CWI Pass Rate: Part A vs Part B vs Part C Breakdown (2026)
Most CWI pass-rate articles quote one blended number around 65–70% — hiding where candidates actually fail. The AWS Certified Welding Inspector exam has three distinct parts — Part A (fundamentals), Part B (hands-on practical), Part C (open code book) — with dramatically different pass rates. This breakdown splits the estimates by part, explains why Part B is the bottleneck, quantifies the seminar uplift, and gives a retake strategy for every failure pattern.
CWI Pass Rate by Part: The Numbers That Matter
| Part | First-Time Pass | Overall (incl. retakes) | Most Common Failure Cause |
|---|---|---|---|
| Part A — Fundamentals | ~70% | ~85% | Welding metallurgy, NDT method limits, safety exposure limits |
| Part B — Practical | ~50–55% | ~75% | Time pressure, wrong gauge selection, sloppy written reports |
| Part C — Code Book | ~60–65% | ~80% | Untabbed code book, unfamiliar code choice |
| All three combined | ~30–40% | ~65–70% | Failing any single part fails the attempt |
Caveat: AWS does not publish official pass rates. These are industry estimates triangulated from Accredited Testing Facility reporting, training-provider cohort data, and candidate surveys — treat them as planning benchmarks.
Why AWS Doesn't Publish Official Numbers
Exam content is partially randomized between windows, Part C difficulty depends on the code selected, and AWS avoids pass-rate marketing wars between providers. The estimates here triangulate ATF proctoring data, provider cohort results, and thousands of candidate post-mortems.
Part A Deep Dive: Fundamentals (~70% First-Time)
Part A is 150 closed-book multiple-choice questions in 2 hours with a 72% bar — the most predictable part. The topics that fail candidates: welding metallurgy (HAZ behavior, carbon equivalent, preheat), NDT method limits (UT volumetric vs MT surface), safety and health exposure limits, AWS A2.4 weld symbols, and destructive-testing distinctions. The fix: 500+ practice questions plus full reads of AWS B5.1 and the CWI Body of Knowledge.
Part B Deep Dive: The Practical Bottleneck (~50–55%)
Part B is where the CWI stops being a knowledge test. Candidates work through six hands-on scenarios — visual inspection of plastic weld replicas, fillet weld measurement, groove weld evaluation, macroetch examination, welder qualification paperwork, and combined measurement-plus-report tasks — each on roughly a 1.5-hour clock against a hypothetical Book of Specifications (BOS). The four killers: time pressure, choosing the wrong gauge for the joint geometry, applying real-code limits instead of reading the BOS, and incomplete written accept/reject reports — a correct finding with a sloppy report still fails. Never having handled the replicas before exam day is the strongest argument for structured hands-on prep.
Part C Deep Dive: Code Choice Decides Your Odds (~60–65%)
| Code | Difficulty | Estimated Part C Pass |
|---|---|---|
| AWS D1.1 (Structural Steel) | Easiest | ~62–68% |
| AWS D1.5 (Bridge) | Moderate | ~58–63% |
| ASME Section IX | Moderate | ~58–62% |
| API 1104 (Pipeline) | Moderate-hard | ~55–60% |
| ASME B31.1 (Power Piping) | Moderate-hard | ~55–60% |
| ASME B31.3 (Process Piping) | Hardest | ~48–55% |
Part C is open-book, which lulls candidates into under-preparing. Failure modes: an untabbed code book, choosing a code you don't use daily, skim-reading questions that hinge on one mid-paragraph clause, and bringing the wrong code edition. D1.1 candidates consistently pass at higher rates than B31.3 candidates.
Seminar Attendance: A ~20-Point Uplift
The biggest controllable variable is structured preparation. Cold self-study candidates pass all three parts at roughly 25–30% first-time; official AWS seminar attendees average 45–55%; experienced inspectors combining the seminar with 5+ years of field work reach 65–75%. The lift comes from hands-on replica practice, code-specific drilling, and timed pacing. Atlantis NDT's CWI coaching, led by ASNT Level III instructors, applies the same levers — replica drills, code-tabbing workshops, timed mocks.
Pass Rate by Industry and Code Exposure
Daily code exposure predicts outcomes: structural fabricators testing on D1.1 pass first-time at roughly 40–45%, bridge fabricators (D1.5) around 38–42%, pipeline candidates (API 1104) 30–35%, power piping (B31.1) 32–38%, and process-piping candidates (B31.3) just 25–32% — the hardest path. Choose the code you work with, not the one your employer's spec happens to name.
Retake Strategy by Failure Pattern
AWS gives a one-year window to retake only the failed parts. Match the fix to the failure: Part A → drill metallurgy and safety with question banks; Part B → pure hands-on gauge-and-replica practice under strict timing; Part C → re-tab the book and consider switching to D1.1; all three → step back, get supervised field experience, and rebuild. Most candidates who retake within 60–90 days pass. Planning your budget too? See the CWI exam cost and investment guide, benchmark outcomes in the NDT salary guide, and explore ASNT certification as the natural companion credential.
Frequently Asked Questions
What is the AWS CWI pass rate?
Industry estimates: Part A ~70% first-time, Part B ~50–55%, Part C ~60–65%, and roughly 30–40% for all three parts on the first attempt. AWS publishes no official figures; these are triangulated from testing facilities, training providers, and candidate surveys.
Which CWI part has the lowest pass rate?
Part B, the hands-on practical, at roughly 50–55% first-time. Six timed scenarios with weld replicas, gauges, and written reports punish candidates who prepared only from books.
Does the AWS seminar really increase pass rates?
Yes — by an estimated 15–25 percentage points, through hands-on replica practice, code-specific drilling, and timed pacing. For career-changers without daily code exposure, structured prep is effectively mandatory.
Which code should I choose for Part C?
The one you use daily. Otherwise D1.1 is statistically safest — the most-taught code with the highest Part C pass rates — while B31.3 is hardest for first-timers.
What happens if I fail one part?
You have one year from the original exam date to retake only the failed part(s); after a year, all three must be retaken. Retake within 60–90 days while the material is fresh, targeting only your failure pattern.
How long should I study for the CWI exam?
Experienced weld inspectors: roughly 80–120 hours. Transitioning NDT technicians: 150–200 hours with heavy metallurgy focus. Career-changers: 250–350 hours plus hands-on practical preparation.
Atlantis NDT Products & Services
Passing the exam is step one; managing inspection work is the career. Atlantis NDT supports inspection teams end-to-end with NDT inspection management software — Atlantis ERP, our digital twin platform for asset integrity, and purpose-built NDT reporting software. Our NDT training & certification programs are authored by an ASNT NDT Level III, while ASNT Level III consulting and 3D laser scanning services cover the full inspection lifecycle. Everything is affordable, accessible, and fully customizable — book a free consultation for a tailored quote.