Automatic Welding, 2018, №03



2018 №03 (03)

DOI of Article 10.15407/as2018.03.04

2018 №03 (05)

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Avtomaticheskaya Svarka (Automatic Welding), № 3, 2018, pp. 23-28

Influence of rare-earth elements on structure and properties of welds of titanium alloy VT22

S.L. Schwab, I.K. Petrychenko, S.V. Akhonin

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
 
 
The article presents the results of investigations of influence of rare-earth metal fluorides on structural changes in the metal of a titanium alloy VT22 for the purpose of using them in the flux filler of an experimental flux-cored wire for welding this alloy. It was shown that in welds made by argon-arc welding on VT22 alloy along the flux consisting of fluorides of rare-earth metals, the refinement of β-grains is observed. The introduction of LaF3 into the core of the experimental flux-cored titanium wire PPT-22 in combination with heat treatment allowed increasing the impact toughness of welds in argon-arc welding of VT22 alloy by 2 times — to 30.6 J/cm². 8 Ref., 4 Tabl., 5 Fig.
 
Keywords: titanium alloy VT22, rare-earth metals fluorides, flux-cored wire
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