How is the IIW International Welding Engineer (IWE) exam structured?

The IWE is assessed by separate end-of-module written examinations (multiple-choice plus structured or essay questions), with oral exams where applicable, across four modules: welding processes and equipment, materials and their behaviour, construction and design, and fabrication and quality. All four modules must be passed.

What score do I need to pass the IWE module exams?

The passing score is set per module by the Authorised National Body (ANB), commonly around 60% on each written module exam, and you must pass all four modules. Because the diploma spans processes, metallurgy, design and quality, balanced study across every module is essential.

Who is eligible for the IWE diploma?

The standard access route is at postgraduate engineering level (an engineering degree or equivalent), and candidates must complete an IIW-approved IWE course of over 400 teaching hours at an Approved Training Body. Alternative experience-based access routes exist under IAB rules.

What topics does the IWE cover?

It covers four modules: welding processes and equipment; materials and their behaviour during welding (metallurgy, weldability, cracking, heat treatment); construction and design (joint design, symbols, fatigue, distortion); and fabrication, applications engineering and quality (coordination, WPS, NDE, codes and standards).

Is the IWE the same as the AWS CWI?

No. The IWE is the IIW/IAB welding-coordination engineer diploma recognised internationally under ISO 3834 and ISO 14731, while the AWS CWI is a US welding-inspector certification. They serve different roles, though many engineers hold both.

Is this free IWE practice as good as paid prep?

Our 100 practice questions span all four IWE modules with engineer-level depth, a teaching explanation for every answer, and free daily AI tutor interactions. All content is free forever and updated for 2026.

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2026 Statistics

Key Facts: IIW IWE Exam

100

Practice Questions

OpenExamPrep

Examined Modules

IIW/IAB

400+ hrs

Minimum Course Hours

IIW IAB-252

MCQ + structured

Exam Format

IIW/IAB

Engineer

Highest Coordination Diploma

IIW

ISO 3834/14731

Recognised Coordinator

IIW

The IIW International Welding Engineer (IWE) is the highest welding-coordination diploma of the International Institute of Welding (IIW), administered through the International Authorisation Board (IAB) and examined by Authorised National Bodies (ANBs). Candidates attend an approved course of over 400 teaching hours and pass written end-of-module exams (multiple-choice plus structured questions) across four modules: Welding Processes & Equipment, Materials & Their Behaviour During Welding, Construction & Design, and Fabrication, Applications Engineering & Quality. Standard access is at postgraduate engineering level. The diploma is recognised internationally as the top welding-coordination qualification under ISO 3834 and ISO 14731. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample IIW IWE Practice Questions

Try these sample questions to test your IIW IWE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the ISO 4063 process-number system used throughout IIW training, which reference number designates manual metal arc welding (MMA/SMAW)?

A.111

B.121

C.135

D.141

Explanation: ISO 4063 assigns process number 111 to manual metal arc welding with covered electrode (MMA/SMAW). IIW course material and welding procedure specifications reference these numbers internationally, so an IWE must know them precisely.

2Which ISO 4063 number designates TIG (gas tungsten arc) welding with solid filler or no filler?

A.131

B.135

C.141

D.151

Explanation: Number 141 is tungsten inert gas (TIG/GTAW) welding. It uses a non-consumable tungsten electrode under an inert shielding gas, giving high-quality, low-spatter welds favoured for thin sections and root passes.

3What is the primary functional difference between MIG (131) and MAG (135) gas metal arc welding?

A.MIG uses an inert shielding gas while MAG uses an active (reactive) shielding gas

B.MIG uses a tungsten electrode while MAG uses a consumable wire

C.MIG is only for aluminium and MAG only for titanium

D.MIG operates on DC and MAG operates exclusively on AC

Explanation: Both are gas metal arc processes with a continuously fed consumable wire. MIG (131) uses inert gas such as pure argon or argon-helium, while MAG (135) uses an active gas such as CO2 or argon-CO2 mixtures that participates chemically in the arc. The distinction is the shielding-gas chemistry.

4In GMAW, increasing the arc voltage (within the operating range) while holding wire feed speed constant will primarily change the weld in which way?

A.Produce a wider, flatter bead with shallower penetration

B.Produce a narrow, high bead with deep finger penetration

C.Have no effect on bead geometry

D.Increase deposition rate proportionally to voltage

Explanation: In GMAW arc voltage chiefly controls arc length and therefore bead width and flatness. Higher voltage lengthens the arc, spreads the heat and gives a wider, flatter bead with reduced penetration. Wire feed speed (current) controls deposition rate and penetration.

5Spray transfer in GMAW of steel is generally achieved only above a certain current with which shielding gas?

A.100% CO2

B.Argon-rich mixtures (typically at least about 80% argon)

C.Pure helium

D.Nitrogen

Explanation: Axial spray transfer requires an argon-rich shielding gas (commonly 80% argon or more) and current above a material- and diameter-dependent transition value. Pure CO2 produces only short-circuit and globular transfer because of its higher arc voltage and surface-tension effects.

6Which metal-transfer mode in GMAW is characterised by the wire repeatedly touching the weld pool, short-circuiting, and is best suited to thin sheet and positional welding?

A.Spray transfer

B.Globular transfer

C.Short-circuiting (dip) transfer

D.Pulsed spray transfer

Explanation: Short-circuiting (dip) transfer deposits metal during repeated short circuits at low voltage and current, giving a small, fast-freezing pool ideal for thin material and out-of-position work. Roughly 50-200 short circuits per second occur.

7In submerged arc welding (SAW, process 121), what mainly protects the molten pool from the atmosphere?

A.An inert gas shroud from the torch

B.A blanket of granular flux that melts to form slag and gas

C.The covering on a stick electrode

D.A vacuum chamber surrounding the joint

Explanation: SAW feeds a continuous bare wire under a blanket of granular flux. The arc is submerged beneath the flux, which melts to form a protective slag and gas, prevents spatter and UV, and allows very high deposition rates on thick sections.

8Electron beam welding (EBW) is normally performed in a high vacuum primarily to:

A.Reduce the cost of shielding gas

B.Prevent scattering of the electron beam and avoid contamination of the weld

C.Allow the operator to observe the pool more easily

D.Increase the workpiece temperature before welding

Explanation: In a vacuum the electrons travel without scattering off gas molecules, so the beam stays tightly focused for deep, narrow welds, and the pool is protected from oxidation and nitrogen pickup. This yields high depth-to-width ratios and low distortion.

9In resistance spot welding, the heat generated at the faying surfaces is described by which relationship?

A.Q = I^2 R t (current squared times resistance times time)

B.Q = V / R

C.Q = m c dT only

D.Q proportional to arc voltage

Explanation: Resistance welding heat follows Joule's law, Q = I^2 R t: heat is proportional to the square of the welding current, the contact/bulk resistance, and the weld time. Because current is squared, it is the most influential parameter on nugget formation.

10What is the main purpose of the flux covering on a manual metal arc (MMA, 111) electrode?

A.Only to colour-code the electrode

B.To provide gas shielding, slag protection, arc stabilisers and alloying additions

C.To increase the electrical resistance of the core wire

D.To act purely as a handle insulator

Explanation: The MMA electrode covering performs several jobs at once: it decomposes to form shielding gas, produces a protective slag, adds arc stabilisers and deoxidisers, and can transfer alloying elements to the weld metal. Its formulation (rutile, basic, cellulosic) sets running characteristics and hydrogen level.

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100+ Free IIW IWE Practice Questions

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