Introduction

Friction welding is one of the effective joining techniques in industry. Friction welding is the solid state welding and it offers an alternative welding process for the joining the parts in particular electrical appliances, engine parts, etc. The welding takes place when two surfaces, subjected to the joining, get in mechanical contact and the surfaces are heated to the desired temperature through frictional heat generation and, later, a forging pressure is introduced to weld the parts. In the present chapter, introduction to friction welding is presented and the welding mechanisms are described.