In the world of welding, preparation of WPS and Qualification of Welders are very important. In the fabrication of any coded work such as structrual steel (which is under AWS D1.1 Code), Piping (under ANSI B31.1 or B31.3) Pipelines (under API 1104 or B31.8), Pressure Vessel (under ASME VIII Div.1), and Storage Tanks (under API 650), by right, you cannot start any welding works unless you have an approved WPS and a Qualified Welders. 210 more words