The Paton Welding Journal, 2015, №08



2015 №08 (02)

DOI of Article 10.15407/tpwj2015.08.03

2015 №08 (04)

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The Paton Welding Journal, 2015, #8, 14-17 pages
 

Structure and properties of EB- and TIG-welded joints of high-strength two-phase titanium alloys

S.V. Akhonin, V.Yu. Belous, R.V. Selin, I.K. Petrichenko And E.L. Vrzhizhevsky

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific strength. The thermal cycle of welding results in change of structures of weld and HAZ metal and also in deterioration of mechanical characteristics of the joint. In the work the properties of welded joints of titanium alloys VT23, T110 and high-alloyed alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, produced using electron beam and argon arc welding, were evaluated. In weld and HAZ metal of the TIG-welded joints of alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, the structure is formed with a predominance of metastable b-phase and low values of strength and impact toughness, the joints require postweld high-temperature annealing at temperature of not less than 900 °C. The joints of VT23 alloy have high values of strength and impact toughness. High-strength titanium alloy T110 is characterized by good weldability in EBW and TIG welding, has high values of impact toughness of weld metal and HAZ after annealing, the strength of welded joints is at the level of 0.9 of base metal strength. 7 Ref., 2 Tables, 4 Figures.
 
Keywords: titanium alloys, tungsten-electrode argon-arc welding, electron beam welding, properties
 
Received:                28.05.15
Published:               13.10.15
 
 
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