1.2 Exam Structure, Routes & Scoring

How the IWI-S Examination Is Organised

IWI-S is not a single 100-question sitting with one combined score. Under the IAB-041 IWIP model, assessment is multi-part, matching the dual syllabus of Welding Technology and Welding Inspection, plus standards application and practical competence.

Written examination parts (education route labels)

Depending on your access route, you may sit the full set of Basic + Standard papers or a reduced set if the ANB/ATB grants credit for prior IIW education (for example, candidates already holding relevant coordination or Basic inspector progress). Always obtain a written route decision from the ATB — informal "I already know this" does not waive an examination part.

Written papers are typically multiple-choice theory assessments covering processes, metallurgy, design/symbols, imperfections, NDE overview and quality documentation. The Application of Standards paper specifically tests whether you can use acceptance and quality standards — not merely name them.

Practical and oral assessment

PE-S (Practical Exam — Standard) and oral/practical assessment elements verify that you can perform inspector tasks with real (or realistic) welds, documents and measurement tools. Expect activities in the spirit of:

• Visual examination of welded joints and reporting imperfections with correct ISO 6520 terms
• Checking dimensions, preparation and weld size against drawings/WPS
• Reviewing a WPS/WPQR package or welder qualification for completeness and range of approval
• Demonstrating knowledge of NDE method selection and, where required at Standard, radiographic film quality checks
• Explaining accept/reject reasoning against a stated standard (often ISO 5817 quality level B, C or D)

Oral questioning probes whether your written knowledge transfers to job-site judgement: "Would you stop the job?", "What hold point is missing?", "Which NDT method next and why?"

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Scoring: 60% Written Papers, 70% Application of Standards

The pass rules are set by the IIW/IAB examination framework — the IAB-041r6-24 education guideline and the IAB-360r1-25 certification scheme. The minimum marks are:

Why Application of Standards is harder

A 70% bar on Application of Standards is intentional. Naming ISO 5817 is easy; deciding whether a measured undercut, excess weld metal or misalignment is acceptable at quality level C on a structural fillet is harder. The paper rewards candidates who:

1. Read the stated quality level and product standard on the scenario
2. Know which imperfections are not permitted at any ISO 5817 level (notably cracks, lack of fusion, lack of penetration — subject to the standard's rules)
3. Apply dimensional limits for shape imperfections correctly rather than inventing shop folklore
4. Link the decision to the ITP, drawing and WPS, not only to "what the welder usually does"

Exam trap: Scoring ≥60% on technology papers while failing Application of Standards at 65% still fails the diploma route. Budget study time for using standards, not only for process physics.

Exact mark schemes, paper lengths and whether certain modules are combined into one sitting are set by the IAB-approved examination body in your country. Treat the 60% written / 70% Application of Standards framework as the global intent, and confirm local exam notices with your ATB.

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Completion Window: Up to Three Years

Candidates generally have up to three years from the first examination to complete all required parts. That window exists because the route is modular: you may pass technology papers in one diet and inspection/practical later, or re-sit a failed part without restarting the entire diploma from zero.

Implications for planning:

• Do not sit the first paper "just to try" unless you have a plan to finish within three years — a partial pass that expires is wasted money and momentum
• Re-sits of failed parts follow ATB/IAB rules (fees, waiting periods, maximum attempts) — ask before you fail casually
• Course completion and examination completion are related but not identical: finishing lectures does not freeze the three-year clock if you never book exams

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Standard Route vs Alternative Access Routes

IAB-041 defines access conditions so that Standard-level candidates arrive with enough technical foundation.

Standard (full education) route

Typical path:

1. Meet entry requirements (technical/engineering education and/or industrial experience as defined for the route)
2. Complete WT and WI modules for Basic and Standard as required
3. Sit WTE-B/S, WIE-B/S, Application of Standards, PE-S and oral elements as required
4. Receive the IWI-S diploma when all parts are passed within the time window

Alternative routes

Alternative routes may grant module or examination credit when you already hold relevant IIW education or documented experience. Common real-world patterns (always verified by the ANB/ATB, not assumed):

• Progression from IWI-B into Standard modules only
• Access conditions linked to welding coordination education (for example conditions comparable to IWS-level routes) plus industrial experience
• Experienced inspectors with substantial fabrication backgrounds who still complete inspection modules and examinations but may not redo every technology hour

Industrial experience is not a free pass. Experience supports access and makes practical exams easier; it does not replace proving Application of Standards at 70% or knowing ISO 2553 symbols and ISO 6520 classification.

Who decides your route?

If two ATBs give conflicting verbal advice, demand the written access-route determination under the ANB rules in force.

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No Fixed Global MCQ Total — What That Means for Prep

IIW/IAB does not publish one fixed worldwide total number of multiple-choice questions for IWI-S. Paper length can vary by examination body and diet. OpenExamPrep exam-meta therefore records official examQuestions as not-published and supplies a separate free practice bank of 100 selected-response items covering written theory domains:

• Welding processes & parameters (~18%)
• Metallurgy & HAZ behaviour (~17%)
• Design & welding symbols (~17%)
• Weld defects, causes & prevention (~18%)
• NDE method overview VT/PT/MT/RT/UT (~15%)
• Codes, standards, acceptance & QA documentation (~15%)

Use the 100-question bank to measure domain mastery, not to reverse-engineer an official item count that does not exist. Never claim "the IWI-S exam is 100 questions" on a résumé or in client documents — that number is the OpenExamPrep practice set, not the IAB global total.

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Fees, Delivery and Remote Testing

• Cost varies by country and ATB; course fees and exam fees are often charged separately
• Delivery is commonly ATB classroom, workshop practical and invigilated written exams — OpenExamPrep records remote testing for the official IWI-S diploma exams as not generally available in the same way as some commercial online proctored tests
• Scheduling is through your ATB / IAB-approved examination body, not through a single global booking portal for every country

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Study Implications of the Multi-Part Structure

Because the diploma fails if any required part fails within the rules:

1. Build two knowledge tracks in parallel early — technology (processes, metallurgy) and inspection (imperfections, NDE, codes)
2. Schedule Application of Standards drills weekly, not only in the last three days
3. Treat practical/oral as a separate skill: talk through accept/reject decisions out loud with a peer or AI tutor
4. Track which official papers you have passed and the three-year deadline from your first sitting
5. After each practice-question miss, write the standard number and the decision rule, not just the correct option letter

That exam architecture is why later chapters of this guide separate Welding Technology topics from Welding Inspection topics, then reunite them in codes, ITPs and exam strategy.