Does every AWS D1.1 project require a production weld test plate?

No. Production test plates are mandatory under AWS D1.1 for ESW and EGW processes. For SMAW, FCAW, GMAW, GTAW, and SAW, they are only required when the contract documents or owner's specification specifically call for them.

What happens if the production test plate fails?

The welds produced under those conditions must be evaluated. The Code requires investigation of the associated production welds; depending on the findings, repair, additional NDE, or removal of affected welds may be required.

Can the same coupon used for the PQR serve as the production test plate?

No. The PQR is welded before production to qualify the procedure. The production test plate is welded simultaneously with — or immediately before — production joints under the same conditions. They serve different purposes and cannot be combined.

Who is responsible for the production test plate program — the fabricator or the CWI?

The fabricator is responsible for performing the tests; the CWI is responsible for witnessing and documenting. The test program should be defined in the QC plan before fabrication begins so responsibilities and hold-point requirements are clear.

AWS D1.1 Production Weld Tests: When Are They Required?

Production test plates go beyond the PQR — AWS D1.1 mandates them for ESW/EGW, and some owners specify them for any process. What CWIs must document.

What a Production Test Plate Is — and What It Is Not

When most QC managers think about procedure qualification, they think about the PQR: a test coupon welded under controlled conditions before production begins, examined by an independent lab, and kept on file. That's the right model for most situations. But AWS D1.1 also defines a second type of procedure verification — the production control test plate — that operates differently.

A production test plate is welded during fabrication, using the same base metal, filler metal, equipment settings, and technique as the production joint being made at that time. The purpose is not to qualify a procedure from scratch; it's to confirm that the specific combination of parameters actually used in that production run meets the code's mechanical requirements. The distinction matters: a PQR tells you the procedure can work; a production test plate tells you it worked today, with these consumables, on this shift.

When AWS D1.1 Mandates Production Testing

For most common arc welding processes — SMAW, FCAW, GMAW, GTAW, and SAW — AWS D1.1 does not require production test plates as a default. The PQR, combined with welder qualification and in-process inspection, is considered sufficient procedural control.

Electroslag welding (ESW) and electrogas welding (EGW) are the exceptions. Both processes involve extremely high heat inputs, prolonged thermal cycles, and large weld metal deposits that can significantly alter heat-affected zone properties. These conditions make the process inherently more sensitive to parameter variation than conventional arc welding. For ESW and EGW, AWS D1.1 requires production test plates to verify that each set of actual production welding conditions — not just the procedure concept — produces joints meeting minimum mechanical requirements.

The essential variables for ESW and EGW are set out in Table 6.7 of AWS D1.1:2025. A change to any of those variables constitutes a requalification trigger at the PQR level. Production test plates operate as a separate, run-by-run verification layer on top of that qualification.

Rule library based on AWS D1.1:2025; verify against your governing edition.

For all other processes, production testing becomes a requirement only when the contract documents or the owner's supplementary requirements specify it. High-consequence structures — crane runway girders, transfer beams, and moment-frame connections in seismic zones — sometimes carry this requirement. If you're unsure whether your project requires production testing, the answer is in the contract specification, not the Code itself. The prequalified WPS path under Clause 5 of AWS D1.1 provides no exception to a contract-specified production test requirement.

What the Production Test Assembly Looks Like

The production test plate must replicate the production joint as closely as practical: same base metal heat and grade, same filler metal lot, same equipment settings, same position, and the same preheat and interpass temperature regime. For ESW/EGW specifically, the test plate is typically welded immediately before the production joint or alongside it under the same operating conditions. The test plate and the production joint are considered part of the same welding session.

Specimen extraction follows the same pattern as the PQR:

Reduced-section tensile specimens to verify minimum tensile strength
Guided-bend specimens (face, root, or side bends depending on plate thickness) to verify ductility and fusion integrity
CVN impact specimens if the governing specification requires toughness verification

Table 6.8 of AWS D1.1:2025 defines the CVN supplementary essential variables. If any of those variables apply to the project scope, the production test plate must include CVN specimens taken from the same locations as the PQR (weld metal centerline and heat-affected zone at the specified notch distance).

The test plate must be large enough to yield the required number of specimens after sectioning. This geometry needs to be planned before welding starts; production test plates that come up short on specimen length are a common and avoidable documentation failure.

Failure of the Production Test Plate

If a production test plate fails — tensile strength below the base metal minimum, a bend fracture, or CVN results below the specified absorbed energy — the response is not simply to requalify and move on. The production welds made under those conditions are now in question.

The fabricator must investigate why the test plate failed. Was it a measurable parameter deviation from the WPS? A defective consumable lot? An unusual heat condition during that production run? The investigation determines the disposition of the associated production welds. Options typically include:

Additional NDE of the production joints made under those conditions
Mechanical testing of production material (where removal of test coupons is feasible)
Repair and retest

The CWI must ensure this process is documented through the NCR system and that the owner and engineer of record are notified before the associated production joints are released for the next phase of work. See Weld Nonconformance Reports: AWS D1.1 Documentation Requirements for the documentation framework that should cover these dispositions.

CWI Witnessing and Documentation Requirements

For production test plates, the CWI's role is active throughout the test sequence. Key inspection responsibilities include:

Pre-weld: Verify that the test plate base metal matches the production joint grade and heat number; verify consumable lot and certification; confirm that WPS parameters are dialed in before the first arc is struck.

During welding: Record amperage, voltage, travel speed, and wire feed speed at the start of each pass or at regular intervals. For ESW/EGW, record voltage and wire feed speed continuously throughout the run — these are the variables most likely to drift mid-joint. Any deviation from the WPS range must be flagged before the plate is completed.

Post-weld: Witness coupon sectioning and marking. Ensure each specimen is identified with its orientation, test plate ID, and a reference to the associated production joint(s) it represents.

After testing: Obtain the laboratory report and compare results against the acceptance criteria in the WPS and contract specification. Log pass/fail status in the project's weld inspection log.

This documentation becomes part of the audit packet alongside the PQR. If the project uses a records closeout package for owner turnover, the production test plate records should be filed with the same organization as the PQR — the welding records closeout package framework covers how to structure this.

Building the Production Test Program Into Your QC Plan

Surprises with production test plates almost always trace back to inadequate pre-construction planning. By the time the first ESW or EGW run is ready, you should already have answers to:

How many production test plates are required? One per joint? One per welding condition? Per shift?
Who is the testing laboratory, and what is the turnaround time relative to the production schedule?
Does production continue, or is the joint held until test results are received?
If the test plate fails after the production joint is complete, what is the response protocol?

Document these decisions in the fabrication quality plan before the first ESW/EGW scope begins. The fab shop weld quality control plan covers the broader QC plan structure; production test plate provisions belong as a named subsection tied specifically to the ESW/EGW welding scope.

ESW and EGW in Structural Fab Shops

ESW and EGW are less common in typical structural fabrication than SMAW, FCAW, and SAW, but they do appear in heavy-section column splices and thick plate-to-plate T-joints where high deposition rate is a production advantage. Shops that run ESW or EGW occasionally — not as a core process — are the ones most likely to be caught without a production test plate program in place.

If your shop is setting up for an ESW or EGW scope for the first time, review the essential variables in Table 6.7 of AWS D1.1:2025 and plan the production test plate program before the WPS is approved. See ESW/EGW WPS Requirements Under AWS D1.1 for the essential variable breakdown and process-specific qualification considerations.

Managing production test plate records alongside your WPS/PQR library is simpler with a purpose-built system. WPS Welding's qualification record tools integrate production test plate documentation into the same audit-ready package as your procedure qualifications, so the whole picture is in one place when the third-party auditor arrives.