DEVELOPMENT OF ALLOY AND SUPERALLOY LARGE SHAFTS BY FRICTION WELDING PROCESS

The aim of this study is to examine the process parameters of superalloy and alloy steel inertia welding using FE simulation and to evaluate the mechanical properties of a welded joint FE simulation was carried out to optimize the inertia welding process parameters. Disk of rotor shaft and head of exhaust valve spindle are made by the hot closed die forging. Dissimilar inertia welding for large exhaust valve spindle manufacturing composed of the Nimonic 80A valve head of 540mm diameter and the SNCrW valve stem of 115mm diameter, and for large rotor shaft manufacturing composed of the 310mm diameter disk and the 140mm diameter shaft were carried out with optimal process parameter conditions obtained simulation result. Inertia friction welded joint part was joined by inertia friction welder, MTI model 400. Mechanical and metallurgical properties of welded joints were evaluated by using microstructure, tensile, hardness and fatigue tests.