Joining technology refers to the process used in the permanent or temporary bonding of materials with each other. It is mainly used to assemble the products by uniting their component parts, as there are many products whose components are made earlier and assembled later. Joining technology is broadly divided into liquid-solid-state joining and mechanical joining. Techniques like welding, soldering, brazing and adhesive bonding fall under liquid-solid-state joining while mechanical joining encompasses bolts, nuts, fasteners and screws. Welding is a process in which heat, pressure or both are used to join two or more materials together. Some of the different types of welding are arc welding, gas welding, resistance welding, laser beam welding and ultrasonic welding. While understanding the long-term perspectives of the topics, the book makes an effort in highlighting their impact as a modern tool for the growth of this field. It will also provide interesting topics for research which interested readers can take up. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.