WPS/PQR Requirements Practice Questions

Explanation: Toughness requirements usually specify notches in the Weld Metal Centerline AND the HAZ (and sometimes Fusion Line + 1mm, etc.) to ensure all zones meet the criteria.

Explanation: Current type and polarity are essential variables. Changing AC to DC changes penetration and heat input significantly.

Explanation: ESW (and EGW) are NEVER prequalified processes in AWS D1.1. They always require qualification testing.

Explanation: The WPS is the written instruction set — the 'recipe' — that directs the welder in producing a weld that meets the code. The PQR records results; welder qualification is a separate document.

Explanation: A PQR records the actual values used to make the qualification test weld and the mechanical-test results, providing the evidence that the WPS will produce sound welds.

Explanation: A single PQR can support one or more WPSs, as long as each WPS stays within the essential-variable ranges qualified by that PQR.

Explanation: Nonessential variables do not affect the tested mechanical properties, so the WPS can simply be revised. Only essential-variable changes force requalification (a new PQR).

Explanation: By definition, an essential variable affects weld mechanical properties, so exceeding its qualified range requires requalifying the procedure with a new PQR.

Explanation: AWS D1.1 allows certain conforming joints, processes, and materials to be used without qualification testing. Such a prequalified WPS still must conform to all of the code's prequalification rules.

Explanation: GMAW-S (short-circuiting transfer) is specifically excluded from prequalification in AWS D1.1 because of fusion concerns, so it always requires qualification testing. Electroslag and electrogas are likewise excluded.

Explanation: A groove-weld PQR on plate typically requires reduced-section tension tests (for strength) and guided-bend tests (for soundness and ductility). Additional tests such as CVN are added only when required.

Explanation: For procedure qualification the mechanical properties of the coupon do not depend on position, so a WPS qualified in one position may be used in all positions. Position IS essential for WELDER qualification — a classic exam contrast.

Explanation: CVN testing is a supplementary requirement performed when notch toughness is specified by the contract or code. It is not part of every procedure qualification.

Explanation: Lowering the preheat below the qualified minimum raises cooling rate and can harm properties/promote cracking, so it is an essential-variable change that requires requalification.

Explanation: Base metals of similar weldability are grouped so that qualification on one member of the group can cover others. ASME Section IX uses P-numbers; AWS D1.1 uses its own grouping tables.

Explanation: Filler metals/electrodes are grouped by F-number based on usability characteristics. (A-numbers describe weld-metal chemistry; P-numbers group base metals.)

Explanation: The organization performing the welding — the manufacturer or contractor — is responsible for the WPS and PQR and certifies them. The CWI verifies compliance but does not own the documents.

Explanation: A WPS must address the welding variables needed to reproduce the weld: process, base and filler metals, joint design, positions, preheat/interpass, and electrical characteristics, among others.

Explanation: Because nonessential variables do not affect the qualified mechanical properties, the original PQR remains valid and continues to support the revised WPS.