Prepare for the American Welding Society Certified Welding Inspector (CWI) exams by linking each study task to the correct exam part. Practise fundamentals, interpreting a supplied measurement and using the approved reference for your chosen codebook exam.
Who can apply for CWI?
The usual eligibility route is a high school diploma or equivalent plus five years of qualifying welding-based work experience. Submit the required education, experience and visual-acuity documentation.
AWS B5.1:2025 also describes other education and experience combinations. Relevant approved education can reduce the work requirement, but credit is limited and does not remove it. Check the table and supporting-document requirements for your own background rather than assuming any degree qualifies.
CWI is the American Welding Society welding inspector credential. Your construction or piping background does not create a different CWI syllabus, and a preparation course does not replace the eligibility requirements.
Sources: Certified Welding Inspector (CWI) | AWS Certification Program — AWS program page: eligibility, exam parts, pricing, renewal, reciprocity, FAQ; Examination User Guide for CWI (September 4, 2026) — AWS CWI Examination User Guide; AWS B5.1:2025 — Specification for the Qualification of Welding Inspectors — Clauses 6–9: experience, examination requirements, structure
What should you expect in Parts A, B and C?
CWI requires at least 72% on each of the three parts. A high result on one part does not compensate for a result below that threshold on another.
Take Part B before Parts A and C. Part B is a practical inspection examination using supplied specimens and documents; you do not produce a live weld. Confirm the selected Part C form and its timing when you book.
| Part | Format and questions | Question time |
|---|---|---|
| A: Fundamentals | Closed-book computer test at Prometric; 165 total, including 150 scored and 15 unscored pretest items | 135 minutes |
| B: Practical | Paper examination at an AWS-authorized site using supplied inspection materials; 46 questions | 120 minutes |
| C: Codebook | Open-book computer test at Prometric; 50–60 scored, with 55–65 total on English forms containing pretest items | 135 minutes with pretest items; 120 without |
Sources: Examination User Guide for CWI (September 4, 2026) — AWS CWI Examination User Guide; CWI Part A Fundamentals Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part B Practical Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part C Codebook Applications Exam Information Guide — AWS Certification Department, Rev. 02.11.2025
What should you practise for each part?
Build a separate task list for fundamentals, practical inspection and code application. Use the current official content guides to check coverage.
The table summarizes the tested areas and suggests study tasks. NDE means nondestructive examination. Review the methods and their limitations using appropriate technical references; the study tasks do not replace the full content guides.
| Part | Areas to review | A useful study task |
|---|---|---|
| A | Terminology; welding and cutting processes; symbols; weld examination; welding application and control; NDE; heat control and metallurgy; calculations; inspector duties; destructive tests; safety | Explain a concept, interpret a symbol or work a calculation, then check the reasoning against an appropriate reference. |
| B | Inspection and discontinuity evaluation; procedure and welder qualification; mechanical tests and properties; NDE; specifications and drawings | Use the supplied practice specification and exhibits to identify the applicable criterion, units, evidence and decision. |
| C | Qualification; fabrication; inspection; reports and records; materials and design | Locate an applicable requirement and its exceptions in the approved reference for your chosen exam, then explain its application. |
Sources: CWI Part A Fundamentals Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part B Practical Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part C Codebook Applications Exam Information Guide — AWS Certification Department, Rev. 02.11.2025
Which study materials and codebook do you need?
Match materials to the exam part: fundamentals references for A, the public sample Book of Specifications for B, and the approved reference and edition for your selected Part C exam.
The Part A guide points to informative references for self-education rather than prescribing one study book. For Part B, practise with the public sample Book of Specifications and read the exam content guide. The exam provides its inspection materials, including exhibits, plastic replicas and an inspection tool kit.
Before buying a Part C reference, check the current Exam References and Editions Guide. For example, its D1.1 entry permits the 2020 or 2025 edition. Do not assume the newest edition of every other code is the one specified for your exam.
Some Part C exams provide an on-screen PDF and prohibit printed codebooks. Where paper is permitted, use an original publication or permanently bound printed copy with securely attached pages and bound errata. Check your selected exam’s rules and practise navigating the reference format it uses.
Sources: Examination User Guide for CWI (September 4, 2026) — AWS CWI Examination User Guide; CWI Part A Fundamentals Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part B Practical Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part C Codebook Applications Exam Information Guide — AWS Certification Department, Rev. 02.11.2025; AWS Exam References and Editions Guide — Last updated August 1, 2025
Practise a boundary-value decision
An inclusive range allows values equal to either endpoint. Compare the supplied measurement with both limits, then limit your conclusion to the criterion you checked.
This original paper exercise uses a fictional worksheet and exact supplied measurements. It is calculation and interpretation practice, not a real code requirement or a complete weld-acceptance decision.
Practice exercise
A training worksheet (fictional, created for this exercise only) states criterion T-7: the measured bead height of a weld specimen must be from 5.5 mm through 6.5 mm, inclusive. Three specimens are measured, and the values are given as exact: specimen A is 5.4 mm, specimen B is 6.0 mm, and specimen C is 6.5 mm. For each specimen, decide whether it meets criterion T-7, and state what else an inspector would need before drawing any broader conclusion about the welds.
Show answer
Specimen A fails T-7 because 5.4 mm is below the 5.5 mm minimum. Specimen B passes because 6.0 mm falls inside the range. Specimen C passes because the criterion says inclusive, so the 6.5 mm upper boundary is allowed.
The lower and upper limits use the same units as the measurements. A is below the permitted range, B is inside it and C equals the included upper limit. Record the value, criterion and result so the comparison can be checked. Meeting this one invented criterion does not establish compliance with other requirements; a broader acceptance decision needs the actual applicable criteria and evidence. T-7 is not an AWS Book of Specifications or governing-code rule.
Sources: CWI Part B Practical Exam Information Guide — AWS Certification Department, Rev. 03.01.2024
How can you turn practice errors into a study plan?
Record the specific reason for each missed or guessed answer, then choose a short follow-up task that addresses it.
- Concept gap: revisit the relevant Part A topic and explain it in your own words.
- Reference gap: practise finding the applicable provision and exceptions in the correct Part B or C document.
- Calculation or interpretation gap: write the units, limits and comparison before deciding whether a supplied value meets the stated criterion.
- Timing gap: repeat a short set under timed conditions after you understand the answers.
- Coverage gap: compare your error log with all three content guides; repeated practice in one familiar area does not cover the other parts.
Sources: CWI Part A Fundamentals Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part B Practical Exam Information Guide — AWS Certification Department, Rev. 03.01.2024; CWI Part C Codebook Applications Exam Information Guide — AWS Certification Department, Rev. 02.11.2025
What should you check before applying?
Candidates in the US and Canada apply through AWS; candidates outside that area use an AWS Agent. Confirm the current application route, total price and required documents for your location.
Use the confirmation letter and eligibility codes to arrange the computer-based parts, and keep the required order of taking Part B first. Check appointment instructions for identification, arrival, permitted equipment and rescheduling.
CWI renewal falls at years three and six, followed by nine-year recertification. Review the current requirements and available recertification routes as your deadline approaches.
Sources: Certified Welding Inspector (CWI) | AWS Certification Program — AWS program page: eligibility, exam parts, pricing, renewal, reciprocity, FAQ; Examination User Guide for CWI (September 4, 2026) — AWS CWI Examination User Guide
Sources
Facts checked:
- Certified Welding Inspector (CWI) | AWS Certification Program
- Examination User Guide for CWI (September 4, 2026)
- CWI Part A Fundamentals Exam Information Guide
- CWI Part B Practical Exam Information Guide
- CWI Part C Codebook Applications Exam Information Guide
- AWS B5.1:2025 — Specification for the Qualification of Welding Inspectors
- AWS Exam References and Editions Guide