Technology, Al. Piastów 19, 70-310 Szczecin, Poland

autor

Zając P.

• West Pomeranian University of Technology, Al. Piastów 19, 70-310 Szczecin, Poland

Bibliografia

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• [2] X. Li, A.P. Miodownik, N. Saunders, Modelling of materials properties in duplex stainless steels, Materials Science and Technology 18 (2002) 86-89.
• [3] J. Nowacki, A. Łukojć, Structure and properties of Heat affected zone of duplex steels joints, Journal of Materials Processing Technology 164-165 (2005) 1074-1081.
• [4] J. Nowacki, P. Rybicki, The influence if welding heat input on submereged arc welded duplex steel joints imperfections, Journal of Materials Processing Technology 164-165 (2005) 1082-1088.
• [5] J. Nowacki, P. Rybicki, Influence of heat input on corrosion resistance of SAW welded duplex joints, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 113-116.
• [6] J. Nowacki, P. Zając, Microstructure and corrosion resistance of the duplex steel wide-gap one-side fluxcored welded joints. Journal of Achievements in Materials and Manufacturing Engineering 29/2 (2008) 191-198.
• [7] J. Nowacki, M. Urbański, P. Zając, FCAW welding of duplex steel in construction of chemical cargo carriers, Welding International 1 (2009) 34-42.
• [8] J. Nowacki, Ferritic-austenitic steel and its weldability in large size constructions, Journal of Achievements in Materials and Manufacturing Engineering 32/2 (2009) 115-141.
• [9] K.J. Kurzydłowski, H. Matysiak, J. Nowacki, P. Zając, Corrosion resistance of welded joints made from duplex steel, Welding Technology Review 3 (2010) 3-10 (in Polish).
• [10] K.J. Kurzydłowski, H. Matysiak, J. Nowacki, Z. Zając, Fatigue strength of butt joints welded from duplex steel, Welding Technology Review 12 (2009) 3-10 (in Polish).
• [11] H. Hänninen, J. Romu, R. Ilola, J. Tervo, A. Laitinen, Effects of processing and manufacturing of high nitrogen-containing stainless steels on their mechanical, corrosion and wear properties, Journal of Materials Processing Technology 117 (2001) 424-430.
• [12] J.D. Kordatos, G. Fourlaris, G. Papadimitriou, The effect of cooling rate on the mechanical and corrosion properties of SAF 2205 (UNS 31803) duplex stainless steel welds, Scripta Materialia 44 (2001) 401-408.
• [13] J. Nowacki, Problems of welding duplex steel in chemical cargo ships, Welding Technology Review 9-10 (2003) 7-11.
• [14] J. Nowacki, Ferritic-austenitic steel and its weldability in large size constructions, Journal of Achievements in Materials and Manufacturing Engineering 32/2 (2009) 115-141.
• [15] J. Nowacki, P. Rybicki, Corrosion resistance of SAW duplex joints welded with high heat input, Journal of Achievements in Materials and Manufacturing Engineering 23/1 (2007) 7-14.