The Influence of Joint Geometry on the Interface Properties of Friction Welded Dissimilar Materials

Fiction welding is widespread used in various industries nowadays. Friction welding is a complicated process, which involves the interaction of thermal, mechanical and metallurgical phenomenon. In friction welding heat is generated by conversion of mechanical energy to thermal energy at the interface of the work pieces during rotation under pressure. The welding of dissimilar materials is generally more challenging than that of similar materials due to differences in physical, chemical, and material properties of base materials. In the present study Stainless steel and mild steel, with three different joint geometries (1.Flat Face to Flat Face 2.Pin with shoulder and 3.Taper pin with shoulder) are welded by direct drive friction welding to investigate the influence of joint geometry on the interface properties of friction welded components. Friction welding was conducted using KUKA direct drive (Germany) weld joint. The integrity of weld is investigated by analyzing the microstructure. The mechanical properties are determined by tensile test, and hardness test. Taper Pin with shoulder joint geometry has shown superior integrity and mechanical properties. The microstructure of Taper Pin with shoulder has shown excellent flow and mixing of stainless steel and mild steel resulting in higher tensile strength.