Mechanical Properties of Electron Beam Welded Joint in Solution Treated and Aged Ti-6Al-4V Alloy

Abstract

The influence of the electron beam welding conditions on the mechanical properties of the welded joint in a solution treated and aged Ti-6Al-4V alloy having a tensile strength of 115 kgf/mm² has been studied.
The strength of welded joint is equal to that of base metal below the welding heat input of 6 600J/cm. Above this heat input, the strength of the joint is lower than that of base metal, but the strength is not reduced lower than 110 kgf/mm² in the highest heat input studied. The decrease in the strength of the joint is a result of the decrease of the strength of weld metal, which decreases gradually with the increase in the heat input. As the heat input decreases, the toughness and ductility in weld metal slightly decrease, but the fracture toughness is higher than that of base metal even in the lowest heat input studied. In conclusion, it was found that the solution treated and aged Ti-6Al-4V alloy had the good electron bearm weld-ability.