| 2021 №08 (06) |
DOI of Article 10.37434/as2021.08.07 |
2021 №08 (08) |
Avtomaticheskaya Svarka (Automatic Welding), #8, 2021, pp. 35-40
Structure and mechanical properties of 2219-T87 aluminum alloy joints produced by flash butt welding
S.І. Kuchuk-Yatsenko, K.V. Hushchyn, I.V. Ziakhor, S.M. Samotryasov, M.S. Zavertannyi, A.M. Levchuk
E.O. Paton Electric Welding Institute. 11 Kazymyr Malevych Str., 03150 Kyiv, Ukraine. E-mail: office@paton.kiev.ua
During designing and manufacture of aircraft structures from modern thermomechanically strengthened aluminium alloys, there is a problem of producing welded joints with satisfactory mechanical properties without further heat treatment of large-sized products. In the work the formation of joints of thermomechanically strengthened 2219-T87 alloy during fl ash butt welding was investigated. It was found that a low-temperature resistance heating in combination with a short-term heating by fl ashing provide the formation of defect-free welded joints. Metallographic examinations showed that the joints are formed through a thin layer of melt, which is a necessary condition for a high-quality welding of aluminium alloys. The infl uence of intense plastic deformation during upsetting with a forced formation on the morphology of θ-phase (CuAl2) particles was studied. A decrease in the values of hardness in the joint area as a result of dissolution and coagulation of a strengthening θ`-phase was established. The strength of welded joints both along and across the rolled metal lines amounts to 76 % of the strength of the base metal. 20 Ref., 2 Tabl., 7 Fig.
Keywords: aluminium 2219 alloy, fl ash butt welding, welded joint, mechanical properties.
Received: 05.07.2021
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