Braze Welding TIG of Titanium and Aluminium Alloy Type Al – Mg

Abstract

Braze weldIng TIg of TITanIum and alumInIum alloy Type al -mgThe article presents the course and the results of technological tests related to TIG-based arc braze welding of titanium and AW-5754 (AlMg3) aluminium alloy. The tests involved the use of an aluminium filler metal (Al99.5) and two filler metals based on Al-Si alloys (AlSi5 and AlSi12). Braze welded joints underwent tensile tests, metallographic examinations using a light microscope as well as structural examinations involving the use of a scanning electron microscope and an X-ray energy dispersive spectrometer (eDS). The highest strength and quality of welds was obtained when the Al99.5 filler metal was used in a braze welding process. The tests enabled the development of the most convenient braze welding conditions and parameters.

Recent Advances in Brazing Fillers for Joining of Dissimilar Materials

“…Joining of a Ti skin to Al honeycomb structures in aviation industries is necessary to produce a balanced set of properties (lightweight Al and high stiffness Ti skin) [26]. Therefore, knowledge of interfaces is of paramount importance in airplanes for safety reasons [27]. Takemoto et al [28] investigated the joining of Al to Ti using an Al-based brazing alloy.…”

Brazing filler metals

“…For example, the joining of titanium (predominately Ti-6Al-4 V due to its aerospace applications) to aluminium (of various alloy specifications including 5A06 [30], A6061-T6 [31] and 5052 [32]) is of interest in aviation for hybrid structures (for example, aluminium honeycomb joined to a titanium skin [33]). Safe use of these hybrid structures demands extensive knowledge and control of the reactions that occur during joining [34]. Takemoto & Okamoto [35] found that the addition of silicon to Al based filler metals used to braze Al to Ti markedly reduced the interfacial zone width without significantly reducing the length of gap filled, up to 10at%Si where Ti 7-Al 5 Si 12 formed at the interface.…”