Criteria such as welding positions, pipe diameter, thickness of Description. Available for Subscriptions. ð Þ. Personnel performing supervisory activities specified in this Section shall. Add to Alert. View the most recent version 4/Welder's Performance Qualification (WPQ) ASME Code Section IX A welder or welding operator is qualified by the manufacturer employing him under the requirements specified in QW This shall prove the manual skills of the welder to deposit sound weld metal. American Soc