This specification applies to the fabrication, by welding, of wrought or cast material used to manufacture rotating elements of equipment such as fans, pumps, compressors, and centrifuges for power generation, propulsion, and material processing. These rotation elements have a link of similarity that is shape more than application e.g., round shapes from a few inches to 200 inches in diameter, with a variety of uses. Includes a particularly useful table, Grouping of Base Metals for Procedure Qualification. ANSI Approved