Many engineered products use welding as one of the fabrication methods to fasten parts permanently. Structures such as bridges and buildings have welded steel components. Parts for mechanical devices, such as automobiles and aircraft, are also fabricated using welding. In technical drawings, the welding of parts must be specified by standard ANSI and American Welding Society (AWS) symbols. This chapter describes the different welding processes, the various types of welded joints, and the symbols used to specify welded joints on technical drawings.