Dissimilar joining of Titanium alloy to Aluminium using Al-Si based filler alloy by vacuum brazing technique

Abstract

In the present investigation, a dissimilar metal joint between Titanium alloy (Ti6Al4V, ELI) and pure Aluminium (Al) was achieved using an Al-Si based filler alloy by vacuum brazing technique. A sound dissimilar joint of Ti to Al was achieved after a series of pilot experiments with overlap configuration. A thin foil of 0.2 mm thick Al-Si was used as filler alloy. With an overlap of 7.5 mm, the average joint strength achieved was 64 MPa. Mechanical properties were evaluated by varying the overlaps of the vacuum brazed joints and then compared. The average joint strength achieved for an overlap distance of 3, 6 and 9 mm were 57 ± 0.5, 53 ± 0.5 and 59 ± 0.5 MPa, respectively. The brazed joints were investigated for macrostructure, microstructure, scanning electron microscope and electron probe micro analyser analysis for characterization studies.

Research on the Capillary Filling Behavior of Liquid Solder Al-12Si under the Action of Electromagnetic Ultrasonic Wave

“…( ) 00 sin 2 us P P f t t P  =  − +    (12) According to Equation (12), it could be concluded that the sound pressure gradient changed with time, so it could explain why the liquid solder had an instantaneous process of repeated forward and contraction motion during the CF process. According to Equation (10), it could be concluded that if the liquid layer moved in the X direction, the sound pressure gradient satisfied the following equation:…”

“…Vacuum brazing is a welding method in which the brazing filler metal is melted by heating in a vacuum or inert gas environment, so that it penetrates into the surface of the base metal and solidifies, and finally forms a solid connection. Due to the advantages of high quality and strong corrosion resistance, the welded joints prepared by this method have received extensive attention in recent years [9,10]. Ma et al [11] inserted a 3D-SiO2 fiber interlayer between SiC and TC4 alloy (with a nominal composition of Ti-6Al-4V), and then performed vacuum brazing.…”