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Key Facts: IIW IWT Exam

100

Practice Questions

OpenExamPrep

4 modules

Written Exams

IIW/IAB

60%

Pass Mark per Module

IIW/IAB

Technologist

One Tier Below IWE

ISO 14731

Global

IIW International Diploma

IIW

ANB

Delivered by National Bodies

IAB

The IIW International Welding Technologist (IWT) is a globally recognised welding-coordination diploma issued under the International Institute of Welding's International Authorisation Board (IAB) scheme and delivered through Authorised National Bodies. It sits one tier below the International Welding Engineer (IWE) and above the International Welding Specialist (IWS), and is assessed by four written multiple-choice module exams: Module 1 welding processes and equipment, Module 2 materials and their behaviour during welding, Module 3 construction and design, and Module 4 fabrication and applications engineering. Candidates must achieve at least 60% in each module to qualify for registration as an IWT, and per ISO 14731 the IWT holds 'specific' technical knowledge for coordinating welding within a defined product range. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample IIW IWT Practice Questions

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

1In the gas metal arc welding (GMAW) spray transfer mode, how is metal transferred from the electrode to the weld pool?

A.As large droplets that short-circuit the arc at regular intervals

B.As a fine stream of tiny droplets propelled axially across the arc without short-circuiting

C.Only by gravity when welding in the flat position

D.Through globular drops detaching mainly from arc-blow forces

Explanation: Spray transfer occurs above a current threshold (the transition current) with argon-rich shielding, producing a fine, axially-directed stream of small droplets and a stable, spatter-free arc. It is used for thicker material in the flat and horizontal-fillet positions.

2Which shielding gas is REQUIRED for gas tungsten arc welding (GTAW/TIG) of most metals to protect the tungsten electrode?

A.Pure carbon dioxide

B.An oxidising argon-oxygen mixture

C.An inert gas such as argon or helium

D.Compressed air

Explanation: GTAW uses a non-consumable tungsten electrode that must be shielded by an inert gas, normally argon or helium, to prevent oxidation and contamination of the electrode and weld. Active gases such as CO2 or oxygen would oxidise the tungsten and the pool.

3A welding power source described as having a 'constant current' (drooping) static characteristic is most appropriate for which process?

A.Gas metal arc welding (GMAW) with spray transfer

B.Manual metal arc welding (MMA/SMAW)

C.Submerged arc welding with a single wire and high deposition

D.Flux-cored arc welding on a wire feeder

Explanation: MMA/SMAW uses a constant-current (drooping) source so that small changes in arc length produced by the welder's hand cause only small changes in current, keeping the burn-off rate stable. Wire-fed processes use constant-voltage sources for self-regulating arc length.

4In submerged arc welding (SAW), what is the primary function of the granular flux?

A.To act as the filler metal that forms the weld bead

B.To provide arc shielding, slag protection and metallurgical refinement while concealing the arc

C.To cool the workpiece rapidly and increase the cooling rate

D.To electrically insulate the contact tip from the wire

Explanation: In SAW the arc burns beneath a blanket of granular flux that shields the molten metal from the atmosphere, forms a protective slag, can add alloying elements, and refines the weld metal. The flux also conceals the arc, giving the process its name.

5Why is direct current electrode positive (DCEP / reverse polarity) generally preferred for manual metal arc welding with most coated electrodes?

A.It concentrates more heat in the electrode to increase deposition rate

B.It produces a cleaning action and good penetration with deeper fusion into the workpiece

C.It eliminates the need for any flux coating

D.It allows welding without a return (earth) lead

Explanation: With DCEP the workpiece is the cathode region receiving about two-thirds of the heat, giving good penetration, and the polarity also provides a useful cleaning action with many electrode types. Most general-purpose MMA electrodes are designed to run on DCEP.

6What does the 'duty cycle' of a welding power source specify?

A.The maximum open-circuit voltage permitted

B.The percentage of a ten-minute period the source can deliver a stated current without overheating

C.The number of electrodes that can be used before maintenance

D.The ratio of arc voltage to arc current

Explanation: Duty cycle is the proportion of a 10-minute reference period during which the power source can deliver a rated current without exceeding safe temperatures. For example, 60% duty cycle at 300 A means 6 minutes welding and 4 minutes idle in every 10-minute period.

7In oxy-acetylene welding, which flame setting is normally used for welding plain carbon steel?

A.A strongly oxidising flame

B.A neutral flame with balanced oxygen and acetylene

C.A heavily carburising (excess acetylene) flame

D.A flame using compressed air instead of oxygen

Explanation: A neutral flame, produced by approximately equal volumes of oxygen and acetylene, neither adds carbon nor oxidises the steel, so it is the standard setting for welding plain carbon steel. Oxidising flames are used for some brasses and carburising flames for hardfacing or certain alloys.

8Which electrode coating type gives the best low-hydrogen weld metal and is therefore preferred for higher-strength and thick steels?

A.Rutile (titania) coating

B.Cellulosic coating

C.Basic (low-hydrogen) coating

D.Acid coating

Explanation: Basic (low-hydrogen) coated electrodes, based on calcium carbonate and calcium fluoride, produce weld metal with very low diffusible hydrogen and good toughness, which reduces the risk of hydrogen cracking in higher-carbon and thicker steels. They must be kept dry and are often baked before use.

9What is the main reason for using a shielding gas mixture of argon plus about 20% CO2 (rather than pure CO2) for GMAW of structural steel?

A.It removes the need for any electrode wire

B.It gives a more stable arc with less spatter and allows spray transfer

C.It increases diffusible hydrogen for deeper penetration

D.It prevents the use of constant-voltage power sources

Explanation: Adding argon to CO2 stabilises the arc, reduces spatter and enables true spray transfer at higher currents, improving bead appearance and deposition. Pure CO2 gives a harsher globular arc with more spatter though it is cheaper and gives deeper penetration.

10In resistance spot welding, the heat generated at the faying surfaces is governed primarily by which relationship?

A.Heat is proportional to voltage only

B.Heat equals current squared times resistance times time (I squared R t)

C.Heat depends only on electrode force

D.Heat is independent of the contact resistance

Explanation: Resistance welding heat follows Q = I^2 R t, so it rises with the square of the current, with the dynamic resistance at the interface, and with weld time. Because resistance is highest at the faying surfaces, the nugget forms there.

About the IIW IWT Exam

The IIW International Welding Technologist (IWT) is a globally recognised welding-coordination diploma, one tier below the International Welding Engineer (IWE) and above the International Welding Specialist (IWS). It is awarded after passing four written multiple-choice module exams covering welding processes and equipment, materials and their behaviour during welding, construction and design, and fabrication and applications engineering, each requiring a minimum of 60%.

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

Assessment

Four written multiple-choice module exams (Module 1 processes & equipment, Module 2 materials & behaviour, Module 3 construction & design, Module 4 fabrication & applications engineering), each requiring at least 60% to pass; this practice bank is 100 selected-response items across all four modules

Time Limit

Set by the Authorised National Body; each module written exam typically runs from about 30 minutes up to a few hours

Passing Score

60% minimum in each of the four modules

Exam / Certification Fees

Per-module exam fee set by the ANB (e.g. ~Rs.12,500/module in India; retakes ~US$50 + tax in Canada)

Exam sponsor website

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

Official sources

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.

25%

Module 1: Welding Processes & Equipment

MMA, MIG/MAG, TIG, SAW, FCAW, oxy-fuel, plasma, resistance and solid-state welding, power-source characteristics, polarity, duty cycle, shielding gases, consumables, heat input and safety

25%

Module 2: Materials & Their Behaviour During Welding

Welding metallurgy, carbon equivalent and weldability, the HAZ, hydrogen and solidification cracking, preheat and PWHT, stainless steels, aluminium, cast iron and mechanical testing

25%

Module 3: Construction & Design

Welded joint design, fillet and butt-weld throat geometry, ISO 2553 symbols, weld loading and weld groups, residual stress, distortion, fatigue and brittle fracture

25%

Module 4: Fabrication & Applications Engineering

Quality management (ISO 3834/14731), WPS/WPQR, welder qualification (ISO 9606), ISO 5817 acceptance, NDT (VT/MT/PT/RT/UT), distortion control, repair and codes/standards

Preparing for the IIW IWT Exam

What You Need to Know

Passing score: 60% minimum in each of the four modules
Assessment: Four written multiple-choice module exams (Module 1 processes & equipment, Module 2 materials & behaviour, Module 3 construction & design, Module 4 fabrication & applications engineering), each requiring at least 60% to pass; this practice bank is 100 selected-response items across all four modules
Time limit: Set by the Authorised National Body; each module written exam typically runs from about 30 minutes up to a few hours
Exam / certification fees: Per-module exam fee set by the ANB (e.g. ~Rs.12,500/module in India; retakes ~US$50 + tax in Canada) Official sources

Using Our Practice Resources

Work through all 100 available questions
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IIW IWT: Suggested Study Strategy

1Treat the four modules as four separate exams - you need at least 60% in each, so do not neglect a weaker module

2Memorise the IIW carbon equivalent formula CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 and how it drives preheat decisions

3Know the cold-cracking trio (diffusible hydrogen, hard microstructure, tensile stress) and how preheat, low-hydrogen consumables and PWHT remove each factor

4Practise fillet-weld throat (a = 0.7 x leg) and simple weld-group calculations until they are automatic for Module 3

5Learn the key standards: ISO 2553 (symbols), ISO 9606 (welder qualification), ISO 15614 (procedures), ISO 5817 (acceptance), ISO 3834 and ISO 14731 (quality and coordination)

6Complete all 100 practice questions and review every miss with the AI tutor before sitting your module exams

Frequently Asked Questions

How is the IIW IWT exam structured and what score do I need to pass?

The International Welding Technologist diploma is assessed by four written multiple-choice module exams covering welding processes and equipment, materials and behaviour during welding, construction and design, and fabrication and applications engineering. You must achieve at least 60% in each of the four modules to qualify.

What is the difference between IWT, IWE and IWS?

These are the IIW welding-coordination levels. The International Welding Engineer (IWE) holds comprehensive technical knowledge, the International Welding Technologist (IWT) holds specific technical knowledge one tier below, and the International Welding Specialist (IWS) holds basic technical knowledge, as defined in ISO 14731.

Who can take the IWT diploma?

Entry is set by each IIW Authorised National Body and usually requires an engineering diploma (Level 4 / polytechnic or university) plus completion of an approved IWT training course. Some access routes allow entry based on prior welding experience and education.

How much does the IWT cost?

Fees vary by country and Authorised National Body. Course-plus-exam packages commonly run to several thousand US dollars, with per-module exam fees set locally (for example around Rs.12,500 per module in India, and retakes around US$50 plus tax in Canada).

How long do I have to complete all four modules?

Most Authorised National Bodies require all four module exams to be passed within a set period, commonly three years from starting the programme. Check the exact time limit with your ANB.

Is this free IWT practice as good as paid prep?

Our 100 practice questions span all four IWT modules at technologist depth, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.

Free Practice Questions for IIW IWT

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