The Paton Welding Journal, 2013, №07



2013 №07 (06)

2013 №07 (08)

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The Paton Welding Journal, 2013, #7, 44-49 pages

BRAZING FILLER METALS OF Ti-Zr-(Fe, Mn, Co) SYSTEM FOR BRAZING OF TITANIUM ALLOYS

V.F. KHORUNOV, S.V. MAKSYMOVA and V.V. VORONOV

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua


Abstract
Titanium alloys are perspective materials for different branches of industry. Appearance of new high-strength materials, in particular intermetallic alloys, provides for increasing interest to processes of their joining by brazing methods. Meanwhile, the most wide spread brazing filler metals (Ti-Cu-Ni and Ti-Zr-Cu-Ni systems) developed decades ago do not always correspond to current requirements, as, for example, in brazing of intermetallic alloys. Present work provides the results of complex investigations of brazing filler metals of Ti-Zr-Fe, Ti-Zr-Mn and Ti-Zr-Co systems using differential thermal analysis, light and scanning microscopy, X-ray microspectrum analysis. Data on melting ranges of pilot alloys were obtained, and liquidus surfaces of given systems using simplex-lattice method were build. Brazing filler metals covering brazing temperature range of current structural titanium materials based on solid solutions as well as intermetallics were proposed. Structure, chemical inhomogeniety and strength characteristics of brazed joints were studied. It is determined that brazing of solid solution based alloys (OT4, VT6) using indicated brazing filler metals ensures strength characteristics of joints, which are not inferior to that obtained with application of known brazing filler metals. Proposed brazing filler metals provide strength on the level of base metal at room and elevated temperature as well as in creep-rupture testing during brazing of g-TiAl intermetallic based alloy. 13 Ref., 4 Tables, 8 Figures.


Keywords: vacuum brazing, titanium alloys, intermetallic alloys, brazing filler metals, brazed joints, structure, strength of brazed joints


Received:                06.06.13
Published:                28.07.13


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