CAWI Exam Domains 2026: Complete Guide to All 3 Content Areas

Exam Structure Overview: Three Parts, Three Scores

The Certified Associate Welding Inspector exam administered by the American Welding Society (AWS) isn't a single test - it's three distinct parts, each built to measure a different kind of competency, and each scored on its own. Part A checks written knowledge of welding fundamentals. Part B is a hands-on, tool-in-hand practical exam. Part C is open-book code application using AWS D1.1 structural steel as the CAWI's code line. Together they total 266 questions and 390 minutes of active testing time, but they aren't taken back to back in one appointment - Part B is administered on paper at AWS-authorized sites, while Parts A and C are delivered by computer through Prometric.

This three-part design is why generic exam prep doesn't work well for CAWI. Studying "welding inspection" as one undifferentiated topic ignores the fact that Part A rewards memorized terminology and process knowledge, Part B rewards physical measurement skill with real tools and specifications, and Part C rewards the ability to navigate a codebook quickly under time pressure. For a full breakdown of how the parts fit together with the registration process, see the CAWI Study Guide 2026: How to Pass on Your First Attempt.

Domain 1: Part A Fundamentals

Part A is the closed-book knowledge exam. It has 165 total questions - 150 scored plus 15 unscored pretest items mixed in without being identified - delivered in 135 minutes. Because it's closed-book, this is the one part where memorization genuinely matters; there's no codebook or reference sheet to fall back on mid-exam.

The published minimum subject allocations for Part A are:

Notice that Definition and Terminology and Welding Processes together carry the largest published minimums, meaning a candidate who can precisely define weld joint terms, discuss arc welding processes, and read welding symbols accurately is covering the heaviest-weighted ground first. Test Methods - NDE and Weld Examination also deserve real attention since together they approach a fifth of the part's minimum allocation.

One detail worth flagging for 2026 candidates: AWS B5.1:2025 updates terminology and folds Part A's welding and cutting content together under a new "Joining and Cutting Processes" heading with a recommended minimum of 14%. If your prep materials reference this newer terminology, don't assume it replaces the numbers above - treat it as an evolving label to watch, not a confirmed final weighting, and always check current AWS guidance before your appointment.

Domain 2: Part B Practical

Part B is the practical exam: 46 questions in 120 minutes, administered on paper at AWS-authorized sites rather than through Prometric. This is the part where candidates work directly with supplied specifications, weld replicas, and inspection tools - measuring fillet welds, checking for undercut or porosity, and applying acceptance criteria to physical samples rather than answering abstract multiple-choice prompts about theory.

The concentration here is dramatic compared to Part A: Welding Inspection and Flaws alone carries a 34% minimum, and combined with Procedure and Welder Qualifications, more than 60% of Part B's minimum weighting sits in just two subject areas. That tells you exactly where hands-on practice time should go - measuring and identifying visible weld discontinuities, and reviewing welding procedure specifications (WPS) and welder qualification records for completeness and correctness.

Because tools and replicas are supplied at the test site rather than brought by the candidate, familiarity with standard inspection tools - fillet gauges, weld size gauges, calipers - matters more than owning a personal kit. If you've never physically measured a fillet weld against a gauge under time pressure, Part B is not the place to find out how that feels for the first time. Practicing with real hardware, not just photos in a study guide, is the difference-maker here.

Domain 3: Part C Code Book

Part C is the open-book code application section, built on AWS D1.1 structural steel, with 55 questions - 50 scored plus 5 pretest - in 135 minutes. This is not a memory test; it's a navigation and application test. Candidates are expected to locate the correct clause, table, or figure in D1.1 quickly and apply it correctly to a scenario, which means the exam is really testing how well you know the codebook's structure, not whether you've memorized its contents word for word.

Qualification, Fabrication, and Inspection are weighted evenly at 25% each - together forming the overwhelming majority of the part - while Reports and Records and Materials and Design sit at a modest 5% each. That even three-way split means you can't specialize in one D1.1 chapter and skip the others; you need working fluency across qualification procedures, fabrication requirements, and inspection criteria simultaneously.

A critical logistics point for 2026: the site's preparation content targets D1.1:2025, the current edition listed on AWS's D1.1 program page, but the linked Exam References and Editions Guide also still permits D1.1:2020, with both editions available digitally. Digital word search is disabled in the exam-day digital reference, and printed bound references are also permitted. Whichever format you use, match your codebook edition exactly to what your specific appointment's reference instructions require - using the wrong edition, or relying on a search function that won't work on exam day, can cost you time you don't have in a 135-minute window.

Scoring Requirements by Part

CAWI's passing standard is stricter than it first appears: candidates must score at least 60% on each part individually. There is no averaged overall score that lets a strong Part A performance offset a weak Part B. Fail one part below 60%, and you haven't passed CAWI overall, regardless of how well you did elsewhere.

This part-by-part threshold is the single biggest reason candidates should study Part A, Part B, and Part C as three separate exams rather than one combined body of knowledge. For a deeper walkthrough of exactly what the 60% threshold means for retake strategy and part-specific weak spots, see CAWI Passing Score 2026: Exactly What You Need to Pass.

Side-by-Side Comparison of the Three Parts

Sequencing Your Prep Around the Domains

Given that Part B must be scheduled before Parts A and C, it makes sense to build your study plan in that order too, rather than defaulting to a generic "study everything evenly" approach. A practical sequence looks like this:

This is really the only place generic study methodology belongs in CAWI prep - the sequencing itself is dictated by the exam's own scheduling logistics, not by an arbitrary calendar template. For a more detailed week-by-week breakdown with drills for each part, check the CAWI Study Guide 2026: How to Pass on Your First Attempt, and use timed practice questions on the main practice test site to simulate each part's time pressure before you sit for the real thing.

Who Hires for CAWI-Level Inspection Work, and What Comes Next

CAWI credential holders work under the supervision of a Certified Welding Inspector (CWI) or Senior Certified Welding Inspector (SCWI) - the credential is explicitly an associate-level entry point, not an independent inspection authority. It's valid for no more than three years and cannot be renewed or recertified; moving forward means meeting CWI experience and examination requirements on their own merits, not simply waiting out the CAWI clock.

Eligibility to sit for CAWI in the first place runs through several documented paths based on education and experience - high school plus two years of qualifying experience, eighth grade plus four years, less than eighth grade plus six years, eighth grade plus one year of vocational welding training plus three years, or two years of qualifying postsecondary study plus six months. Education, employment history, and a recent vision examination all need documentation; initial preparation training itself isn't mandatory. Full details on documentation and which path fits your background are covered in CAWI Requirements 2026: Eligibility, Prerequisites & How to Qualify.

For candidates weighing whether the time and cost investment fits their career plans, it's worth reading about the fee mechanics and long-term positioning separately - see CAWI Certification Cost 2026: Complete Pricing Breakdown and Is the CAWI Certification Worth It? Complete ROI Analysis 2026 for context beyond the domain content covered here.

Frequently Asked Questions