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CWB Welding Inspector Level 2 study materials
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CWB Welding Inspector Level 2 practice questions

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Question 1Welding fundamentals and processes

In shielded metal arc welding, what is the primary function of the flux coating on the electrode?

  1. It generates shielding gas and forms slag to protect the molten weld metal Correct answer.
  2. It provides the filler metal that fills the joint
  3. It increases the electrical conductivity of the core wire
  4. It cools the weld pool rapidly to refine the grain structure

Explanation

The flux coating decomposes in the arc to release shielding gases and later forms a slag layer that excludes atmospheric oxygen and nitrogen from the solidifying weld. Together these protect the molten metal from contamination. The core wire, not the coating, supplies most of the filler metal.

Question 2Welding fundamentals and processes

Which welding process uses a continuously fed consumable electrode with a granular flux blanket but no external shielding gas?

  1. Submerged arc welding Correct answer.
  2. Gas tungsten arc welding
  3. Shielded metal arc welding
  4. Gas metal arc welding

Explanation

Submerged arc welding feeds a bare consumable wire into a deep blanket of granular flux that melts to shield and slag the arc. No separate shielding gas cylinder is required because the arc burns beneath the flux. The other processes rely on gas shielding or a coated electrode.

Question 3Welding fundamentals and processes

In gas tungsten arc welding, which electrode type is preferred for direct current electrode negative (DCEN) welding of carbon steel?

  1. Pure tungsten
  2. Aluminum alloy
  3. Zirconiated tungsten
  4. Thoriated or other oxide-doped tungsten Correct answer.

Explanation

Oxide-doped tungsten electrodes such as thoriated types have higher electron emissivity, so they start more easily and carry more current without melting back. They are the standard choice for DCEN on steels. Pure tungsten is used mainly on AC for aluminum, and aluminum is not an electrode material.

Question 4Welding fundamentals and processes

What does the term 'duty cycle' mean for an arc welding power source?

  1. The ratio of open-circuit voltage to arc voltage during welding
  2. The time required for the electrode to melt from full to stub length
  3. The percentage of a ten-minute period that the machine can operate at its rated current without overheating Correct answer.
  4. The fraction of total weld length completed in the flat position

Explanation

Duty cycle is defined over a standard ten-minute base period as the percentage of time a power source can deliver a stated current without exceeding its thermal limit. A 60 percent rating at 200 A means six minutes of welding followed by four minutes of cooling. Exceeding the rated duty cycle leads to overheating.

Question 5Welding fundamentals and processes

Which type of power source characteristic is required for the self-regulating behavior of gas metal arc welding with a constant-voltage supply?

  1. A rising volt-ampere curve
  2. A flat or slightly drooping volt-ampere curve Correct answer.
  3. A steeply drooping volt-ampere curve
  4. A constant-current curve with high open-circuit voltage

Explanation

A flat characteristic means small changes in arc length produce large changes in current, which rapidly restores the arc length and stabilizes the process. This self-regulation is the basis of constant-voltage GMAW. Drooping curves, by contrast, suit constant-current processes such as SMAW.

Question 6Welding fundamentals and processes

Which welding position is designated as 4F in fillet weld terminology?

  1. Vertical
  2. Flat
  3. Overhead Correct answer.
  4. Horizontal

Explanation

In fillet weld position numbering, 1 is flat, 2 is horizontal, 3 is vertical, and 4 is overhead. The letter F indicates a fillet weld, so 4F means an overhead fillet weld. This coding lets procedures and welder qualifications be specified precisely.

Question 7Welding fundamentals and processes

Which gas is most commonly used as the shielding gas for gas metal arc welding of carbon steel in the short-circuiting transfer mode?

  1. Pure nitrogen
  2. Pure oxygen
  3. A carbon dioxide or argon-carbon dioxide mixture Correct answer.
  4. Pure helium

Explanation

Carbon dioxide, often blended with argon, provides good shielding and stable short-circuiting transfer on carbon steel at economical cost. It also promotes adequate penetration and bead wetting. Oxygen, helium, and nitrogen are not used as the primary shield for this application.

Question 8Welding fundamentals and processes

What is the main purpose of preheating a thick carbon steel joint before welding?

  1. To eliminate the need for any post-weld inspection
  2. To increase the cooling rate and refine the weld metal
  3. To slow the cooling rate and help prevent hydrogen-assisted cracking Correct answer.
  4. To reduce the electrode deposition rate

Explanation

Preheating raises the base metal temperature so the weld cools more slowly, which allows hydrogen to escape and reduces the formation of hard, crack-susceptible microstructures. It is especially important for thick sections and higher-carbon or higher-strength steels. Preheating does not replace inspection.

Question 9Welding fundamentals and processes

A welder is using a constant-current SMAW power source rated 250 A at 60 percent duty cycle. If the welder needs to run continuously at a higher current, what is the practical consequence?

  1. The arc voltage automatically rises to compensate
  2. The open-circuit voltage drops to zero
  3. The electrode coating will not melt
  4. The power source may overheat because the rated duty cycle is exceeded Correct answer.

Explanation

Duty cycle ratings are thermal limits; drawing more current than the rating for a longer time than allowed causes the machine to overheat and possibly trip or fail. The welder must either reduce the current or reduce the arc-on time proportion. Duty cycle is not self-correcting.

Question 10Welding fundamentals and processes

During GMAW spray transfer on carbon steel, a welder notices the transfer becomes unstable and spatters heavily after switching to a 100 percent CO2 shield. What is the most likely cause?

  1. CO2 raises the arc voltage beyond the machine limit
  2. CO2 eliminates the need for a return lead
  3. CO2 causes the wire feed speed to increase automatically
  4. CO2 does not support true spray transfer, so the mode reverts to globular or short-circuiting Correct answer.

Explanation

True spray transfer requires a high argon content in the shielding gas; carbon dioxide promotes a cooler arc and does not sustain the fine axial spray. Using pure CO2 at spray parameters typically produces globular transfer with heavy spatter. A gas with at least about 80 percent argon is normally needed for spray.

Question 11Welding fundamentals and processes

A welder is welding 6 mm carbon steel plate in the vertical-up position with SMAW and finds the weld pool running ahead of the arc. Which adjustment best improves control?

  1. Switch to a larger diameter electrode at higher amperage
  2. Reduce the current and use a shorter arc with a slight weave Correct answer.
  3. Increase the current and lengthen the arc
  4. Increase travel speed to a fast straight drag

Explanation

A running pool in vertical-up welding usually signals excessive heat input, so lowering the current and shortening the arc lets the pool freeze faster. A controlled weave also helps place metal where it is needed. Increasing current or electrode size would worsen the problem.

Question 12Welding fundamentals and processes

Why is alternating current commonly used for GTAW of aluminum?

  1. It eliminates the need for any shielding gas
  2. It prevents the formation of an oxide layer entirely
  3. It keeps the tungsten electrode cooler than DCEN at the same current Correct answer.
  4. The electrode-negative half provides cleaning action while the electrode-positive half provides penetration

Explanation

On AC the current alternates, and the electrode-positive portion, though brief, allows the oxide to be broken up by cathode cleaning. It also shares the heat load so the tungsten is less likely to melt back than under pure DCEP. The other options misstate the physics.

Question 13Welding fundamentals and processes

Which condition most directly promotes hydrogen-assisted cold cracking in a high-strength steel weld?

  1. Low hydrogen content, slow cooling, and low restraint
  2. Excessive preheat and high interpass temperature
  3. Use of a basic coated electrode stored in a heated oven
  4. High hydrogen content, fast cooling, and high restraint Correct answer.

Explanation

Cold cracking requires a combination of diffusible hydrogen, a susceptible hard microstructure, and tensile stress from restraint. Fast cooling in thick, restrained joints creates hard martensitic zones, and high hydrogen raises the risk further. Controlling these three factors together prevents cracking.

Question 14Welding fundamentals and processes

What distinguishes globular transfer from short-circuiting transfer in GMAW?

  1. Short-circuiting transfer occurs only with pure helium shielding
  2. Globular transfer uses larger droplets that detach without the wire touching the pool Correct answer.
  3. Short-circuiting transfer uses a higher arc voltage than globular transfer
  4. Globular transfer requires a non-consumable electrode

Explanation

In globular transfer, metal transfers as large droplets across an open arc, and the wire does not touch the pool. Short-circuiting transfer, by contrast, relies on the wire dipping into the pool and extinguishing the arc momentarily. These are distinct modes with different parameter windows.

Question 15Welding fundamentals and processes

A welder must join thin sheet with minimal distortion and no spatter. Which process and mode combination is most suitable?

  1. SMAW with a cellulosic electrode at high current
  2. SAW with a large flux blanket
  3. FCAW with a rutile flux at high deposition
  4. GTAW with a small arc gap and low current Correct answer.

Explanation

GTAW offers precise, low-heat-input control with no spatter and excellent arc stability, making it well suited to thin sheet where distortion matters. The other processes generally add more heat and spatter or require heavier sections. Selecting the process around the joint requirements is a core welding decision.

Question 16Welding fundamentals and processes

What is the effect of increasing wire feed speed in GMAW when all other parameters are held constant?

  1. Arc voltage increases and deposition rate decreases
  2. Welding current increases and deposition rate increases Correct answer.
  3. Shielding gas flow increases automatically
  4. Welding current decreases and penetration increases

Explanation

In constant-voltage GMAW, wire feed speed sets the current: feeding wire faster drives more current, which melts the wire faster and raises deposition. The arc voltage is set independently by the voltage control. Shielding gas flow is set by a separate regulator.

Question 17Welding fundamentals and processes

Which electrode covering type is classified as low hydrogen and is recommended for welding high-strength steels?

  1. Cellulosic (E6010 type)
  2. High titania with iron powder
  3. Rutile (E6013 type)
  4. Basic (low hydrogen, E7018 type) Correct answer.

Explanation

Basic coverings are formulated to produce low diffusible hydrogen and a tough, crack-resistant weld, which is why E7018-type electrodes are specified for high-strength and restrained joints. Cellulosic and rutile coverings carry higher hydrogen and are used for other purposes. Proper storage in heated ovens preserves the low-hydrogen condition.

Question 18Welding fundamentals and processes

A submerged arc weld shows a deep, narrow penetration profile with a high depth-to-width ratio. Which change would most reduce the risk of solidification cracking?

  1. Increase the welding current further
  2. Adjust the parameters to produce a wider, shallower bead shape Correct answer.
  3. Decrease the flux layer thickness
  4. Increase the travel speed to narrow the bead

Explanation

Deep, narrow beads with high depth-to-width ratios concentrate solidification strains at the centerline and promote cracking. Widening the bead and reducing penetration depth redistribute the shrinkage strain. Increasing current or travel speed typically worsens the profile.

Question 19Welding fundamentals and processes

Why must electrodes for low-hydrogen processes be stored in holding ovens after opening?

  1. To make the coating more conductive
  2. To increase the carbon content of the weld metal
  3. To keep the flux dry and prevent moisture pickup that would raise diffusible hydrogen Correct answer.
  4. To reduce the electrode diameter slightly

Explanation

Basic coverings are hygroscopic; absorbed moisture breaks down in the arc and introduces hydrogen into the weld. Holding ovens keep the coating dry so the low-hydrogen classification is maintained in practice. Storage does not change the weld chemistry in the other ways listed.

Question 20Welding fundamentals and processes

A procedure specifies DCEN for GTAW on stainless steel. What is the primary reason for choosing this polarity?

  1. It prevents any chromium carbide precipitation
  2. It provides the strongest oxide cleaning action
  3. It concentrates heat in the workpiece for deeper penetration and protects the tungsten Correct answer.
  4. It allows the use of a smaller shielding gas flow

Explanation

With the electrode negative, most of the arc heat goes into the workpiece, giving good penetration while keeping the tungsten cool enough to avoid melt-back. Oxide cleaning is minimal under DCEN, which is acceptable on clean stainless steel. Polarity choice does not control carbide precipitation.

Question 21Welding fundamentals and processes

In a welding procedure, heat input is calculated as (voltage x current x 60) / (travel speed x 1000). If voltage is 25 V, current is 200 A, and travel speed is 150 mm/min, what is the approximate heat input in kJ/mm?

  1. 0.02 kJ/mm
  2. 0.2 kJ/mm
  3. 20 kJ/mm
  4. 2.0 kJ/mm Correct answer.

Explanation

Substituting gives (25 x 200 x 60) divided by (150 x 1000), which equals 300000 divided by 150000, or 2.0 kJ/mm. Heat input rises with current and voltage and falls as travel speed increases. This value is used to judge whether the procedure stays within qualified limits.

Question 22Welding fundamentals and processes

Why does cellulosic electrode covering produce deep penetration in SMAW?

  1. It forms a thick slag that insulates the arc from the plate
  2. It melts at a lower temperature than the core wire
  3. It generates a large volume of gas and a forceful arc that drives the pool aside Correct answer.
  4. It contains iron powder that increases deposition without affecting penetration

Explanation

Cellulosic coverings decompose to release substantial gas, producing a stiff, forceful arc that pushes molten metal aside and concentrates heat at the root. This gives the characteristic deep penetration used in pipeline root passes. The other options describe unrelated covering behaviors.

Question 23Welding fundamentals and processes

A weld made on quenched and tempered steel shows a hard heat-affected zone and cracks after cooling. Which combination best explains the failure?

  1. Welding in the flat position with a short arc
  2. Excessive heat input and slow cooling
  3. Use of a low-hydrogen electrode with preheat
  4. Insufficient heat input with rapid cooling plus hydrogen and restraint Correct answer.

Explanation

Quenched and tempered steels are sensitive to fast cooling, which forms hard martensite in the heat-affected zone. Combined with diffusible hydrogen and joint restraint, this leads to cold cracking. Adequate preheat and controlled heat input are used to avoid this outcome.

Question 24Welding fundamentals and processes

In FCAW, what is the key difference between self-shielded and gas-shielded flux-cored wires?

  1. Gas-shielded wires produce no slag
  2. Self-shielded wires can only be used with DCEN
  3. Gas-shielded wires contain no flux at all
  4. Self-shielded wires rely on the flux core for shielding and need no external gas Correct answer.

Explanation

Self-shielded flux-cored wires generate their own shielding from the decomposing core, making them suitable for field work in wind. Gas-shielded wires require an external gas supply in addition to the flux core. Both types produce slag and can be used in various positions with appropriate procedures.

Question 25Welding fundamentals and processes

A welder notices porosity concentrated at the start of a GMAW bead. Which cause is most consistent with this pattern?

  1. Too much preheat on the base plate
  2. Excessive travel speed at the end of the bead
  3. Insufficient shielding gas flow at the start or a poorly purged start Correct answer.
  4. A worn contact tip at the end of the run

Explanation

Porosity clustered at the start usually indicates gas coverage was not established, often from a delayed gas preflow, a kinked hose, or a draft. Poor start conditions trap atmospheric gas in the first metal deposited. Mid-bead or end-of-bead porosity would suggest different causes.

Question 26Welding fundamentals and processes

In the AWS classification E7018, what does the '18' indicate about the electrode?

  1. The electrode is usable only in the flat position and has a rutile covering
  2. The electrode is usable in all positions and has a low-hydrogen iron powder covering Correct answer.
  3. The electrode has a minimum tensile strength of 18 ksi
  4. The electrode contains 18 percent chromium for corrosion resistance

Explanation

In the AWS A5.1 system for mild steel covered electrodes, the final two digits give the position capability and the covering/current type. The digit '1' means all-position use, and '8' designates a low-hydrogen, iron-powder covering operated on DC or AC. The '70' portion already states the 70 ksi minimum tensile strength.

Question 27Welding fundamentals and processes

Which arc welding process uses a continuous bare wire electrode and relies entirely on a granular flux layer, with no external shielding gas, to protect the molten weld?

  1. Submerged arc welding Correct answer.
  2. Shielded metal arc welding
  3. Gas tungsten arc welding
  4. Flux-cored arc welding

Explanation

Submerged arc welding feeds a bare wire into an arc that is buried beneath a blanket of granular flux. The flux shields the arc from the atmosphere and generates slag, so no external gas is supplied. This buried arc is why the process produces little visible arc light and low fume.

Question 28Welding fundamentals and processes

What is the primary function of the slag produced by a covered electrode during shielded metal arc welding?

  1. It increases the deposition rate by adding filler metal
  2. It shields the solidifying weld from air and helps shape the bead Correct answer.
  3. It conducts the welding current across the arc gap
  4. It cools the weld rapidly to refine the grain structure

Explanation

Slag forms from the melted covering and floats on the molten pool, where it limits contact with oxygen and nitrogen and slows cooling. It also supports the bead in vertical and overhead positions and can contribute alloying elements. Slag is not an electrical conductor and is removed after the pass.

Question 29Welding fundamentals and processes

Which welding current type is generally preferred for gas tungsten arc welding of aluminum thicker than about 3 mm, and why?

  1. Direct current electrode positive, because it concentrates heat into the workpiece
  2. Direct current electrode negative, because it maximizes penetration depth
  3. Pulsed direct current, because it eliminates the need for filler metal
  4. Alternating current, because the positive half-cycle breaks up the oxide film Correct answer.

Explanation

Aluminum forms a tenacious oxide with a very high melting point, and the electrode-positive half-cycle of alternating current provides the cathodic cleaning action that breaks it down. The electrode-negative half-cycle then limits tungsten overheating while delivering penetration. Balanced AC therefore combines cleaning with adequate melting capacity.

Question 30Welding fundamentals and processes

A welder increases travel speed while holding voltage and current constant. What happens to the heat input per unit length of weld?

  1. Heat input decreases Correct answer.
  2. Heat input first rises, then falls
  3. Heat input increases
  4. Heat input stays the same

Explanation

Heat input is proportional to arc power divided by travel speed, so raising speed spreads the same power over a longer length. The result is less energy deposited per millimetre of weld. Lower heat input generally narrows the heat-affected zone and reduces distortion.

Question 31Welding fundamentals and processes

In gas metal arc welding, what does the term 'wire feed speed' primarily control when voltage is held constant?

  1. The shielding gas flow rate
  2. The arc length
  3. The polarity of the arc
  4. The deposition rate and welding current Correct answer.

Explanation

Wire feed speed sets how much filler passes through the torch per unit time, and on a constant-voltage supply the current rises to match that burn-off rate. Higher wire feed speed therefore increases both current and deposition rate. Arc length is governed mainly by the voltage setting.

Question 32Welding fundamentals and processes

Which characteristic distinguishes a rutile electrode covering from a basic (low-hydrogen) covering?

  1. Basic coverings produce more spatter and a rougher bead surface than rutile types
  2. Basic coverings contain more titanium dioxide and slag more heavily
  3. Rutile coverings give smoother arc stability but deposit higher-hydrogen, lower-toughness weld metal Correct answer.
  4. Rutile coverings always require DC electrode positive and cannot run on AC

Explanation

Rutile coverings are rich in titanium dioxide, which stabilizes the arc and gives a smooth bead with easy slag removal. However, they introduce more hydrogen into the weld and give lower toughness than basic coverings. Basic coverings are calcium-fluoride based and are chosen where low hydrogen and good toughness are required.

Question 33Welding fundamentals and processes

A welder is using the short-circuiting transfer mode on thin sheet and wants to reduce spatter and improve wetting. Which adjustment is most appropriate?

  1. Decrease the inductance setting
  2. Increase the arc voltage sharply
  3. Increase the inductance setting Correct answer.
  4. Switch to direct current electrode positive with a larger diameter wire

Explanation

In short-circuiting transfer, inductance controls how quickly the current rises during the short circuit. Raising inductance slows that rise, softening the pinch-off and reducing spatter while improving wetting. Excess inductance can cause the wire to stub, so the setting must remain within the recommended range.

Question 34Welding fundamentals and processes

Which mode of metal transfer produces the deepest penetration and highest deposition rates for flat-position gas metal arc welding on thick steel?

  1. Globular transfer
  2. Pulsed transfer
  3. Spray transfer Correct answer.
  4. Short-circuiting transfer

Explanation

Spray transfer uses current above the transition level so that fine droplets are projected axially at high velocity. This concentrated, high-current arc gives deep penetration and high deposition, but it is limited to flat and horizontal positions. Short-circuiting and pulsed modes are used where lower heat input is needed.

Question 35Welding fundamentals and processes

Why is the electrode negative polarity normally selected for gas tungsten arc welding of carbon steel?

  1. It stabilizes the arc on alternating current only
  2. It provides a cleaning action that removes surface oxides
  3. It increases the deposition rate of filler metal
  4. It concentrates heat in the workpiece and limits tungsten electrode erosion Correct answer.

Explanation

With the electrode negative, electrons bombard the workpiece, so most of the arc heat enters the joint and only about a third reaches the tungsten. This gives good penetration while allowing a high current without melting the electrode. The cleaning action belongs to the electrode-positive half-cycle instead.

Question 36Welding fundamentals and processes

In flux-cored arc welding, what is the essential difference between self-shielded and gas-shielded wires?

  1. Self-shielded wires require a separate CO2 supply, while gas-shielded wires do not
  2. Self-shielded wires generate their own protective atmosphere from the core ingredients, while gas-shielded wires need an external gas Correct answer.
  3. Self-shielded wires cannot be used outdoors because wind removes their shielding
  4. Gas-shielded wires are only available in the self-shielded configuration

Explanation

Self-shielded flux-cored wires contain ingredients in the core that decompose to form the shielding atmosphere, so no external gas is needed. This makes them more tolerant of wind and suitable for field work. Gas-shielded wires rely on an external supply such as CO2 or an argon blend and require protection from drafts.

Question 37Welding fundamentals and processes

A welder is joining 1.5 mm carbon steel sheet and must avoid burn-through and distortion. Which process and setup is most suitable?

  1. SAW with a large diameter wire and high current
  2. GTAW with direct current electrode negative and low current Correct answer.
  3. SMAW with a 4 mm cellulosic electrode at high current
  4. GMAW in the spray transfer mode at high current

Explanation

Gas tungsten arc welding gives precise, independent control of current and heat input, so it suits thin sheet where burn-through is a risk. Low current with electrode-negative DC keeps the heat input modest and the arc stable. Processes that deposit large amounts of heat per unit length are unsuitable at this thickness.

Question 38Welding fundamentals and processes

A fillet weld made with a cellulosic electrode shows deeper penetration than one made with a rutile electrode at the same current. Which explanation is most consistent with this difference?

  1. Cellulosic coverings contain more iron powder, which adds heat to the pool
  2. Cellulosic coverings generate a forceful gas stream and a more concentrated, penetrating arc Correct answer.
  3. Rutile coverings produce a higher arc voltage that reduces penetration
  4. Cellulosic electrodes operate only on alternating current, which penetrates more deeply

Explanation

Cellulosic coverings decompose to release large volumes of gas, producing a stiff, forceful arc that drives heat into the root. This is why cellulosic electrodes are favored for pipeline root passes. Rutile coverings give a softer, more diffuse arc and shallower penetration at the same current.

Question 39Welding fundamentals and processes

A fabricator must weld a thick quenched and tempered steel and wants to avoid a hard, crack-prone heat-affected zone. Which combination of measures is most appropriate?

  1. Use rutile electrodes and weld at maximum current without preheat
  2. Use cellulosic electrodes and increase cooling rate with compressed air
  3. Use low-hydrogen consumables, apply preheat, and control interpass temperature Correct answer.
  4. Use high heat input, skip preheating, and allow rapid air cooling

Explanation

Hardening in the heat-affected zone is driven by fast cooling and by hydrogen from moisture-bearing consumables. Low-hydrogen consumables limit hydrogen, preheat slows the cooling rate through the hardening range, and interpass limits prevent excessive heat input from degrading the tempered base metal. Together these measures reduce cold-cracking risk.

Question 40Welding fundamentals and processes

A welder observes that porosity in a gas metal arc weld is concentrated at the start of each bead and disappears along the rest of the run. Which cause best explains this pattern?

  1. Contamination of the base metal along the entire joint length
  2. Excessive travel speed along the whole bead
  3. Gas flow that has not stabilized at the start, or a start made before the gas pre-flow is complete Correct answer.
  4. Wire feed speed set too high for the wire diameter

Explanation

At the start of a run, gas delivery may not yet have purged the torch and nozzle, so air can be drawn into the first centimetres of the weld. A short gas pre-flow before striking the arc, and a run-off rather than an abrupt stop, eliminates this localized porosity. Porosity that appears only at starts points to shielding rather than to the whole joint.

Question 41Codes, standards and specifications

Under CSA W47.1, which party is responsible for certifying that a fabricator's quality control system meets the requirements of the standard?

  1. The Canadian Welding Bureau Correct answer.
  2. The project engineer of record
  3. The fabricator's own QC manager
  4. The welding consumable supplier

Explanation

CSA W47.1 certification is administered by the Canadian Welding Bureau, which audits and certifies fabricators' welding quality control programs. The certification is issued to the company and covers the scope of work described in its quality manual. Neither the engineer of record nor internal staff can grant certification under this standard.

Question 42Codes, standards and specifications

In CSA W59, what does the term 'welding procedure specification' primarily document?

  1. The welder's personal qualification test results
  2. The inspection acceptance criteria for a project
  3. The chemical composition of the base metal heat
  4. The variables and parameters used to make a production weld Correct answer.

Explanation

A welding procedure specification records the essential and non-essential variables and parameters that govern how a weld is made. It is a controlled document that production welding must follow. It is not a record of individual welder performance or a substitute for inspection criteria.

Question 43Codes, standards and specifications

A fabricator wants to weld using a procedure that differs from a previously qualified WPS by changing only a non-essential variable. What action is required under CSA W59?

  1. Revise the WPS without requalification Correct answer.
  2. Obtain engineer approval with no documentation
  3. Submit a new welder performance test
  4. Require full requalification by testing

Explanation

Changes to non-essential variables do not affect the mechanical properties of the weld and therefore do not require requalification. The WPS is simply revised to reflect the new conditions. Requalification is triggered only by changes to essential or supplementary essential variables.

Question 44Codes, standards and specifications

Which document typically takes precedence when a project specification conflicts with a referenced welding code?

  1. The welding consumable data sheet governs
  2. The project specification governs Correct answer.
  3. The referenced welding code always governs
  4. The fabricator chooses the stricter document

Explanation

Project specifications are contract documents prepared for the specific work and generally take precedence over general referenced standards. A common contract hierarchy places the specification above the code unless the specification states otherwise. Fabricators cannot unilaterally decide precedence.

Question 45Codes, standards and specifications

Under AWS D1.1, which of the following is classified as an essential variable for procedure qualification?

  1. Travel speed within the qualified range
  2. Preheat maintained above the minimum
  3. Change from single pass to multiple pass per side Correct answer.
  4. Electrode brand within the same classification

Explanation

A change from single pass to multiple pass per side affects heat input and toughness and is treated as an essential variable requiring requalification. Travel speed and preheat variations within qualified limits are non-essential. Electrode brand changes within the same classification are generally non-essential.

Question 46Codes, standards and specifications

What is the primary purpose of a welding procedure qualification test under CSA W59?

  1. To confirm the base metal mill certificate
  2. To demonstrate the welder's manual skill
  3. To verify that the procedure produces sound welds with acceptable mechanical properties Correct answer.
  4. To establish the purchase price of consumables

Explanation

Procedure qualification confirms that the welding procedure, when followed, produces welds meeting the required mechanical and soundness criteria. It is distinct from welder performance qualification, which tests the individual. Together they provide the basis for production welding quality.

Question 47Codes, standards and specifications

A welder qualified under CSA W47.1 in the flat position wishes to weld in the vertical-up position on the same joint type and process. What is the general requirement?

  1. The welder must requalify in the new position Correct answer.
  2. The engineer may waive qualification
  3. Only a visual inspection is required
  4. No additional qualification is required

Explanation

Welder qualification is position-specific; a welder qualified only in flat position is not qualified to weld in vertical-up. Additional testing in the new position is required. Position is a fundamental variable in welder performance qualification.

Question 48Codes, standards and specifications

In AWS D1.1, what is the minimum length of a welder performance qualification test coupon for a plate groove weld?

  1. 100 mm
  2. 150 mm
  3. 200 mm Correct answer.
  4. 250 mm

Explanation

AWS D1.1 specifies a minimum test coupon length of 200 mm for plate groove welds used in performance qualification. This length provides sufficient material for the required bend specimens. Shorter coupons would not yield adequate test specimens.

Question 49Codes, standards and specifications

Which organization publishes the ASME Boiler and Pressure Vessel Code Section IX?

  1. American Society of Mechanical Engineers Correct answer.
  2. Canadian Standards Association
  3. American Petroleum Institute
  4. American Welding Society

Explanation

ASME Section IX, Welding, Brazing, and Fusing Qualifications, is published by the American Society of Mechanical Engineers. It establishes qualification requirements for procedures and personnel in pressure equipment. It is commonly referenced alongside other ASME construction sections.

Question 50Codes, standards and specifications

Under ASME Section IX, a welder who qualified using the SMAW process wishes to weld using GTAW. What is required?

  1. Approval by the QC manager
  2. Only a change to the WPS
  3. No additional qualification
  4. Qualification in the GTAW process Correct answer.

Explanation

Process is an essential variable in welder performance qualification, so a welder qualified in one process is not qualified in another. Separate qualification testing is required for GTAW. Procedure changes alone cannot extend a welder's qualification to a new process.