The coding system is governed primarily by the and the American Society of Mechanical Engineers (ASME) . While there are slight variations in naming conventions between pipe and plate, the logic remains consistent:
These apply to butt joints, beveled plates, or pipe. welding position chart
According to AWS D1.1 and ASME Section IX codes, a welder is only qualified to weld within the range of positions they tested for. The coding system is governed primarily by the