Corrosion resistance of SAW duplex joints welded with high heat input

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

Abstrakty

EN

Purpose: test if the welding heat input exceeding the recommended values has negative impact on strength properties and corrosion resistance of the executed welded joints as well as description of influence of the heat input of submerged arc welding (SAW) of duplex steel UNS S31803 (0.032%C, 23.17%Cr, 9.29%Ni, 3.48%Mo, 0.95%Mn, 0.7%Si, 0.16%N, 0.017P, 0.006%S, 0.11%Cu) on welded joints microstructure, particularly average values of ferrite volume fraction, mechanical properties, and corrosion resistance. Design/methodology/approach: analysis of welding heat input influence on mechanical properties, value of ferrite share, and corrosion of test joints has been done. Non-destructive and destructive testing, e. g. visual examinations, microstructure examination, corrosion resistance tests according to ASTM G48 Method A, HV5 hardness tests, impact and tensile test were carried out. For analysis of welding heat input influence on creation of welding imperfections, there were executed welding of sheet of thickness 9, 14, 28 mm. Butt joints on plates of different thickness were made where the applied heat input of welding exceeded the 2.5 kJ/mm value. Maximum heat input level was HI lto 3.0; HI lto 3.5; HI lto 4.0; HI lto 4.5; HI lto 5.0. Findings: based on the performed tests the conclusion is that according to DNV Rules the welding heat input exceeding the recommended values has no negative impact on strength properties and corrosion resistance of the executed welded joints. It was shown that submerged arc welding of duplex steel with the heat input from 2.5 kJ/mm up to 5.0 kJ/mm has no negative influence on properties of the joints. Research limitations/implications: the welding heat input exceeding the recommended values may influenced 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; corrosion; metallography; technological design; welding

PL

stopy metaliczne; korozja; metalografia; projekt technologiczny; spawanie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 23, nr 2
• Strony: 7--14
• Opis fizyczny: Bibliogr. 15 poz., fot., rys., tab.

Twórcy

autor

Nowacki J.

autor

Rybicki P.

• Institute of Materials Science and Engineering, Szczecin University of Technology, Al. Piastów 19, 70-310 Szczecin, Poland,

Bibliografia

• [1] 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.
• [2] E. Engindeniz, Unterpulver-Hochleistungsschweißen mit Fülldrahtelektroden - materials with High Conference of Welding Technique, Proceeding of Conference - Essen 1993,170-176.
• [3] J.O. Nilsson, Super duplex stainless steels. Materials Science and Technology 8 (1992) 685-690.
• [4] J. Bernasovský, T. Orszáková, J. Žaček, J. Kudlička, The effect of welding and repairs on the properties of duplex stainless steel, Welding 5 (1995) 3-6.
• [5] J. Łabanowski, Stress corrosion cracing susceptibility of dissimilar stainless welded joints, Journal of Achivements in Materials and Manufacturing Engineering 20 (2006) 255-258.
• [6] L.A. Dobrzański, Z. Brytan, M. Actis Grande, M. Rosso, Corrosion resistance of sinters duplex stainless steel evaluated by electrochemical method, Journal of Achievements in Materials and Manufacturing Engineering 19/1 (2006) 113-116.
• [7] J.R. Still, The use of duplex stainless steel in the offshore oil and gas industry Welding & Metal Fabrication (1994), 331 335.
• [8] U. Draugelates, C. Bopper, A. Scharm, Properties of welded joints in ferritic-austenitic duplex, Casting, Welding and Cutting 11 (1994) E 184.
• [9] 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.
• [10] J.O. Nillson, T. Huhtala, P. Jonsson, L. Karlsson, A. Wilson, Structural stability of super duplex stainless wells metals and its dependence on tungsten and copper. Metallurgical and Materials Transactions 27A (1996) 2196-2200.
• [11] Nowacki J, Duplex - steel welding problems in the building of chemical cargo ships, Welding International 18/7 (2004) 509-515.
• [12] J.O. Nilsson, L. Karlsson. J.O.Anderson, Secondary austenite formation and its relation to pitting corrosion in duplex stainless steel weld metal, Materials Science and Technology 11 (1995) 276-283.
• [13] 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.
• [14] J. Nowacki, P. Rybicki, Influence of heat input on corrosion resistance of SAW welded duplex joints, Proceeding of the 14th International Scientific Conference Achievements in Mechanical and Materials Engineering, Wisła 2006, Abstract Book, 103.
• [15] A. Łukojć, Microstructure transformations of duplex steels welded joints heat affected zone, Materials Characterization 56 (2006) 436-441.