Browsing by Author "Barreda, J. L."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item Electron beam welded high thickness Ti6Al4V plates using filler metal of similar and different composition to the base plate(2001-06-15) Barreda, J. L.; Santamaría, F.; Azpiroz, X.; Irisarri, A. M.; Varona, J. M.; EXTREMAT; Tecnalia Research & InnovationCompositional changes of the welds carried out by the electron beam welding process have been investigated in the present work. Addition of a filler metal in the weld fusion zone has been used to solve some problems by improving the behaviour of the joint by minimising either the porosity, the notching or the cracking susceptibility of the joint (Sanderson et al., Met. Constr. Br. Weld. J. (1972); Atsuta et al. 3er CISFFEL, Lion, Francia, September 1983; Nazarenko and Kaidalov, Technological procedures of electron beam welding and repair; Murphy and Turner, Weld. J. (1976)). Filler metal can also be used to weld high thickness plates by low-power electron beam welders (Ruge and Oestmann et al., Decker. Electron and Laser Beam Welding, 11W, 1976). The main purpose of this work is to investigate the behaviour of a 17 mm Ti6Al4V weld by the electron beam welding process with a filler metal of similar and dissimilar composition to the base plate. In the present work the initial results of 17 mm thickness Ti6Al4V plates welded with a 3kWEB welder and a filler metal of titanium alloy of the same and different composition to the base metal are presented.Item Influence of the filler metal on the mechanical properties of Ti-6Al-4V electron beam weldments(2010-07-23) Barreda, J. L.; Azpiroz, X.; Irisarri, A. M.; EXTREMAT; Tecnalia Research & InnovationThe influence of various filler metals on the mechanical properties of 17 mm thick Ti-6Al-4V electron beam welded joints has been analysed. Autogeneous welded joints exhibit higher toughness when compared to the parent plate but this improvement was less marked than that observed in plasma arc welded joints. To achieve better toughness, without suffering unacceptable losses of strength, different morphologies of commercially pure titanium filler metals have been employed. Using 0.50 mm thick sheet as filler metal leaded to maximum toughness but as counterpart a significant decrease in strength was observed. To obtain high toughness while maintaining a high strength level 0.25 mm sheet and 1 mm diameter filler metals are recommended. Fractographic examination of the failed specimens helped to explain the fracture behaviour of the different welded joints.Item Influence of the filler metal on the properties of Ti-6Al-4V electron beam weldments. Part I: Welding procedures and microstructural characterization(2009-11-05) Irisarri, A. M.; Barreda, J. L.; Azpiroz, X.; Tecnalia Research & Innovation; EXTREMATThe use of different procedures for electron beam welding of 17 mm thick Ti-6Al-4V plate and the difficulties found in this process are analysed. When this alloy was welded autogeneously the presence of significant amounts of α martensite was observed, recommending looking for another solution. In the early trials a V joint design was used but distortions and defects were detected in the welds when multi-pass procedures were considered. Consequently, for the remaining weldments K or I joint configurations were selected. Initially, Ti-6Al-4V wire was preferred in order to match mechanical properties with base material but no significant improvement was found leading to consideration of using a less alloyed filler metal. Different commercially pure titanium filler metals have been employed to optimise the performance of the fusion zone of electron beam weldments. In a second paper [1] the influence of the welding procedure on the mechanical properties of the various joints will be discussed.