Abstract
This paper presents an investigation of rotary friction welding of 25.4 mm diameter Ti‐6Al‐4V rods. The weld process
parameters used for this research were rotational speed, axial pressure and forging time. Only relative speed and
axial pressure were the varied parameters while the forging time was kept constant. The mechanical properties of
the weld joints were analysed and characterized. The results showed that the rotational speed and friction pressure
have significant influence on the tensile strength, microstructure and weld integrity. As rotational speed increased
heating time also increased in the weld, as a result, greater volume of material was affected by heat resulting in a
wider width of the weld joint. Fine microstructure resulted due to an increased rotational speed and frictional
pressure respectively. The oxidation and discolouration of welds were also discussed.