The Paton Welding Journal, 2013, №06



2013 №06 (08)

2013 №06 (01)

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The Paton Welding Journal, 2013, #6, 46-48 pages  

DISTRIBUTION OF CHEMICAL ELEMENTS IN THE ZONE OF ALUMINIUM ALLOY AMg6 TO TITANIUM ALLOY VT6 JOINTS PRODUCED BY DIFFUSION WELDING IN VACUUM

Yu.V. FALCHENKO, E.V. POLOVETSKY and L.M. KAPITANCHUK

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
The possibility of a combined use of titanium and aluminium alloys in the form of permanent joints is of high interest to many industries. However, no investigations involving evaluation of the effect of the diffusion welding process on distribution of chemical elements and microstructure of the welded joints have been conducted so far. As revealed by the metallographic examinations carried out in this study, magnesium during the welding process diffuses from alloy AMg6 to the zone of joining with alloy VT6 and accumulates in the contact region. An interlayer of aluminium AD1 was used to eliminate the negative effect of magnesium. A gradual decrease in the concentration of magnesium from AMg6 to AD1 was observed in the joining zone when using the aluminium interlayer. A region of diffusion interaction, in which titanium and vanadium diffused from VT6 to AD1, was detected in the AD1 + VT6 joining zone. It can be concluded from the investigation results that in vacuum diffusion welding of titanium alloys to aluminium alloys containing magnesium the use of the interlayer of pure aluminium provides the sound welded joints with a gradual distribution of magnesium in the joint. The main role in formation of the titanium alloy to interlayer joint is played by the processes of diffusion of titanium and vanadium in a direction of the interlayer. 7 Ref., 3 Figures.
 
 
Keywords: diffusion welding in vacuum, welded joint structure, distribution of chemical elements, diffusion, diffusion interaction zone
 
 
Received:                07.05.13
Published:               28.06.13
 
 
References
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2. Kazakov, N.F. (1976) Diffusion welding of metals. Moscow: Mashinostroenie.
3. Rabkin, D.M., Ryabov, V.R., Gurevich, S.M. (1976) Welding of dissimilar metals. Kiev: Tekhnika.
4. (1996) Constitutional diagrams of binary metal systems: Refer. Book. Vol. 1. Ed. by P. Lyakishev. Moscow: Mashinostroenie.
5. Grigorievsky, V.I. (1991) Diffusion welding of aluminium alloy AMg6 to titanium alloy OT4 through a composite titanium-aluminium interlayer. Svarochn. Proizvodstvo, 8, 2-4.
6. Toshio, E., Kenji, I., Toshiharu, M. (1978) Influence of intermediate inserts on properties of diffusion welded Al-Ti joints. J. JILM, 16(3), 107-114, 127.
7. Akiomi, K., Akihika, Y., Tashihiro, Y. et al. (1985) Diffusion welding of Ti-6Al-4V alloy with intermediate aluminium insert. J. JWS, 3(1), 145-151.

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