How to Pick the Right WPS for Your Welder Qualification Test

By Timothy Dodd AWS CWI #00120381 · ICC S2 #8184186

Published: May 15, 2026

Read time: ~11 minutes

The Failure Mode Most People Don't Realize

Most welders and QC managers think a failed qualification means a bad weld. Cracks. Lack of fusion. Failed bend specimens. Visual rejection per D1.1 Clause 4.9.

Those failures happen — but they're not the only way a qualification fails. There's a quieter failure mode that happens before the welder even strikes an arc, and it's just as expensive: the WPS doesn't actually cover the test the welder is about to perform.

When that happens, three things can occur:

• The plate is welded under one set of parameters but qualifies under a different code requirement, and the WPQ that gets issued may not be valid for the project work
• The CWI reviewing the test plate cannot reconcile what was welded against the WPS provided, and the qualification is held in question
• The welder welds a sound plate, the bend specimens pass, the visual passes — and then someone reviewing the paperwork on audit day catches that the WPS didn't match, and the entire qualification gets called into question

Every one of these scenarios is preventable. A ten-minute WPS review before the welder picks up an electrode catches the problem when it's still cheap to fix. This article is that review process.

First, Make Sure You Understand What Each Document Does

WPS, PQR, and WPQ are the three documents that get confused most often. They are related, but they do different things:

The welder qualification test is where the WPS and the WPQ intersect. The welder follows the WPS to weld a test plate. The CWI evaluates the plate to issue the WPQ. If the WPS doesn't cover the test plate configuration, the qualification cannot proceed correctly even if the weld itself is fine. The relationship between these three documents is also covered in the welder qualification vs. certification article.

Prequalified vs. Qualified-by-Testing — Pick Your Path Early

Under AWS D1.1, there are two routes to a valid WPS:

Route 1: Prequalified WPS (AWS D1.1 Clause 5)

A prequalified WPS is one that uses joint designs, base metals, filler metals, and welding parameters that all fall within the prequalified ranges defined in AWS D1.1 Clause 5. Because all variables stay within prequalified limits, the WPS does not require a PQR to support it — AWS has already qualified those parameter ranges through years of testing data.

For most structural steel welding under D1.1, prequalified WPSs are the preferred path. They're cost-effective, well-documented, and widely accepted. The trade-off is constraint: every parameter must stay within Clause 5's prequalified ranges. Drift outside any range, and you're no longer prequalified.

Route 2: WPS Qualified by Testing

If any variable falls outside prequalified ranges — exotic base metal, unusual joint geometry, parameters outside the prequalified envelope — the WPS must be qualified by testing. This means welding a test specimen under the proposed WPS parameters, sending the specimen for mechanical testing (typically bend tests, tensile tests, sometimes Charpy V-notch), and producing a PQR that documents the test results.

A qualified-by-testing WPS is supported by its PQR. The two documents travel together. The PQR essentially says "we welded a sample under these exact parameters and it passed these tests, so this WPS is valid."

The Eight-Point WPS Review

Here is the actual checklist. Walk through each item before the welder welds the test plate. If any item fails — stop and resolve before proceeding.

What if You Don't Have a WPS at All?

This is more common than people admit. A shop gets a project, the spec calls for D1.1 welder qualification, and someone realizes mid-conversation that the company doesn't actually have a written WPS for the work that's coming. Three paths forward:

Path A: Develop a Prequalified WPS Yourself

If your welding falls comfortably within AWS D1.1 Clause 5 prequalified parameters — common base metals, standard joint designs, conventional filler metals — you can develop a prequalified WPS in-house. The process involves:

• Identify the welding process, base metal, filler metal, and position
• Verify all variables fall within Clause 5 prequalified ranges (Table 5.3 for base metals, Table 5.8 for preheat, etc.)
• Document the WPS using a standard form (AWS provides templates) including all required fields per Clause 5
• Have a qualified welding coordinator or engineer review and sign the WPS
• File the WPS in your quality system before welder qualification

This route works for most structural steel shops. It does require someone in-house with code literacy — typically a welding engineer, certified welding educator, or experienced QC manager — and access to the current edition of AWS D1.1.

Path B: Commission WPS Development

Several welding service providers, consulting welding engineers, and code consultants develop WPSs as a paid service. Costs are typically $300 to $1,500 per WPS depending on complexity. For shops that need a one-time WPS for a specific project, commissioning is often cheaper than building in-house code expertise.

WeldCertTest does not develop WPSs as a service. We can refer you to several reputable welding services firms that do. Call (404) 860-1288 if you need a referral.

Path C: Use a Generic Prequalified WPS

Several organizations publish generic prequalified WPSs that can be adopted by any shop, provided the shop's actual welding conditions match the published parameters. These are useful starting points but must be verified to fit your specific welding setup, equipment capabilities, and project requirements. A generic WPS that doesn't actually match your shop's parameters is no better than no WPS at all.

How WeldCertTest Helps With WPS Verification

WeldCertTest does not write WPSs. We do, however, regularly review candidate WPSs that customers send us during the quote phase, to confirm the WPS covers the qualification test they're planning. This review takes about 10-15 minutes per WPS and we don't charge for it.

What we can tell you:

• Whether the WPS covers the test plate configuration the welder will weld
• Whether the listed essential variables fall within prequalified ranges (if it's a prequalified WPS)
• Whether the WPS is missing required fields per current D1.1 edition
• Whether the filler metal references are current (AWS D1.1:2025 removed A5.36 references — see D1.1:2025 changes article)
• Whether the test plate configuration the welder plans to weld matches the WPS

What we cannot do is develop the WPS for you, sign as the welding engineer of record, or approve a WPS that has problems we can identify. Those are separate professional services performed by welding engineers under appropriate authority. But the verification step before testing saves customers significant time and money — most WPS problems are easy to fix if caught before the welder welds.

The Ten-Minute Pre-Test Review

Before the welder strikes an arc for the test plate, walk through this five-step pre-test review with the WPS in hand:

1. Read the project specification — confirm which welding code and edition applies (AWS D1.1, ASME Section IX, API 1104, etc.) and which positions are needed for production
2. Pull the candidate WPS — written document, current revision, signed by qualified welding coordinator or engineer
3. Walk the eight-point checklist — process, base metal, filler metal, position, joint design, preheat/interpass, electrical parameters, shielding gas
4. Verify the test plate matches — base metal certification, thickness, joint preparation (groove angle, root opening, backing if specified)
5. Confirm the welder has read the WPS — and can articulate what process, position, filler metal, and parameters they're going to use

Ten minutes. Done at the welder's facility, before the test plate is welded. Compare against the cost of a failed qualification: a re-weld cycle, re-ship, re-test, plus the project delay from not having the WPQ when expected. The pre-test review is the most cost-effective quality activity in welder qualification.

Frequently Asked Questions

About the Author

This article was written and reviewed by the same CWI who performs all visual inspection for WeldCertTest.

Timothy Dodd

AWS CWI #00120381 • ICC S2 #8184186

AWS Certified Welding Inspector and owner of Xenogenesis, LLC. Reviews candidate WPSs as part of every welder qualification quote at WeldCertTest. Has caught hundreds of WPS-test-mismatch problems before they became failed qualifications.

Roger Baldwin

Site Owner & Operator

Owner and operator of WeldCertTest.com. Coordinates customer WPS verification during the quote process and walks new customers through the eight-point pre-test review.