Fractography analysis of AW-7020 alloy joints welded by FSW

• Autorzy: Dudzik K. , Charchalis A.

Identyfikatory

DOI

10.5604/12314005.1134119

• Języki publikacji: EN

Abstrakty

EN

Technology development of Friction Stir Welding (FSW) method for joining AW-7020 aluminum alloy elements was described. Two kinds of tools were used during research: with a regular pin and with a „TRI-FLUTE” pin. Tools were with different dimensions and the following parameters changed mandrel’s rotary speed Vn [rev/min], welding speed Vz [mm/min], angle of tool deflection αz [o]. The thickness of the joining sheets was g = 12 mm. The sheets were one side milled to a thickness of 10 mm in the contact portion. Samples were tested by Charpy impact strength according to PN-EN ISO 148-1:2010. After these tests, the samples were analysed by means of fractographic examination. The tests were made with using a scanning electron microscope (SEM) Philips XL-30. The analysis has shown that there is the influence of the joining parameters and chosen tools for the possibility of occurrence welding defects in joints. Welding defects detected in the structure of joints after impact studies were: incomplete fusion, separations dissection, and cracks. During the development of friction stir welding technology, the best results, in terms of structure homogeneity and the absence of welding defects, were achieved for the tool with TRI-FLUTE pin and joining parameters: Vn = 450 rev/min, Vz = 180 mm/min, αz = 88.5 °.

Słowa kluczowe

EN

friction stir welding (FSW); aluminum alloys; welding; fractography; scanning electron microscopy

• 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: 2014
• Tom: Vol. 21, No. 1
• Strony: 67--74
• Opis fizyczny: Bivbliogr. 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]

autor

Charchalis A.

• 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 aluminum alloys, Advances in Materials Science, Vol. 7, No. 1(11), pp. 13-20, 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 złaczy doczołowych blach ze stopow Al-Mg spajanych różnymi metodami, Materiały i Technologie, Politechnika Gdańska, Nr 1(1), Gdańsk 2003.
• [4] Dudzik, K., Influence of joining method for mechanical properties of 7020 aluminum alloy joints, Journal of KONES Powertrain and Transport, Vol. 20, No. 1, pp. 71-76, Jurata 2013.
• [5] Dudzik, K., Charchalis, A., Influence of Friction Stir Welding on Hardness Distribution in Joints of AlZn5Mg1 Alloy, Solid State Phenomena, Trans Tech Publications, Mechatronic Systems and Materials V, pp. 430-435, Switzerland 2013.
• [6] 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.
• [7] Dudzik, K., Czechowski, M., The properties of AlZn5Mg1 (AW-7020) alloys welded by new technology friction stir welding, Journal of KONES Powertrain and Transport, Vol. 15, No. 3, Warszawa 2008.