The Paton Welding Journal, 2023, #9, 38-42 pages
Diffusion welding of magnesium alloy МА2-1 through a zinc interlayer
Yu.V. Falchenko, L.V. Petrushynets, V.Ie. Fedorchuk, V.A. Kostin, O.L. Puzrin
E.O. Paton Electric Welding Institute of the NASU..
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: falchenko@paton.kiev.ua
Abstract
The paper gives the results of investigations on vacuum diffusion welding of МА2-1 magnesium alloy. Different technological
measures were used in welding: unsupported welding, welding with application of forming matrices, welding without interlayers
and with a zinc interlayer. It is found that it is not possible to produce the joint in unsupported welding without an interlayer at
400 °С temperature and process duration less than 60 min. Increase of welding temperature or time leads to considerable grain
growth. Application of 250 ~m zinc interlayer and of the following welding mode: Т = 320 ºС, Р = 10 MPa, t = 30 min allows
producing the joint. Analysis of chemical composition in different areas of the joint zone shows that development of diffusion
processes in the butt during welding results in pore formation with magnesium content on the level of 17.8 – 20.12 wt. % in the
zinc interlayer at 2 – 3 ~m distance from magnesium/zinc contact line. In the central part of the joint zone the metal chemical
composition is close to pure zinc composition. Application of forming matrices and an interlayer of zinc in the solid-liquid
state in welding in the following mode: Т = 340 ºС, Р = 10 MPa, t = 30 min. allows producing sound joints due to localisation
of plastic deformation in the butt joint. Results of metallographic investigations showed formation in the butt joint of common
grains and remains of the interlayer in the form of dispersed particles of 15…50 ~m size, with chemical composition of
Mg–4.53Al–0.20Mn–63.49Zn, wt. %, having an irregular elongated shape.
Keywords: vacuum diffusion welding, magnesium alloy, interlayer, microstructure, microhardness
Received: 05.07.2023
Accepted: 09.10.2023
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Suggested Citation
Yu.V. Falchenko, L.V. Petrushynets, V.Ie. Fedorchuk, V.A. Kostin, O.L. Puzrin (2023) Diffusion welding of magnesium alloy МА2-1 through a zinc interlayer.
The Paton Welding J., 09, 38-42.