Influence of filler metal on structure and properties of welded joints of high-strength two-phase titanium alloys produced using argon arc welding

Abstract

The welded joints of high-strength titanium alloys, produced using arc welding, have, as a rule, unsatisfactory values of mechanical properties, especially those of ductility in the as-welded state as compared to the base metal. In the work the effect of thermal welding cycle, type of filler metal and the post-weld heat treatment on the structure and properties of welded joints of two-phase high-alloyed titanium alloys having σ t > 1000 MPa, were evaluated. The properties and structure of welded joints of high-strength titanium alloys VT23, T110 and experimental alloy Ti-6.5A1-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, made by argon arc welding applying the filler wires, differing by their composition from the base metal, were studied. It is rational to produce the joints of complex-alloyed titanium alloy Ti-6.5A1-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr using argon arc welding applying filler wire VT1-00sv at modes, providing the through penetration and the content of wire components in the weld metal at level of 10 % in combination with the subsequent high-temperature annealing. 6 Ref., 1 Table, 6 Figures. K e y w o r d s : titanium alloys, argon arc welding, filler wire, properties, structure

Structure and Properties of High-Strength Titanium Alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr Welded Joints

“…To compare the properties of the highly-alloyed T120 alloy (Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr) welded joints, three types of welded joints were obtained by TIG welding [61] with different heat input without the use of filler materials and with a decreased degree of alloying elements in the weld metal via addition of technically pure titanium as a filler wire. The applied titanium wire from unalloyed titanium of VT1-00 grade with a diameter of 2 mm at a feed speed of 60 m/h allows adding a filler wire in an amount of 20...30% of the weld volume, which has been confirmed by the study of the weld metal macrostructure [32]. The joints of the high-strength titanium alloy VT23 and the titanium alloy T110 were made by TIG welding without the use of filler materials.…”

“…Currently, more and more attention is paid to the expansion in welded structures and assemblies of high strength titanium alloys use (UTS ≥ 1100 MPa) [29][30][31][32][33][34][35]. The weldability of two-phase highalloyed titanium alloys, the use of which can provide a big reduction in structural weight, is significantly worse than low-alloyed alloys, therefore for a new alloy it is necessary to ensure the possibility of obtaining welded joints with a strength of at least 90% compared to the strength of base material.…”

Effect of TIG-Welding on the Structure and Mechanical Properties of the Pseudo-β Titanium Alloy VT19 Welded Joints

“…Both joints with 6 mm thickness were put together as stated in work [17] were performed with and without the filler wire. As the filler metal, unalloyed titanium welding wire VT1-00sv was used with 2 mm in diameter.…”