The objectives of this course are to introduce to the students the theories, methods, and procedures of arc welding for steels. The practice course also includes training in arc welding for steels. With the objective of practices course, a training topic on the skill test of certified technician is presented. Students are expected to gain the occupational certification and will become their critical skill in the future employment. This course includes: (1) Safe practices, (2) Welding practices, (3) Cutting practices, (4) Joint geometry and welding symbols, (5) Steel properties and destructive testing, (6) Welding metallurgy of steels, (7) Discontinuities and defects of welds, (8) Visual Inspection of welds.