Avtomaticheskaya Svarka (Automatic Welding), # 7, 2018, pp. 12-17
Electron beam welding and heat treatment of welded joints of high-strength pseudo-β-titanium alloy VT19
S.V. Akhonin, V.Yu. Belous, R.V. Selin, E.L. Vrzhyzhevsky, I.K. Petrichenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine.
Titanium pseudo-β alloys have high strength reaching 1200-1400 MPa in aged state as well as high fabricability in comparison with alloys with pseudo-α or (α+β) structure. Such advantages of pseudo-β-titanium alloys, typical representative of which is high-alloy VT19, make this class of titanium alloys perspective for application in new equipment and during modernization of existing one. The paper has studied the effect of mode of electron beam welding, modes of pre-heating and local heat treatment as well as furnace annealing on properties of welded joints of pseudo-β-titanium alloy VT19 produced by electron beam welding. Variation of rate of electron beam welding of alloy VT19 does not allow changing relation between α- and β-phases within the significant limits in weld metal and heat affected zone. Electron beam welding in combination with pre-heating allows regulating the relation between α- and β-phases in welded joint metal and reduce content of β-phase in weld metal of alloy VT19 from 91 to 53% as well as rise strength of welded joints from 876 to 937 MPa. 11 Ref. , 2 Tabl., 6 Fig.
titanium, titanium alloys, pseudo-β-titanium alloys, electron beam welding, structure, properties, local heat treatment, annealing, strength
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