Influence of joining method for mechanical properties of 7020 aluminium alloy joints

• Autorzy: Dudzik K.
• Języki publikacji: EN

Abstrakty

EN

The article presents the research results on the mechanical properties of aluminum alloy 7020 and its FSW and MIG welded joints. Welding parameters used for the connection of the sheets made of 7020 alloy were presented. Metallographic analysis showed the correct construction of structural bonded joints. Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. FSW method can be an alternative to traditional arc welding methods, especially MIG, which is the most common method of joining aluminum alloys used in shipbuilding. The research was carried out using a static tensile test in accordance with the requirements of the Polish Standards PN-EN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Flat samples cut perpendicular to the direction of rolling were used. The research was conducted at the temperature of + 20ºC. Friction stir welded joints of 7020 alloy have higher strength properties compared to MIG welded joints. The yield stress of FSW joint is higher by 14.2% compared to MIG welded joint, and at the same level as the native material. Plastic properties of FSW joint are much higher than MIG joint (over 40%). Confirmation of high strength properties of FSW joint is the place of crack - beyond the weld in the native material.

Słowa kluczowe

EN

friction stir welding (FSW); aluminium alloys; joints; welding; mechanical properties; shipbuilding

• 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: 2013
• Tom: Vol. 20, No. 1
• Strony: 71--76
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Dudzik K.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel.:[phone], fax: [phone]

Bibliografia

• [1] Czechowski, M., Effect of anodic polarization on stress corrosion cracking of some aluminium alloys, Advances in Materials Science, Vol. 7, pp. 13-20, No. 1(11), 2007.
• [2] Czechowski, M., Low-cycle fatigue of friction stir welded Al-Mg alloys, Journal of Materials Processing Technology, 164-165, 1001-1006, 2005.
• [3] Czechowski, M., Własności złączy doczołowych blach ze stopów Al-Mg spajanych różnymi metodami, Materiały i Technologie, Politechnika Gdańska, Nr 1(1), Gdansk 2003.
• [4] Dudzik, K., Wpływ spawania na rozkład twardości w złączu spawanym na przykładzie stopu AW-7020, Zeszyty Naukowe Akademii Morskiej w Gdyni, nr 65, Gdynia 2011.
• [5] Dudzik, K., Czechowski, M., Analysis of possible shipbuilding application of Friction Stir Welding (FSW) method to joining elements made of AlZn5Mg1 alloy, Polish Maritime Research No. 4, 2009.
• [6] Ferraris, S, Volpone, L. M., Aluminium alloys in third millennium shipbuilding: materials, technologies, perspectives, The Fifth International Forum on Aluminium Ships, Tokyo, Japan 2005.
• [7] Pietras, A., Zadroga, L., Łomozik, M., Charakterystyka zgrzeiny utworzonej metodą zgrzewania z mieszaniem materiału zgrzeiny (FSW), Biuletyn Instytutu Spawalnictwa w Gliwicach, Nr 3, 2003.