Evaluation of Mechanical Behaviour of Friction Welded Bimetallic Welds

Abstract

Friction welding is a solid state joining process that uses rotational motion and high axial pressure to convert rotational energy into frictional heat at a circular interface. For this purpose a friction welding setup was designed. Vertical Milling Machine was used for friction welding. The materials used were Mild Steel and Stainless Steel - 304. The Piezoelectric Dynamometer was used to plot the graphs of forces & Pressure Gauge was used to control the friction force & forge force. Thermocouple & Digital thermometer were used to note down the temperature produced during friction welding. A Dial indicator was used to control the burn off length. Four parameters were varied Friction force, Forge force, RPM & Burn off length at two different levels. Fixed parameters were length and diameter of the specimen. Total number of experiments conducted was sixteen. For each experiment four specimens were made. After friction welding Macroscopic behaviour (Tensile Strength, Temperature produced during friction welding & Composition change) & Microscopic behaviour (Microstructure, Micro hardness, SEM & XRD) of the welded region was analyzed. An attempt to relate the Microscopic and Macroscopic behaviour with the friction welding parameters was made in this work.