The Paton Welding Journal, 2021, №08



2021 №08 (05)

DOI of Article 10.37434/tpwj2021.08.06

2021 №08 (07)

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The Paton Welding Journal, 2021, #8, 27-32 pages

Structure and mechanical properties of 2219-t87 aluminium alloy joints produced by flash butt welding

S.I. Kuchuk-Yatsenko, K.V. Hushchyn, I.V. Ziakhor, S.M. Samotryasov, M.S. Zavertannyi and A.M. Levchuk

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
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 post heat treatment of large-sized products. In the work the formation of joints of thermomechanically strengthened 2219-T87 alloy during flash butt welding was investigated. It was found that a low-temperature resistance heating in combination with a shortterm heating by flashing provide the formation of defect-free welded joints. Metallographic examinations showed that joints are formed through a thin layer of melt, which is a necessary condition for a high-quality welding of aluminium alloys. The influence 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 θʹ-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 Tables, 7 Figures.
Keywords: 2219 aluminium alloy, flash butt welding, welded joint, mechanical properties

Received 05.07.2021

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Suggested Citation

S.I. Kuchuk-Yatsenko, K.V. Hushchyn, I.V. Ziakhor, S.M. Samotryasov, M.S. Zavertannyi and A.M. Levchuk (2021) Structure and mechanical properties of 2219-t87 aluminium alloy joints produced by flash butt welding. The Paton Welding J., 08, 27-32.

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