Changes that affect the mechanical properties (like tensile strength or toughness) of the weldment. A change in an essential variable (e.g., changing from a carbon steel filler metal to a stainless steel filler metal) requires a new PQR and an updated WPS.
Contains stringent welding and non-destructive examination (NDE) requirements tailored for the nuclear sector. 2. Core Pillars of ASME Section IX
The PQR is the "test record" that supports the WPS. It is not a standalone instruction document; rather, it is a historical record of a test weld that was made and tested under a specific set of conditions. The PQR documents the actual welding parameters used to create a qualification test coupon and, most importantly, the results of the mechanical tests (tensile, bend, and impact when required) performed on that coupon. These test results are the objective evidence that the welding procedure is capable of producing welds with acceptable mechanical properties. The PQR serves as the foundation upon which the allowable ranges for essential variables on the WPS are built. welding standard asme
Establishes the foundational rules applicable to all joining processes, including definitions, organizational responsibilities, and the concept of operational control.
Changes that do not significantly affect the mechanical properties of the weld (e.g., changing the groove design or nozzle size). These can be edited directly on the WPS without rewriting the PQR. 4. How Section IX Interacts with Construction Codes Changes that affect the mechanical properties (like tensile
Rules for the construction of pressure vessels, including specific weld joint requirements [21]. Compliance and Verification Authorized Inspectors (AIs) : ASME compliance often requires third-party oversight. Authorized Inspectors
A WPS is a written document that provides direction to the welder. It includes parameters such as: The PQR documents the actual welding parameters used
The is not a single document but a sophisticated system anchored by ASME Section IX and supported by construction codes like Section VIII and B31.3. Mastering this standard requires understanding the difference between essential and non-essential variables, P-Numbers, welder continuity, and NDE acceptance criteria.
The WPS is developed based on the results of a successful Procedure Qualification Record (PQR). All essential and nonessential variables must be clearly defined on the WPS, including, but not limited to: