The following links are for the Official Syllabi (official course descriptions) for each of the required courses. They explain the objectives and methods of each of the courses.
WLD141 Gas and Beginning Arc Welding
WLD142 Advanced Arc Welding
WLD243 Gas Metal Arc Welding
WLD244 Gas Tungsten Arc Welding (TIG)
WLD245 Advanced Welding Techniques I
WLD246 Advanced Welding Techniques II