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.

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2026 Statistics

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 test your IIW IWI-S exam readiness. 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 Practice Questions

Verified exam format metadata for IIW International Welding Inspector — Standard (IWI-S) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.

100+ Free IIW IWI-S Practice Questions

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Key Facts: IIW IWI-S Exam

Sample IIW IWI-S Practice Questions

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