Answer Happy

141. What are the advantages and disadvantages of welding compared to other types of assembly operations? 142. What were the two discoveries of Sir Humphrey Davy that led to the development of modern welding technology? 143. What is meant by the term faying surface? 144. Define the term fusion weld. 145. What is the fundamental difference between a fusion weld and a solid - state weld? 146. What is an autogenous weld? 147. Discuss the reasons why most welding operations are inherently dangerous. 148. What is the difference between machine welding and automatic welding? 149. Name and sketch the five joint types. 150. Define and sketch a fillet weld. 151. Define and sketch a groove weld.