How hard is the CWI exam? What each part asks of you

If you would rather see where you stand than read about it, start with the free 10-question check for your part. Links are at the bottom of this page.

How hard is the CWI exam in numbers?

AWS publishes no pass rate for the CWI exam, so there is no honest percentage to quote. The CWI pass rate guide covers what AWS does publish and why the figures on training sites can't be checked. What you can measure is the shape of the exam:

Pretest questions look exactly like scored ones, so treat every question as if it counts.

Part A: hard because nothing is in front of you

Part A is 165 questions in 135 minutes, which is about 49 seconds a question. There is no code book and no notes. The material is wide: processes, definitions, symbols, NDE, metallurgy, calculations, destructive testing and an inspector's duties. A slow reader who knows the material can still run short on time, and a fast reader who has gaps cannot look anything up.

What makes it hard

• Breadth. Ten domains, and AWS publishes only minimum weights, so any topic can show up.
• Exact vocabulary. Many questions turn on what a term means, not on a general idea of it.
• The clock. Under a minute a question leaves no room to work a calculation slowly.

How to prepare

• Make recall the whole method. Read a topic, close the page and write the answer from memory.
• Learn the formulas cold, since you can't look them up. Work heat input and carbon equivalent by hand until it is routine.
• Practice at pace. A set of 20 questions in under 16 minutes feels very different from the same set with no timer.
• Use the Part A guide to see where the points sit, then take the free Part A check to find your weak domains.

Part B: hard because it is hands-on and timed

Part B is 46 questions in 120 minutes, about 2.6 minutes each. You work at a table with plastic weld replicas, an inspection tool kit, a booklet of documents and photos, and the Book of Specifications. Every answer comes from measuring something or checking a document against that book, not from memory of D1.1. You also take it first, so you meet this part before you have any exam experience.

What makes it hard

• Measuring is a skill. Reading a fillet gauge or a V-WAC style gauge correctly, and knowing which dimension it reports, takes practice with the real tools.
• The reference book is only useful if you know its layout. Searching it page by page burns minutes you don't have.
• Qualification documents have to be checked against a weld you can see, which means judging whether a WPS, PQR or welder record covers it.

How to prepare

• Practice with gauges and replicas, not only with notes. The weld gauge reading trainer and the Part B measurement workflow are a start.
• Get the Book of Specifications, which is a free PDF from AWS, and time every lookup until finding a table takes seconds.
• Read the Part B guide for the tool kit and a timed plan, then take the free Part B check.

Part C: hard because the code is on a screen

Part C is open book, but open book is not the same as easy. For D1.1 it is 55 questions in 135 minutes, about two to two and a half minutes each, with the code as a PDF at the test center and word search switched off. You reach a clause by its number and bookmarks, so a candidate who has not mapped the code spends the clock scrolling.

What makes it hard

• Speed of navigation. Knowing the answer exists in Clause 5, 6, 7 or 8 is not enough. You have to land on it and read the condition correctly.
• Edition. You study the edition your exam uses, and a retest keeps the same code, so choosing wrong costs you across attempts.
• Reading carefully. The right clause with the wrong table or condition gives the wrong answer.

How to prepare

• Use your own licensed copy of the code and learn its layout until you can say which clause covers design, prequalification, qualification, fabrication and inspection.
• Time yourself on lookups. The code navigation drill and the Part C D1.1 guide are built for this.
• Stop trying to memorize code text. It is open book, so train your route to the answer.
• Take the free Part C (D1.1) check and note how long each question takes you, not only your score.

What the 72% rule does to the difficulty

Each part needs at least 72%, and the composite, the simple average of your three part scores, also needs to be at least 72%. Scores are reported rounded down to the whole percent, so 71.9% shows as 71%.

The part-by-part rule is what makes the exam feel harder than any single section. A strong Part A can't rescue a weak Part B. Take scores of 84% on A, 70% on B and 79% on C. The composite is 77.7%, but Part B is under the line, so Part B gets retaken. On Part B with 46 questions and no pretest items, 33 correct is 71.7%, reported as 71%, and 34 correct is reported as 73%. You can miss at most 12.

Measure your practice against 72% on each part, not against one blended number.

What happens if you miss a part

You retake only the part you failed when your composite is at least 72%, and the parts you passed stay passed. You get three retests within three years of your original test date. The first needs no extra training evidence, but a second or third retest needs documented instruction before you apply. Each retest is another fee. The retest rules guide has the detail, and failed a CWI part? rebuild your study plan shows how to fix the gap that cost you the first attempt.

So, is the CWI test hard?

Yes, if you prepare for all three parts the same way. Part A rewards recall, Part B rewards hands-on practice and a book you know well, and Part C rewards a fast route through the code. Match your study to each one. The CWI study guide puts all three parts in a study order with a tool or drill for each topic.

Find out how hard it is for you

The free 10-question check is scored by domain, takes no signup and shows which topics to study first. Take the Part A check, the Part B check or the Part C (D1.1) check. When you're ready for the full prep, the Fillet Gauge course gives you a lesson for every exam subject, two full-length timed practice exams per part and a worked explanation with every answer, so you can see your score per part before AWS does.

FAQ

Which CWI part is the hardest?

It depends on you. Part A is hardest if recall is your weak side, Part B if you have little hands-on time with gauges, and Part C if you haven't practiced finding clauses fast. The free check for each part shows which one needs the most work.

Is the CWI exam open book?

Parts B and C are open book, with the Book of Specifications for B and your code for C. Part A is closed book.

What if I fail one part?

You retake only that part, as long as your composite is at least 72%. The parts you passed stay passed, and you have three retests within three years of your original test date.