The invation was made to increase our physical capacity to work by use of device which increases momentum, potential, kinetic energy. Through this device we have seen the development of air ways, Airplane, automobile, roads, bridges, etc. The development of each of these techlogies goes in parallel with the development of welding Techlogy. Welding is the process of uniting pieces of metal (similar or dissimilar) by fusion accomplished by the different welding process. This book is prepared to enhance the theoretical and practical skill of the trainees and technicians in basic welding course.