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Key Facts: IIW IWI-S Exam

100

Practice Questions

OpenExamPrep

B/C/D

ISO 5817 Quality Levels

ISO 5817

70%

Application of Standards Pass

IIW IAB-041

50%

Minimum per Written Part

IIW IAB-041

Intermediate

Standard Inspector Tier

IIW

3 years

Window to Complete Exams

IIW IAB-041

The IIW International Welding Inspector — Standard (IWI-S) is the intermediate inspector tier of the International Institute of Welding's IAB-041 scheme, between IWI-Basic and IWI-Comprehensive. Candidates train at an IIW Authorised Training Body and sit multiple-choice Welding Technology and Welding Inspection papers plus an Application of Standards exam (70% required) and an oral assessment, with a minimum of 50% on each written part and a satisfactory average. The syllabus covers welding processes and parameters, metallurgy and the heat-affected zone, design and ISO 2553 welding symbols, weld defects to ISO 6520, NDE methods (VT/PT/MT/RT/UT) and acceptance criteria to ISO 5817 with QA documentation. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample IIW IWI-S Practice Questions

Try these sample questions to review concepts for the IIW IWI-S exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In manual metal arc welding (MMA/SMAW), what is the primary function of the flux coating on the electrode?
A.To increase the welding current automatically
B.To shield the arc and molten pool from atmospheric contamination
C.To cool the weld metal rapidly after deposition
D.To act only as an electrical insulator on the core wire
Explanation: The flux coating decomposes in the arc to generate a shielding gas and forms a slag that protects the molten and solidifying weld metal from oxygen and nitrogen in the air. It also provides arc stabilisers, deoxidisers and alloying elements.
2Which shielding gas is normally used for the gas tungsten arc welding (GTAW/TIG) of carbon and stainless steels?
A.Pure carbon dioxide
B.Pure argon (or argon-helium mixes)
C.Oxygen
D.Compressed air
Explanation: TIG uses an inert gas, normally pure argon (sometimes argon-helium), to protect the tungsten electrode and weld pool. CO2 or oxygen would oxidise the tungsten and contaminate the weld, so reactive gases are not used for the TIG shield.
3In arc welding, increasing the arc voltage while holding current and travel speed constant will generally produce a weld bead that is:
A.Narrower and more convex
B.Wider and flatter
C.Deeper in penetration with no width change
D.Unchanged in profile
Explanation: Arc voltage is closely related to arc length. A higher voltage means a longer arc, which spreads the arc cone and produces a wider, flatter bead with reduced penetration. Lower voltage gives a narrower, more convex bead.
4In MIG/MAG welding, which metal-transfer mode is characterised by low heat input, no spatter when correctly tuned, and is preferred for thin sheet and positional welding?
A.Spray transfer
B.Globular transfer
C.Dip (short-circuit) transfer
D.Pulsed spray at high current only
Explanation: Dip (short-circuit) transfer deposits metal when the wire touches the pool and short-circuits, giving low average heat input suited to thin sections and out-of-position work. Spray transfer needs high current and is generally limited to flat/horizontal positions.
5Which welding process uses a continuously fed flux that is deposited ahead of the arc so that the arc burns beneath a granular blanket, hidden from view?
A.Submerged arc welding (SAW)
B.Flux-cored arc welding (FCAW)
C.Plasma arc welding (PAW)
D.Electroslag welding (ESW)
Explanation: In submerged arc welding the arc is 'submerged' under a layer of granular flux, which shields the weld, suppresses fume and arc glare and gives high deposition rates. It is a high-productivity process for thick plate in the flat position.
6Heat input in arc welding is calculated from arc energy multiplied by a thermal efficiency (k) factor. Which variables determine the arc energy per unit length?
A.Voltage, current and travel speed
B.Electrode diameter and gas flow rate
C.Preheat temperature and interpass temperature
D.Plate thickness and joint angle
Explanation: Arc energy per unit length = (voltage x current) / travel speed, usually expressed in kJ/mm. Heat input then applies the process thermal efficiency factor k. Slower travel or higher current/voltage increases heat input.
7When a welding procedure specifies DC electrode positive (DCEP / reverse polarity) for MMA welding, what is the principal effect compared with DC electrode negative?
A.Less heat at the workpiece and shallow penetration
B.Greater penetration into the workpiece
C.No effect on penetration
D.Automatic AC arc cleaning
Explanation: With DCEP (electrode positive), most of the arc heat is concentrated at the workpiece, giving deeper penetration; this is the common polarity for many basic MMA electrodes. DCEN concentrates heat at the electrode and gives shallower penetration.
8Why must low-hydrogen (basic) MMA electrodes be baked and stored in a heated quiver before use?
A.To improve their appearance
B.To control moisture pick-up and minimise diffusible hydrogen in the weld
C.To increase the core-wire diameter
D.To change the electrode polarity
Explanation: Basic flux coatings are hygroscopic and absorb atmospheric moisture, which is a source of diffusible hydrogen and hydrogen-induced cold cracking. Baking and heated storage keep the coating dry so hydrogen levels stay low.
9In a welding procedure specification (WPS), what does the term 'interpass temperature' mean?
A.The temperature of the plate before any welding starts
B.The temperature of the weld zone immediately before the next run is deposited
C.The maximum temperature of the arc
D.The post-weld heat treatment soak temperature
Explanation: Interpass temperature is the temperature of the weld and adjacent base metal just before the next pass is applied in a multi-run weld. A minimum maintains adequate preheat; a maximum limits heat input to protect HAZ toughness.
10Which process is most suited to high-deposition, mechanised welding of thick steel plate in the flat (PA) position?
A.Gas tungsten arc welding (TIG)
B.Submerged arc welding (SAW)
C.Manual oxy-acetylene welding
D.Micro-plasma welding
Explanation: SAW gives very high deposition rates and deep penetration and is normally mechanised, making it ideal for long, thick flat-position welds such as pressure vessel seams and structural plate. TIG and micro-plasma are low-deposition precision processes.

About the IIW IWI-S Exam

The International Welding Inspector — Standard (IWI-S) is the intermediate tier of the IIW/IAB welding inspection qualification under guideline IAB-041, sitting between IWI-Basic and IWI-Comprehensive. Candidates train through an Authorised Training Body and pass multiple-choice Welding Technology and Welding Inspection papers, an Application of Standards exam and an oral assessment. The written theory spans welding processes, metallurgy and the HAZ, design and symbols, weld defects, NDE methods, and codes and acceptance criteria.

Exam sponsor: International Institute of Welding (IIW) / International Authorisation Board (IAB), via Authorised Training Bodies. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Multi-part IAB exam: Welding Technology (WTE-S) and Welding Inspection (WIE-S) multiple-choice papers plus an Application of Standards exam, with an oral assessment; this free bank is 100 selected-response items focused on the written theory

Time Limit

Set by the IAB-approved examination body (multi-part written exams)

Passing Score

50% minimum per written part with a satisfactory average; 70% on the Application of Standards exam

Exam / Certification Fees

Varies by Authorised Training Body; the exam fee is charged separately from the course fee

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

18%

Welding Processes & Parameters

Arc processes (MMA, MIG/MAG, TIG, SAW), metal transfer, heat input and arc energy, polarity, consumables (ISO 2560) and process numbers (ISO 4063)

17%

Metallurgy & HAZ Behaviour

Steel classification, the HAZ, carbon equivalent, hydrogen cold cracking, hot cracking, lamellar tearing, preheat/PWHT, stainless and aluminium, toughness and hardness

17%

Design & Welding Symbols

ISO 2553 symbols (arrow/other side, fillet/butt, tail), joint preparation, fillet throat sizing, fatigue at weld toes, distortion and residual stress

18%

Weld Defects, Causes & Prevention

ISO 6520 classification, cracks, porosity, lack of fusion/penetration, undercut, overlap, slag and tungsten inclusions, misalignment, causes and prevention

15%

NDE Method Overview (RT/UT/MT/PT/VT)

Visual (ISO 17637), penetrant, magnetic particle, radiographic and ultrasonic testing, surface vs volumetric methods, IQI sensitivity, and ISO 9712 personnel

15%

Codes, Standards, Acceptance & QA Documentation

ISO 5817 levels B/C/D, ISO 3834, WPS/WPQR (ISO 15614), welder qualification (ISO 9606), ITPs, hold points, non-conformance, traceability and reporting

Preparing for the IIW IWI-S Exam

What You Need to Know

  • Passing score: 50% minimum per written part with a satisfactory average; 70% on the Application of Standards exam
  • Assessment: Multi-part IAB exam: Welding Technology (WTE-S) and Welding Inspection (WIE-S) multiple-choice papers plus an Application of Standards exam, with an oral assessment; this free bank is 100 selected-response items focused on the written theory
  • Time limit: Set by the IAB-approved examination body (multi-part written exams)
  • Exam / certification fees: Varies by Authorised Training Body; the exam fee is charged separately from the course fee Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

IIW IWI-S: Suggested Study Strategy

1Learn the ISO standards by purpose: ISO 6520 (classifying imperfections), ISO 5817 (acceptance levels B/C/D), ISO 2553 (symbols), ISO 17637 (visual testing), ISO 9606 (welder), ISO 15614 (procedure)
2Memorise that cracks, lack of fusion and lack of full penetration are not permitted at any ISO 5817 level, while volumetric/shape imperfections are limited by level
3Understand the four conditions for hydrogen cold cracking — diffusible hydrogen, hard microstructure, tensile stress and low temperature — and how preheat and low-hydrogen consumables break the chain
4Practise matching NDE methods to defect type: PT/MT for surface, RT for volumetric, UT for planar defects and depth, with ISO 17637 visual conditions (350 lux, eye within 600 mm, angle >=30 degrees)
5Drill fillet sizing: design throat a is about 0.7 times the leg for an equal-leg fillet, and know arrow-side vs other-side in ISO 2553 System A
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the written and oral exams

Frequently Asked Questions

What is the IIW IWI-S exam and how is it structured?

The International Welding Inspector — Standard (IWI-S) is the intermediate tier of the IIW/IAB inspector scheme (IAB-041). It uses multiple-choice Welding Technology and Welding Inspection papers plus an Application of Standards exam and an oral assessment, taken through an Authorised Training Body.

What score do I need to pass the IWI-S exam?

You generally need at least 50% on each written part and a satisfactory average, plus a minimum of 70% on the Application of Standards exam. The oral/practical assessment must also be passed. Exact arrangements are set by the IAB-approved examination body.

How is IWI-S different from IWI-Basic and IWI-Comprehensive?

IWI-S is the intermediate level: deeper than IWI-Basic but below the Comprehensive tier. It expects working knowledge of welding processes, metallurgy, defects, NDE method selection and acceptance criteria such as ISO 5817, without the advanced fitness-for-service and inspection-management depth of IWI-C.

What topics does the IWI-S written exam cover?

It covers welding processes and parameters, metallurgy and the heat-affected zone, design and ISO 2553 welding symbols, weld defects and their causes (ISO 6520), NDE methods (VT/PT/MT/RT/UT), and codes, standards and acceptance criteria including ISO 5817, with QA documentation.

How long does it take to prepare for IWI-S?

The IWI-S course typically runs about eight days face-to-face, or roughly eight weeks online plus practical training, through an IIW Authorised Training Body. Many candidates add several weeks of self-study and practice-question review before the exams.

Is this free IWI-S practice as good as paid prep?

Our 100 practice questions cover the same written theory domains as the IWI-S syllabus — processes, metallurgy, symbols, defects, NDE and acceptance criteria — with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.