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    Wyświetlanie 1-3 z 3
    Tytuł:
    Mechanical properties of 5083, 5059 and 7020 aluminium alloys and their joints welded by FSW
    Autorzy:
    Dudzik, K.
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246888.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    friction stir welding (FSW)
    aluminium alloys
    joints
    welding
    mechanical properties
    shipbuilding
    Opis:
    The article presents the research results on the mechanical properties of aluminum alloy 7020 and its friction stir welded (FSW) joints. For comparison alloy 5083 – the most currently used in shipbuilding alloy was chosen as well as 5059 - the new high-strength alloy. Besides the native material alloys there were investigated their joints welded by FSW - the same method as alloy 7020. Welding parameters used for the connection of the sheets made of 7020, 5083 and 5059 alloys 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 i.e. MIG or TIG. The research was carried out using a static tensile test in accordance with the requirements of the Polish Standards PNEN 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. The 7020 alloy has higher strength properties then alloys: 5083 and 5059. The yield stress is higher by 14.8% compared to 5083 alloy, and by 11.7% compared to the alloy 5059. Plastic properties of an alloy 7020 are the lowest, but with reserves meet the requirements of classification societies. The joints welded by FSW of 7020 alloy have higher strength properties then joints of alloys: 5083 and 5059. The yield stress achieves the highest value for alloy 7020 and is 24.2% higher than for 5083 alloy and 11.5% for the 5059 alloy. Despite the strength properties also plastic properties are best for 7020 alloy joints.
    Źródło:
    Journal of KONES; 2013, 20, 2; 69-73
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractography analysis of AW-7020 alloy joints welded by FSW
    Autorzy:
    Dudzik, K.
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/244221.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    friction stir welding (FSW)
    aluminum alloys
    welding
    fractography
    scanning electron microscopy
    Opis:
    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 °.
    Źródło:
    Journal of KONES; 2014, 21, 1; 67-74
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscopic examination of AlZn5Mg1 alloy joints welded by FSW and MIG
    Autorzy:
    Dudzik, K.
    Charchalis, A.
    Jurczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/247908.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    microscopic examination
    aluminium alloys
    friction stir welding (FSW)
    MIG welding
    grain size
    Opis:
    The article presents the research results of microscopic examination of friction stir welded joint (FSW) alloy AW 7020 (AlZn5Mg1). The joints welded by traditional MIG method of the same aluminium alloy were chosen as reference points. Friction stir welding (FSW) - a new technology can be successfully used for butt welding of sheet metal with different types of aluminium alloys. The parameters of friction stir welding (FSW) and MIG welding used to join metal alloy AlZn5Mg1 (7020) were presented. Welds made using both the FSW and MIG method were checked using X-ray flaw detection and showed no welding defects. In order to determine the structural changes in the bonded joints, the samples were polished and then microetched KELLER reagent. Metallographic examination was carried out using optical microscope Axiovert ZAISS 25. To determine the grain size in the different zones of joints welded by FSW and MIG methods AxioVision 4.8.2 software was used. Metallographic examination revealed the existence of an explicit heat affected zone of HAZ in case of MIG welded joints and virtually lack thereof, in case of FSW welded joints. Microscopic examination of AlZn5Mg1 alloy joints showed that the structure of the FSW welded joint is more homogeneous than the MIG welded joint. The analysis of the grain size of the characteristic zones of joints shows that in the case of joints welded by FSW the weld nugget has smaller grains than the native material. In case of the joint welded by traditional MIG method the biggest grains are in HAZ and the smallest in the native material.
    Źródło:
    Journal of KONES; 2012, 19, 2; 129-135
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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