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Numerical simulation of filler metal droplets spreading in laser brazing

Chinese Optics Letters 2007年第11期5卷 654-656页

作者：陈彦宾封小松李俐群 State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001

A finite element model was constructed using a commercial software Fidap to analyze the Cu-base filler metal droplet spreading process in laser brazing, in which the temperature distribution, droplet geometry, and fluid flow velocity were calculated. Marangoni and buoyancy convection and gravity force were considered, and the effects of laser power and spot size on the spreading process were evaluated. Special attention was focused on the free surface of the droplet, which determines the profile of the brazing spot. The simulated results indicate that surface tension is the dominant flow driving force and laser spot size determines the droplet spreading domain.

关键词： brazing filler metals Buoyancy Computer simulation Finite element method Flow velocity Surface tension Temperature distribution

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New filler metal systems for the brazing of titanium alloys

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China Welding 2015年第3期24卷 1-5页

作者： V. F. Khorunov S. V. Maksymova V. V. Voronov E.O.Paton Electric Welding Institute NASU 11 Bozhenko Str.03680KievUkraine

It＇ s well known welding takes the leading role in development of titanium structures. However, in number of cases technological processes of brazing are more appropriate and, sometimes, being the single possible, in particular, during production of multilayer thin-wall structures. It should be noted that brazing filler metals of Ti-Cu-Ni, Ti-Zr-Cu-Ni, Zr-Ti-Ni and Cu-Zr-Ti systems in a form of plastic foils, as well as in powder form are mainly used in world practice for brazing of titanium 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 liquidas su^Caces 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 fiUer metals ensures strength characteristics of joints, which are not inferior to that obtained with application of known brazing filler metals even if they are received at lower brazing temperature.

关键词： vacuum brazing titanium alloys inter-metallic alloys brazing filler metals brazed joints structure,strength of brazed joints

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