WPS and PQR Development

A useful welding procedure begins with the product application. Joint design, base materials, service conditions and required properties determine the controls and testing needed. HCR reviews the drawings, customer specifications and applicable construction and qualification standards before proposing a test program. ASME Section IX qualifies procedures and personnel; the construction code and project specifications establish additional requirements for the product.

Under ASME Section IX, essential variables govern changes that require requalification. Nonessential variables must be addressed on the WPS but can be revised without a new procedure qualification. Supplementary essential variables apply when notch toughness is required. Their applicability must be assessed for the specific process and qualification; these ASME categories should not be presented as identical rules under AWS, API or ISO standards.

A qualification coupon must provide the coverage needed for the intended work. Filler metals, joint configuration, process sequence, preheat, interpass controls and any post weld heat treatment are selected together. The PQR records actual qualification conditions and test results. The WPS defines the permitted production instructions supported by that evidence. A complete package connects the production requirements to a defensible qualification record.

Tensile testing evaluates the strength of a test specimen containing the welded joint. Guided bend testing evaluates ductility and reveals unacceptable discontinuities under the applicable acceptance criteria. Neither test alone proves every aspect of service performance.

Macro examination reveals weld geometry, fusion and penetration at the section examined. Charpy impact testing measures absorbed energy at a specified temperature when notch toughness is required. Hardness surveys assess local hardness in specified regions, such as the weld metal, heat affected zone and base metal, when the code or customer requires them.

The test program depends on the qualification type, governing standard and service requirements. Hardness, macro, impact and NDE examinations are not universal requirements for every ASME Section IX groove weld PQR. HCR identifies the required tests before coupon welding so the records answer the actual qualification question.

Procedure development can address GTAW (TIG), GMAW (MIG), FCAW, SMAW and SAW, including combinations selected for root, fill and cap passes. Process selection considers access, productivity, weld quality, consumable availability and the required properties after any heat treatment.

Material coverage is established from the actual specification and supporting records. ASME P-Numbers group base metals for qualification purposes; Group Numbers may also matter when notch toughness is required. F-Numbers group filler metals by usability characteristics and affect qualification requirements. These classifications do not establish alloy equivalence or guarantee matching strength or corrosion performance.

HCR reviews the intended materials and processes project by project. Specific qualification coverage is stated only after the relevant PQRs and production requirements have been checked.

Send HCR the WPS, supporting PQRs, test reports, drawings and project specifications for a remote welding procedure review. We compare the package with the intended production welds and identify unsupported ranges, missing information, inconsistent variables or testing gaps.

The review covers material and consumable selection, process sequence, qualified thicknesses, applicable position restrictions, thermal controls and required test results. Findings distinguish corrections that can be made to the WPS from conditions that may require additional qualification.

The deliverable is a technical findings summary with recommended actions. Document review can often begin without travel or new testing, although the findings may identify a need for either before the procedure is accepted for production.