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2026 Statistics
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 test your IIW IWT exam readiness. 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.
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