The influence of the shape of weld nobs on the fatigue strength of S540Q steel

• Autorzy: Cicholska M.

Identyfikatory

DOI

10.5604/12314005.1217190

• Języki publikacji: EN

Abstrakty

EN

The development of weldable steels was discussed together with the methods of obtaining them. The influence of these methods on steel properties was explained. Research was performed on quenched weldable S540Q steel of high strength. Basic mechanical properties of this steel were determined. The results of a static tensile test and technological bending test were given. Next, steel sheets were welded by semi-automatic MAG method. The welds quality was examined and their future suitability was stated. Mechanical properties of the joints welded of this steel were determined. Mechanical properties of native material and welded joints were compared. Joints microstructure was examined in the weld axis, in the heat influence zone and in the native material. Fatigue tests were conducted in the cycle of nonsymmetrical tension – compression of welded joints. The analytical fatigue strength was obtained and it was compared with fatigue strength of welded joints. Tests results were elaborated with the static analysis of linear regression. Wohler diagrams were made after conducting fatigue tests. Finally, weldable joints were melted by TIG method without adding filler metal. The angle and radius of welds nobs entrance into the native material was measured. The increase of fatigue strength is related to the decrease of geometric notch on the edges of weld nobs.

Słowa kluczowe

EN

weldability; high strength weldable steel; fatigue strength

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 4
• Strony: 63--69
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Cicholska M.

• Gdynia Maritime University Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia tel.: [phone]

Bibliografia

• [1] Besu, B., Microstructural variations in high-strength structural steel weld under isohead input conditions, Welding Journal, No. 11, 2002.
• [2] Brózda, J., Spawalność stali o wysokiej wytrzymałości, Opracowanie Instytutu Spawalnictwa w ramach SPUB, 2005.
• [3] Cicholska, M., Czechowski, M., Materiałoznastwo okrętowe, Skrypt AM w Gdyni, 2012.
• [4] Cicholska, M., Analiza przydatności ulepszanych cieplnie stali 15G2ANb, 18G2AV-1 i 14HNMBCu na konstrukcje koparek, Rozprawa doktorska, Politechnika Gdańska, Gdansk 1994.
• [5] Cudny, K., Bugłacki, H., Krzysztofowicz, T., Puchaczewski, N., Metaloznawstwo Okrętowe, WPG, Gdansk 2002
• [6] Det Norske Veritas, Rules for clasification steel ship, Part 2, Chapter 3, Section 2, Welding procedure and approval of welders, Oslo 2010.
• [7] Górka, J., Spawalność stali obrabianej termomechanicznie o wysokiej granicy plastyczności, Biuletyn Instytutu Spawalnictwa, 5, 2010.
• [8] Holzner, A., Spawanie wysokowytrzymałych drobnoziarnistych stali konstrukcyjnych metodą MAG drutami proszkowymi, Biuletyn Instytutu Spawalnictwa, 4, 2011.
• [9] Pilarczyk, J., Zeman, W., Spawalnictwo dziś i jutro, Biuletyn Instytutu Spawalnictwa, 5, 2012.
• [10] Polski Rejestr Statków. Przepisy klasyfikacji i budowy statków morskich 1990, Tom 7, Część IX, Zmiany nr 1/2009, Gdańsk 2009.
• [11] Węglowski, M., Nowoczesne stale ulepszane cieplnie – własności i korzyści z ich zastosowania, Biuletyn Instytutu Spawalnictwa, 4, 2012.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.