ABSTRACT
Welding of superalloys is mostly done by fusion welding techniques, but it results in severe deformation, coarse grain structure in the fusion zone and high residual stresses. To overcome these problems, solid-state welding is widely adopted in aerospace industries because metal joining in plasticizing stage also reduces fusion welding issues and provides finer grain structure in the nugget zone. Ti-6Al-4V is one of the most widely adapted titanium superalloys in aerospace applications because of its excellent strength-to-weight ratio. Linear friction welding (LFW) is advanced solid-state welding that is more reliable to join and repair blisk assembly in next-generation aero engines. To improve the joint efficiency of the Ti64 alloy through the effect of process parameters such as oscillating frequency, friction pressure, friction time, forging pressure, and forging time. The orthogonal optimization process has used to analyse the influences among the various process parameters. This investigation analysed the effect of oscillating frequency on mechanical and metallurgical properties of linear friction welded titanium alloy. It also results in a maximum joint efficiency of 96 %.
