CSWIP 3.1 Welding Inspector Practice Questions — 10 Free (2026)

A partial-penetration single-V butt weld is specified with the dimension s 8 on a 12 mm plate. What does the figure state?

• A. The weld may vary between 8 and 12 mm as access allows
• B. The required depth of penetration of the weld is 8 mm ✓
• C. The width of the finished weld cap must measure 8 mm
• D. Eight separate runs must be deposited to fill the groove
• E. The weld must be inspected eight times before acceptance

The s prefix dimensions the penetration depth of a butt weld: here the design requires fusion 8 mm into the 12 mm joint, a deliberate partial-penetration detail. It is a minimum design requirement, not a tolerance band, and it says nothing about cap width, run count or inspection frequency; those live in procedure and quality documents. CSWIP 3.1 course material (TWI WIS5), 9.9

What does the separation of filler addition from arc heat give the TIG welder that consumable-electrode processes cannot?

• A. Freedom from every qualification requirement in the codes
• B. The ability to weld without any shielding gas at all
• C. A guarantee that porosity can never form in the deposit
• D. Exactly twice the travel speed of MAG welding at precisely the same current setting on each and every possible kind of welded joint
• E. Heat can be adjusted without changing deposition, and filler dosed without changing heat, decoupling the two variables entirely ✓

In MMA and MAG the electrode is the filler, so heat and deposition rise and fall together; TIG unpicks the linkage, letting the welder hold fusion conditions while adding exactly the metal the joint needs, the essence of its control on roots and thin work. Qualification, gas necessity, porosity immunity and speed doubling are all unaffected or false. CSWIP 3.1 course material (TWI WIS5), 12.7

For a full penetration butt weld, what is the design throat thickness normally taken to be?

• A. The width measured across the face of the completed capping run
• B. The height of the excess weld metal standing above the plate level
• C. Half of the plate thickness, whatever preparation has been used
• D. The thickness of the thinner of the parts joined at the weld line ✓
• E. The combined length of both weld toes measured around the joint

Design strength of a full penetration butt rests on the section it restores, which is the thickness of the thinner member at the joint; excess metal above the surfaces is disregarded. Cap width and toe positions are surface geometry, and no half-thickness convention exists for full penetration work. This is why butt welds are commonly said to develop the full strength of the parts they join. CSWIP 3.1 course material (TWI WIS5), 2.5

Cavities, cracks, unfused regions, solid inclusions and faults of shape are examples of what?

• A. The five welding positions recognised by all the approval standards
• B. The stages every weld passes through while it cools to ambient
• C. Main groups into which weld imperfections are classified by type ✓
• D. The five essential variables listed on every welding procedure
• E. Categories of welding process defined by their shielding method

These are the principal imperfection groupings the classification standard uses, and the chapter structure of most inspection training follows them. Welding positions, cooling stages, procedure variables and process families are different lists entirely; recognising which family an indication belongs to is the first step of identification. CSWIP 3.1 course material (TWI WIS5), 3.1

Which physical properties of a material influence how much it distorts during welding?

• A. Coefficient of thermal expansion and thermal conductivity, together with yield strength and stiffness at temperature ✓
• B. Its colour and surface finish
• C. Its density and its electrical resistance, which together determine how much the metal moves as the welding heat passes through the joint region
• D. Only its tensile strength at ambient temperature, all other properties being irrelevant to the distortion produced during any welding operation
• E. The number of alloying elements the material contains, more elements always producing proportionally greater distortion in the completed fabrication

A material that expands a great deal per degree and conducts heat poorly concentrates steep gradients and large movements, while its yield strength and stiffness govern how much of that becomes plastic upset, which is why austenitic stainless distorts far more than carbon steel. Colour, density with resistance, ambient strength alone and element counts do not govern it. CSWIP 3.1 course material (TWI WIS5), 19.2

Which dimensional checks are made on plate at receiving inspection?

• A. Length, width and thickness measured against the ordered sizes and their tolerances ✓
• B. Only the weight stencilled on the plate by the rolling mill
• C. The temperature of the plate at the moment of unloading
• D. The number of plates that fit on one delivery vehicle
• E. The hardness measured at the exact geometric centre point of each and every single plate

Dimensions mean the ordered sizes: length, width and above all thickness, measured with calibrated equipment and judged against the specification's tolerances, since undersize plate undermines the design and oversize wastes money and weight. Stencilled weight is a cross-check at best, and temperature, load counts and centre hardness are not receiving dimensions. CSWIP 3.1 course material (TWI WIS5), 7.5

A heavy T-butt connection is to be welded in 60 mm plate under high restraint. What precautions address lamellar tearing?

• A. No precautions are needed, since lamellar tearing occurs only in plate thinner than about 20 mm and this joint is far outside that thickness range
• B. Increase the weld size substantially
• C. Specify through-thickness tested plate, consider buttering, choose a detail that reduces through-thickness strain, and examine the plate ultrasonically ✓
• D. Weld the joint as quickly as possible so the plate has no time to tear before the weld metal has fully solidified and cooled to ambient temperature
• E. Apply a heavy coat of primer to both plate surfaces before welding so that the layers within the plate are held firmly together during the whole operation

The response combines material, design and inspection: plate certified for through-thickness ductility, a detail that steers shrinkage away from the thickness direction, buttering where appropriate, and ultrasonic examination before and after welding. Thin-plate immunity is false, larger welds increase strain, speed does not help, and primer holds nothing together. CSWIP 3.1 course material (TWI WIS5), 17.5

How does travel speed shape a MAG weld at fixed electrical settings?

• A. It only changes how warm the torch handle becomes in the hand
• B. Travelling any faster always improves the fusion dramatically by stirring the whole weld pool more thoroughly along the way
• C. Hurrying narrows the bead and risks undercut and poor fusion; lingering widens it, piling metal and raising heat input ✓
• D. Travel speed is fixed by the machine and cannot be varied
• E. Slower travel makes the finished weld metal harder than glass

Speed divides the arc's energy along the joint: outrun the pool and the starved bead narrows with undercut and fusion risks, crawl and the bead swells while heat input climbs with all its consequences. Handle temperature is irrelevant, stirring is not how fusion works, manual travel is fully in the welder's hands, and glass-hardness is fantasy. CSWIP 3.1 course material (TWI WIS5), 13.2

What burn hazards other than the arc exist around welding work?

• A. None; the arc itself is the only source of burns in any welding or cutting operation carried out in a fabrication workshop or on a site
• B. Only the electrode holder becomes hot
• C. Hot metal and slag, recently welded components that look cold, spatter, torch and nozzle parts, and preheated or heat-treated items ✓
• D. Only the welding cables become warm
• E. Only the shielding gas becomes hot as it passes through the torch

Steel at 300 degrees looks exactly like steel at 20 degrees, so handling a component welded minutes earlier is a classic burn, alongside falling slag, spatter, hot nozzles and preheated work, which is why gloves are worn and hot items are marked or barriered. Claiming the arc is the only source, or limiting the hazard to holders, cables or gas, understates it badly. CSWIP 3.1 course material (TWI WIS5), 21.3

What baking and holding regime applies to basic low-hydrogen electrodes?

• A. They are baked in the workshop oven at whatever temperature happens to be set, for as long as the welder thinks the weather demands that day
• B. No baking is ever required
• C. Baking to the manufacturer's stated temperature and time, then holding in a heated oven and issuing in heated quivers with exposure limits ✓
• D. They are dried in sunlight on the bench
• E. They are soaked in oil before use so that the covering is sealed against the ingress of any atmospheric moisture during the working shift

The maker sets the numbers, commonly a bake in the region of 300 to 400 degrees for a stated time, followed by holding at a lower temperature and issue in heated quivers with limits on how long an electrode may stay exposed. Improvised temperatures, no baking, sunlight and oil soaking each destroy the hydrogen control the system exists to provide. CSWIP 3.1 course material (TWI WIS5), 16.3