About and methodology
How we build Fillet Gauge, check our material and handle corrections.
Who we are
Fillet Gauge is part of TrueGrade Prep. We make study resources for CWI Part A, CWI Part B, CWI Part C D1.1, CWI Part C D1.5, WPQ2, API 1104 Part C, ICC S1 candidates.
Operating company: Nori Software LLC.
What we build
We build free practice checks, calculators and guides to help you find gaps in your knowledge and plan your study time. Each exam also has a full course: lessons for every task in the published outline, a question bank, timed practice exams and a study plan.
How we write and check questions
Questions are drafted with AI assistance from the exam body's published content outline, then each answer key is re-checked by a separate blind solve and against the code section or source it cites. Questions an expert reviewer has signed say so; every question, signed or not, is corrected as errors are reported.
We write each question from scratch. Each question is mapped to a domain and its published weight, so free check question selection follows the outline's balance. Code references cite section numbers only; we never reproduce code-book text. Use your own licensed copy of any code your exam requires. We never use real or recalled exam items, and reject questions that resemble them.
A question is removed from use if its answer is unreliable, its wording is ambiguous or its reference is out of date. Questions that cannot be corrected are retired, and corrections are recorded in the errata log.
How we check facts
Facts about fees, exam formats and rules link to the exam body's own pages and show the date checked. Those pages are the source to consult before booking or applying. Reported errors go through the corrections process below.
Who checks our questions
Outside experts sign off on question sets. We describe each reviewer by their background and do not publish names unless a reviewer has agreed to it. A reviewer is credited only on the questions they signed.
Our method
- Original questions, written to the exam body's published outline. Never real or recalled exam items.
- Every answer key is confirmed by a separate blind solve.
- Explanations cite the clause, table or figure they rest on, never code-book text.
- Reported errors are corrected within 2 business days and logged in the public errata log.
CWI Part A
- The whole CWI Part A practice bank, course checks and free check. Signed by a CWI with 15 years in structural welding, .
- 80 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 78 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 37 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 13 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 more CWI Part A practice questions. Signed by a CWI with 15 years in structural welding, .
- 124 CWI Part A flashcards. Signed by a CWI with 15 years in structural welding, .
Practice bank: 720 of 720 questions carry an outside-expert sign-off.
Every question in the free 10-question check carries an outside-expert sign-off.
CWI Part B
- The whole CWI Part B practice bank, course checks and free check. Signed by a CWI with 15 years in structural welding, .
- 2 reworded questions in the CWI Part B practice bank. Signed by a CWI with 15 years in structural welding, .
- 59 new CWI Part B practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 more CWI Part B practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 CWI Part B practical practice tasks and 6 free samples. Signed by a CWI with 15 years in structural welding, .
- 39 more CWI Part B practice questions. Signed by a CWI with 15 years in structural welding, .
- 39 more CWI Part B practice questions. Signed by a CWI with 15 years in structural welding, .
- 40 more CWI Part B practice questions. Signed by a CWI with 15 years in structural welding, .
- 120 CWI Part B flashcards. Signed by a CWI with 15 years in structural welding, .
Practice bank: 354 of 354 questions carry an outside-expert sign-off.
Every question in the free 10-question check carries an outside-expert sign-off.
CWI Part C D1.1
- 20 reworded questions in the CWI Part C practice bank. Signed by a CWI with 15 years in structural welding, .
- The CWI Part C free check, course checks and free sample questions. Signed by a CWI with 15 years in structural welding, .
- 60 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
- 34 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
- 6 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
- 38 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
- 36 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
- 121 CWI Part C flashcards. Signed by a CWI with 15 years in structural welding, .
- 15 more CWI Part C practice questions. Signed by a CWI with 15 years in structural welding, .
Practice bank: 380 of 381 questions carry an outside-expert sign-off.
Every question in the free 10-question check carries an outside-expert sign-off.
CWI Part C D1.5
Practice bank: 129 of 129 questions carry an outside-expert sign-off.
WPQ2
Practice bank: 130 of 130 questions carry an outside-expert sign-off.
API 1104 Part C
Practice bank: 129 of 129 questions carry an outside-expert sign-off.
ICC S1
Practice bank: 218 of 218 questions carry an outside-expert sign-off.
Sign-offs are recorded by month. This list shows only what has been signed so far.
Calculators
Our calculators use formulas and published reference data, cited on each tool alongside its assumptions and limits. They support study and preliminary checks; they are not a substitute for the project's engineer or authority having jurisdiction (AHJ).
Independence
Fillet Gauge and TrueGrade Prep are independent and are not affiliated with or endorsed by AWS, ICC or AISC. Exam names are used descriptively to identify the exams our resources cover.
Corrections
Think an answer is wrong? Report it. We correct errors within 2 business days and log every change publicly.
Email hello@filletgauge.com with the page link, exam and question identifier where applicable, and what needs checking.
Errata log: no corrections logged as of 17 October 2026.