The Paton Welding Journal, 2021, №05



2021 №05 (04)

DOI of Article 10.37434/tpwj2021.05.05

2021 №05 (06)

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The Paton Welding Journal, 2021, #5, 30-34 pages

Argon-arc welding of high-strength sparsely-doped pseudo-β-titanium alloy Ti–2.8Al–5.1Mo–4.9Fe

S.V. Akhonin, V.Yu. Bilous, R.V. Selin, I.K. Petrychenko and L.M. Radchenko

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

Abstract
Structural sparsely-doped titanium alloys are developed with the purpose of lowering the finished product cost. Possibility of application of tungsten electrode argon-arc welding (AAW) for sparsely-doped pseudo-β-titanium alloy Ti–2.8Al–5.1Mo–4.9Fe was evaluated. Influence of different kinds of argon-arc welding on weld formation and mechanical properties of Ti–2.8Al–5.1Mo–4.9Fe alloy joints were assessed. The effect of through penetration AAW, semi-submerged AAW, AAW with feeding unalloyed titanium welding filler wire VT1-00sv was studied. It was found that the structure of metal of the weld and HAZ in welded joints of sparsely-doped titanium alloy Ti–2.8Al–5.1Mo– 4.9Fe made by AAW consists mainly of β-phase with precipitates of metastable α-phase. Lowering of AAW heat input for Ti–2.8Al–5.1Mo–4.9Fe alloy has a positive impact on the joint strength. So, among the welded joints made without changing the weld metal composition, the joints produced by semi-submerged arc welding have the highest strength of 972 MPa and the highest impact toughness on the level of 5.7 J/cm2. 15 Ref., 3 Tables, 3 Figures.
Keywords: titanium, titanium alloys, argon-arc welding, heat input, flux, wire, mechanical properties

Received 16.04.2021

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