Carbon-manganese steels (common structural and pressure vessel steels). P-No. 4: Low-alloy steels with chromium and molybdenum.
The WPS is a written document that provides direction to the welder for making production welds in accordance with Code requirements. It acts as a "recipe" and lists all essential, nonessential, and supplementary essential variables for each welding process used. Procedure Qualification Record (PQR)
: Standards for Power Piping and Process Piping . [Source: LTJ Industrial ] welding standard asme
To simplify the qualification process, ASME groups thousands of base metals and filler metals into alphanumeric classification systems based on weldability, composition, and mechanical characteristics. This prevents shops from having to run a separate PQR for every specific brand of steel. P-Numbers (Base Metals)
Austenitic stainless steels (e.g., Grade 304, 316). F-Numbers (Filler Metals) The WPS is a written document that provides
No discussion of the is complete without the AI. For any ASME-stamped product, a third-party AI must:
To reduce the logistical nightmare of requiring a separate qualification for every single type of commercial metal and filler wire, ASME Section IX introduces grouping systems based on material characteristics. P-Numbers (Base Metals) [Source: LTJ Industrial ] To simplify the qualification
Qualify a WPS for root pass GTAW (ER70S-2) and fill passes SMAW (E7018) on 2” thick carbon steel.
Focuses heavily on static and dynamic load-bearing structural integrity. Best Practices for ASME Audit Readiness
A welder cannot use a qualified WPS until they demonstrate skill. During a WPQ test, the welder deposits a test coupon that is visually inspected and then subjected to bend tests or radiography. The welder receives a that limits them to certain processes, positions, and thickness ranges.
By strictly following the ASME welding standard, manufacturers minimize structural risks, protect human life, and ensure that high-pressure equipment operates safely under the most demanding conditions across the globe.