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Canada BWR practice questions

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Question 1Welding Processes and Variables

In the SMAW process, what is the primary function of the electrode coating (flux) during welding?

  1. It cools the weld pool rapidly to refine the grain structure
  2. It conducts the welding current more efficiently than the core wire
  3. It acts as a permanent backing that remains part of the joint
  4. It generates shielding gas and forms a protective slag over the weld Correct answer.

Explanation

The covering on a covered electrode decomposes in the arc to release shielding gases and produce a slag layer that protects the solidifying weld metal from atmospheric contamination. It also stabilizes the arc and can add alloying elements. Its role is chemical and atmospheric protection, not current conduction or cooling.

Question 2Welding Processes and Variables

Which polarity designation describes an SMAW setup where the electrode holder is connected to the positive terminal and the workpiece to the negative terminal?

  1. Direct current straight polarity (DCSP)
  2. Direct current electrode negative (DCEN)
  3. Alternating current (AC)
  4. Direct current electrode positive (DCEP) Correct answer.

Explanation

When the electrode is connected to the positive terminal, the circuit is described as direct current electrode positive, also called reverse polarity. DCEN, or straight polarity, places the electrode on the negative terminal. AC alternates and therefore has no fixed electrode polarity.

Question 3Welding Processes and Variables

What does the '1G' position designation indicate for a groove weld on pipe?

  1. The pipe axis is horizontal and the pipe is rotated under the arc Correct answer.
  2. The pipe axis is horizontal and fixed, welded from the side
  3. The pipe axis is inclined at 45 degrees and fixed
  4. The pipe axis is vertical and fixed, welded upward

Explanation

In the 1G position the pipe is turned so that welding occurs at the flat, top position while the pipe rotates beneath the arc. The number 1 denotes the flat position and G denotes a groove weld. Fixed horizontal pipe welded from the side is 5G, and fixed vertical pipe is 6G.

Question 4Welding Processes and Variables

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

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

Explanation

Argon-rich mixtures with carbon dioxide, typically 75 to 90 percent argon, are standard for short-circuiting transfer on carbon steel because they provide stable arc behavior and good bead shape. Pure helium is used mainly for high-heat applications such as aluminum or stainless. Oxygen and nitrogen in pure form are not used as primary shielding gases for this purpose.

Question 5Welding Processes and Variables

In gas tungsten arc welding, what is the main purpose of the filler metal being added separately from the arc?

  1. To supply the deposited metal while the arc primarily provides heat and shielding Correct answer.
  2. To stabilize the alternating current waveform
  3. To generate the shielding gas at the arc
  4. To cool the tungsten electrode during welding

Explanation

GTAW uses a non-consumable tungsten electrode, so any filler metal needed to build the joint must be added independently, usually by hand or wire feeder. The arc supplies heat and the shielding gas protects the pool. The filler does not stabilize current, cool the electrode, or generate gas.

Question 6Welding Processes and Variables

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

  1. To eliminate the need for shielding gas
  2. To increase the travel speed beyond the machine limit
  3. To increase the arc voltage automatically
  4. To slow the cooling rate and reduce the risk of hydrogen cracking Correct answer.

Explanation

Preheating raises the base metal temperature so heat dissipates more slowly after welding, which reduces the formation of hard martensite and allows hydrogen to escape. This lowers cracking risk in thick or restrained joints. Preheating does not change voltage settings, replace shielding, or set travel speed.

Question 7Welding Processes and Variables

Which welding process uses a continuous wire electrode and a granular flux that is deposited ahead of the arc and becomes a molten slag?

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

Explanation

Submerged arc welding feeds a continuous bare wire into a blanket of granular flux that covers the arc completely. The flux melts to form a slag that shields the weld and can be recovered and reused. SMAW uses a coated stick, GTAW uses a tungsten electrode, and oxyfuel welding uses a gas flame with no flux blanket.

Question 8Welding Processes and Variables

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

  1. The time required to cool the weld between passes
  2. The fraction of the electrode that is consumed as filler
  3. The percentage of a ten-minute period that the machine can operate at a given output without overheating Correct answer.
  4. The ratio of arc voltage to welding current

Explanation

Duty cycle is expressed as a percentage of a ten-minute base period during which the power source can deliver a rated current continuously without exceeding its thermal limit. A 60 percent duty cycle at 200 amps means 6 minutes of welding followed by 4 minutes of cooling. It is a thermal rating, not a voltage-current ratio or interpass timing.

Question 9Welding Processes and Variables

A welder increases welding current while holding all other variables constant. What is the most likely effect on the weld bead?

  1. Decreased penetration and a narrower bead
  2. Reduced deposition rate and slower melting
  3. No change in penetration but a taller reinforcement
  4. Increased penetration and a wider bead Correct answer.

Explanation

Higher current increases heat input and electrode melting rate, which generally deepens penetration and widens the bead. Deposition rate also rises. The other options describe effects opposite to the expected outcome of increased current.

Question 10Welding Processes and Variables

Why is direct current electrode negative commonly preferred for GTAW on thin aluminum using a conventional transformer machine?

  1. It concentrates more heat in the workpiece and reduces tungsten overheating Correct answer.
  2. It produces a wider heat-affected zone than AC
  3. It provides the cleaning action needed to remove the oxide layer
  4. It eliminates the need for any shielding gas

Explanation

With DCEN the electrons flow from the workpiece to the electrode, so most of the heat is deposited in the work while the tungsten stays cooler. This allows deeper penetration and less risk of melting the electrode. However, DCEN lacks the oxide cleaning action that AC provides, which is why AC is often used on aluminum.

Question 11Welding Processes and Variables

A welder is using the spray transfer mode in GMAW. Which condition is required to achieve it?

  1. Low current below the globular transition level
  2. A short arc length with frequent short circuits
  3. Sufficiently high current above the transition level with an argon-rich gas Correct answer.
  4. Pure carbon dioxide shielding gas

Explanation

Spray transfer requires current above a transition level that depends on wire diameter and shielding gas, and it is achieved with argon-rich mixtures. Metal transfers as fine droplets axially across the arc. Low current produces short-circuiting or globular transfer, and pure CO2 does not support a true spray mode.

Question 12Welding Processes and Variables

What is the main consequence of using too long an arc length in SMAW?

  1. Deeper penetration and a narrower bead
  2. Increased spatter and reduced penetration with a wider, flatter bead Correct answer.
  3. Automatic reduction of welding current by the power source
  4. Increased deposition efficiency with no change in arc stability

Explanation

A long arc raises arc voltage, spreads the arc over a larger area, and reduces penetration while increasing spatter and flattening the bead. It can also cause arc instability and greater atmospheric exposure. A short arc concentrates heat and improves penetration and control.

Question 13Welding Processes and Variables

Which variable most directly controls the amount of base metal melted and the depth of penetration in a given welding process?

  1. Shielding gas flow rate
  2. Welding current Correct answer.
  3. Interpass cleaning method
  4. Electrode extension beyond the nozzle in GTAW

Explanation

Welding current determines the heat generated at the arc and therefore the melting of base metal and filler, making it the primary control of penetration and deposition. Gas flow rate affects shielding quality, electrode extension affects resistive heating in GMAW, and cleaning affects quality but not penetration depth.

Question 14Welding Processes and Variables

In the FCAW process, what distinguishes a self-shielded flux-cored wire from a gas-shielded one?

  1. The self-shielded wire contains ingredients that generate shielding gas without an external supply Correct answer.
  2. The self-shielded wire operates only with alternating current
  3. The self-shielded wire requires a higher argon flow than the gas-shielded type
  4. The self-shielded wire uses a tungsten electrode instead of a consumable wire

Explanation

Self-shielded flux-cored wires contain fluxing and gas-generating compounds within the core so that no external shielding gas is needed, which is useful in windy field conditions. Gas-shielded flux-cored wires require an external gas supply such as CO2 or an argon mix. Neither type uses a tungsten electrode, and both can run on DC.

Question 15Welding Processes and Variables

What is the purpose of weaving the electrode during a weld pass?

  1. To reduce heat input below the minimum required for fusion
  2. To increase the arc voltage beyond the power source setting
  3. To spread the bead over a wider area and improve fusion at the joint sidewalls Correct answer.
  4. To eliminate the need for proper joint preparation

Explanation

A controlled weave moves the arc across the joint so the bead covers a wider width and wets into the sidewalls, improving fusion on wide grooves. The weave must be controlled to avoid excessive heat input or slag entrapment. It does not replace joint preparation or change the set voltage.

Question 16Welding Processes and Variables

Which type of joint preparation is most likely to require back gouging or a backing to achieve full penetration?

  1. A T-joint welded with fillets on both sides
  2. A square butt joint on thin sheet
  3. A lap joint with two fillet welds
  4. A single-V groove welded from one side Correct answer.

Explanation

A single-V groove welded only from one side may leave incomplete fusion or slag at the root, so back gouging and welding from the second side, or a backing, is used to ensure full penetration. Square butt joints on thin sheet can often be welded through, and fillet welds on lap and T-joints do not require through-thickness penetration.

Question 17Welding Processes and Variables

A welder observes porosity concentrated at the start of a GMAW bead. Which cause is most plausible?

  1. Excessive travel speed throughout the pass
  2. Insufficient gas coverage during arc initiation Correct answer.
  3. A short electrode extension
  4. Too high a shielding gas flow at mid-pass

Explanation

At arc start, gas flow may not have stabilized or the nozzle may be too far from the work, allowing air to enter the pool and create porosity. Excessive travel speed tends to cause undercut or a narrow bead rather than localized start porosity. A short electrode extension improves shielding, not worsens it.

Question 18Welding Processes and Variables

Which welding variable is adjusted to change the arc voltage in GMAW while keeping the wire feed speed constant?

  1. The work lead cable length
  2. The electrode wire diameter
  3. The voltage setting on the power source, which changes arc length Correct answer.
  4. The shielding gas cylinder pressure

Explanation

In GMAW the voltage setting controls arc length, and the power source maintains the relationship between voltage and wire feed speed. Adjusting voltage changes arc length and bead shape. Cylinder pressure, cable length, and wire diameter are not used as running voltage controls.

Question 19Welding Processes and Variables

What is the effect of increasing travel speed beyond the proper range while keeping current and voltage constant?

  1. Deposition rate increases proportionally with no change in bead shape
  2. The bead becomes wider and penetration increases
  3. The bead becomes narrower and penetration may decrease, with a risk of undercut Correct answer.
  4. The shielding gas requirement is eliminated

Explanation

Higher travel speed reduces heat input per unit length, producing a narrower, thinner bead and potentially less penetration. If speed is too high, the arc may not fill the joint edges, causing undercut. Deposition rate is set mainly by current and wire feed speed, not travel speed.

Question 20Welding Processes and Variables

In a welding procedure, what does the term 'heat input' quantify?

  1. The temperature of the base metal before welding
  2. The energy delivered per unit length of weld, usually expressed in kilojoules per millimeter Correct answer.
  3. The cooling rate of the weld after solidification
  4. The total energy consumed by the machine over a shift

Explanation

Heat input is calculated from arc voltage, current, and travel speed, giving energy per unit length of weld such as kJ/mm. It strongly influences cooling rate, microstructure, and the size of the heat-affected zone. It is not a measure of total energy consumption, preheat temperature, or cooling rate itself.

Question 21Welding Processes and Variables

Why do cellulosic electrodes used in pipeline root passes require a different technique than rutile electrodes?

  1. They produce a forceful, deep-penetrating arc with a thin slag that suits vertical-down root welding Correct answer.
  2. They operate only on alternating current with no arc force
  3. They deposit metal without any shielding gas generation
  4. They generate a thick, quick-freezing slag that requires vertical-up welding only

Explanation

Cellulosic coverings decompose to give a high-hydrogen, forceful arc that drives deep into the root and produces a thin, easily removed slag, making vertical-down root passes practical. Rutile electrodes give a smoother arc with a thicker slag and are typically used differently. Cellulosic electrodes do generate shielding gas and are not limited to AC.

Question 22Welding Processes and Variables

A procedure requires limiting heat input on quenched and tempered steel. Which combination best reduces heat input per unit length?

  1. Lower current, higher travel speed, and a shorter arc within acceptable limits Correct answer.
  2. Higher voltage and slower travel speed
  3. Increased preheat and slower cooling
  4. Higher current, lower travel speed, and a longer arc

Explanation

Heat input is proportional to voltage and current and inversely proportional to travel speed, so reducing current and increasing travel speed lowers it. A shorter arc also lowers voltage within practical limits. Higher current, slower travel, or higher voltage all raise heat input, and increased preheat affects cooling independently.

Question 23Welding Processes and Variables

In pulsed GMAW, what is the role of the background current between pulses?

  1. It maintains the arc without transferring large droplets, allowing lower average heat input Correct answer.
  2. It provides the cleaning action for aluminum oxide
  3. It forces a short circuit to detach each droplet
  4. It sets the shielding gas flow rate

Explanation

Pulsed GMAW alternates between a high peak current that detaches a droplet and a lower background current that keeps the arc stable without transferring large globules. This lowers average current and heat input while maintaining spray-like transfer at low average currents. It does not create short circuits, clean oxide, or control gas flow.

Question 24Welding Processes and Variables

Why can excessive electrode extension in GMAW cause a change in deposition behavior even at constant wire feed speed?

  1. The wire feed motor slows down to compensate for the longer path
  2. The shielding gas becomes ionized and increases arc voltage automatically
  3. Resistance heating over the longer extension preheats the wire, so it melts faster and the arc length changes Correct answer.
  4. The contact tip temperature drops and reduces current

Explanation

Extending the wire beyond the nozzle increases the length of wire carrying current, so I-squared-R heating preheats the wire before it reaches the arc. This raises the melting rate and shifts the balance with wire feed speed, altering arc length and penetration. The power source does not automatically compensate, and the motor speed is unchanged.

Question 25Welding Processes and Variables

A weld on thick aluminum is made with AC GTAW. Why is a balance control between electrode-positive and electrode-negative portions useful?

  1. It reverses the direction of the filler wire feed
  2. It changes the shielding gas composition during the weld
  3. It converts the process from AC to DC permanently
  4. It trades oxide cleaning against tungsten heating and penetration depth Correct answer.

Explanation

On aluminum the electrode-positive portion provides oxide cleaning but heats the tungsten, while the electrode-negative portion gives penetration and protects the electrode. Adjusting the balance lets the welder favor cleaning or penetration and control tungsten erosion. It does not alter gas composition, filler direction, or permanently change the current type.

Question 26Welding Processes and Variables

In SMAW, what does the electrode classification number E7018 primarily indicate about the electrode's capabilities?

  1. The maximum welding current the electrode can carry before overheating
  2. The minimum tensile strength, welding position, coating type, and current type Correct answer.
  3. The deposition efficiency and slag removal difficulty of the electrode
  4. The diameter tolerance and packaging quantity of the electrode

Explanation

The E designates an arc welding electrode, and the first two digits give the minimum tensile strength in ksi. The third digit indicates the welding positions permitted, and the final digits encode the coating and current requirements. Together these tell the welder the mechanical and operational class of the electrode.

Question 27Welding Processes and Variables

Which shielding gas is most commonly used for the short-circuiting transfer mode in GMAW of carbon steel?

  1. Pure argon
  2. Pure helium
  3. An argon-helium blend
  4. Pure carbon dioxide or a carbon dioxide-rich mixture Correct answer.

Explanation

Short-circuiting transfer requires a gas that promotes a low-energy, controlled pinch-off of the molten bridge. Carbon dioxide or carbon dioxide-rich mixtures provide this behavior and are economical for carbon steel. Argon-rich gases tend to promote spray transfer at higher currents instead.

Question 28Welding Processes and Variables

What is the primary function of the nozzle in GTAW?

  1. To conduct the welding current to the workpiece
  2. To feed filler metal into the weld pool
  3. To stabilize the arc by ionizing the gas
  4. To deliver and direct the shielding gas around the arc and pool Correct answer.

Explanation

The GTAW torch nozzle shapes and directs the inert shielding gas so it blankets the electrode tip and the molten pool. Proper gas coverage prevents atmospheric contamination. The nozzle carries no current and does not feed filler.

Question 29Welding Processes and Variables

Which SAW variable is most directly adjusted to change the weld bead width while keeping current and travel speed constant?

  1. Wire feed speed
  2. Arc voltage Correct answer.
  3. Flux particle size
  4. Electrode polarity

Explanation

In submerged arc welding, arc voltage governs arc length, and a longer arc spreads the arc over a wider area. Increasing voltage therefore widens the bead and flattens its profile. Current and travel speed mainly affect penetration and bead height.

Question 30Welding Processes and Variables

A welder switches from DC electrode positive to DC electrode negative in GMAW on steel. What is the expected result?

  1. Higher deposition rate with poorer arc stability and penetration Correct answer.
  2. No change in behavior because polarity does not affect GMAW
  3. Deeper penetration and a stable spray transfer
  4. Stronger arc cleaning action on the plate surface

Explanation

DC electrode negative puts more heat into the electrode and less into the workpiece. Deposition rate rises, but penetration decreases and the arc becomes less stable for most GMAW wires. DC electrode positive is the standard choice for steel because it concentrates heat in the work.

Question 31Welding Processes and Variables

A welder must reduce spatter when making a vertical-up root pass with FCAW. Which practice best addresses this?

  1. Increasing travel speed to the fastest possible rate
  2. Switching to a long arc and increasing voltage
  3. Using a slight drag angle and a short arc length Correct answer.
  4. Increasing wire feed speed to the maximum available

Explanation

A short arc length with a slight drag angle keeps the molten metal under control and reduces spatter in the vertical-up position. Excessive voltage lengthens the arc and increases spatter. Wire feed speed and travel speed must stay within the range that maintains proper fusion.

Question 32Welding Processes and Variables

What is the main effect of increasing the electrode extension beyond the recommended range in SAW?

  1. No measurable effect on the weld
  2. Increased penetration due to resistive heating
  3. Reduced deposition rate and a risk of incomplete fusion Correct answer.
  4. Increased arc voltage for the same current setting

Explanation

A longer electrode extension increases resistive heating of the wire, which raises the burn-off rate for a given current. To hold the current setting, wire feed speed must fall, reducing deposition. The cooler, less penetrating arc also raises the risk of incomplete fusion.

Question 33Welding Processes and Variables

Why is alternating current often 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 allows a balance between cleaning action and penetration Correct answer.
  4. It provides deeper penetration than DC electrode negative

Explanation

Aluminum forms a tenacious oxide that must be broken up during welding. The electrode-positive half-cycle provides cathodic cleaning, while the electrode-negative half-cycle provides penetration and cools the tungsten. AC lets the welder balance these two effects.

Question 34Welding Processes and Variables

Which condition most favors achieving a stable spray transfer in GMAW on steel?

  1. Short electrode extension with pure helium
  2. Low current with a carbon dioxide-rich gas
  3. Current above the transition value with a high-argon gas Correct answer.
  4. High travel speed with a short arc

Explanation

Spray transfer requires sufficient current to detach fine droplets axially, and a high-argon shielding gas supports the stable axial spray. Below the transition current the transfer becomes globular. Carbon dioxide-rich gases generally prevent a true spray mode.

Question 35Welding Processes and Variables

In a welding procedure, what does the term 'travel speed' directly influence when current and voltage are held constant?

  1. The shielding gas flow rate required
  2. The polarity of the welding current
  3. The electrode classification required
  4. The bead size, penetration, and heat input per unit length Correct answer.

Explanation

Travel speed determines how long the arc deposits heat and metal per unit length of joint. Faster travel reduces heat input per unit length and produces a smaller, narrower bead, while slower travel increases heat input and bead size. It does not change gas flow or polarity requirements.

Question 36Welding Processes and Variables

A welder notices undercut along the edges of a GMAW bead on thin plate. Which combination of variables is the most likely cause?

  1. Insufficient current with slow travel speed
  2. Excessive current with excessive travel speed Correct answer.
  3. High shielding gas flow with a short arc
  4. Short electrode extension with low voltage

Explanation

Undercut occurs when the arc melts the base metal edges faster than molten metal can fill them. Excessive current combined with excessive travel speed produces this condition, especially on thin plate. Reducing current or travel speed allows the pool to fill the gouged edges.

Question 37Welding Processes and Variables

What is the purpose of a backing bar or backing ring in a full-penetration groove weld?

  1. To reduce the amount of filler metal required
  2. To increase the cooling rate of the weld metal
  3. To change the polarity of the welding current
  4. To support the molten pool and help shape the root bead Correct answer.

Explanation

A backing bar or ring supports the molten root so it does not sag or fall through the joint. It also helps form a sound, uniform root bead. The backing may be permanent or removable depending on the application.

Question 38Welding Processes and Variables

Why is a slight drag angle often recommended for FCAW in the flat position?

  1. It directs the shielding gas and molten metal to protect the pool Correct answer.
  2. It reduces the need for a shielding gas
  3. It increases the arc length and voltage
  4. It improves visibility of the arc

Explanation

A slight drag angle points the gas stream and the molten metal back over the pool, improving coverage and helping the weld metal fill the joint. It also gives better control of slag. Pushing too steeply can expose the pool to atmosphere and cause porosity.

Question 39Welding Processes and Variables

A procedure limits heat input on quenched and tempered steel. Which change most effectively reduces heat input per unit length while keeping the joint filled?

  1. Increasing voltage and increasing travel speed
  2. Decreasing voltage and decreasing travel speed
  3. Decreasing current and increasing travel speed Correct answer.
  4. Increasing current and decreasing travel speed

Explanation

Heat input per unit length is proportional to voltage times current divided by travel speed. Lowering current and raising travel speed reduces the energy deposited per millimetre. This helps avoid softening the heat-affected zone of quenched and tempered steel.

Question 40Welding Processes and Variables

In pulsed GMAW, what is the main role of the background current between pulses?

  1. To reverse the polarity of the arc
  2. To maintain the arc and cool the wire between droplet detachments Correct answer.
  3. To increase the shielding gas flow rate
  4. To provide the peak energy for droplet detachment

Explanation

Pulsed GMAW alternates a high peak current that detaches a droplet with a low background current. The background current keeps the arc established and allows the wire and pool to cool between pulses. This lowers average heat input while maintaining a stable spray-like transfer.

Question 41Procedure Qualification (WPS/PQR)

Under ASME Section IX, which document establishes the welding procedure variables and is qualified by a procedure qualification record?

  1. Manufacturer's data report
  2. Procedure qualification record
  3. Welder performance certificate
  4. Welding procedure specification Correct answer.

Explanation

The welding procedure specification (WPS) is the written document that lists the essential, supplementary essential, and nonessential variables used in production welding. It becomes a qualified WPS only after it is supported by a procedure qualification record demonstrating that a test coupon made to those variables passed the required mechanical tests.

Question 42Procedure Qualification (WPS/PQR)

Who is permitted to sign the procedure qualification record for a Canadian BWR fabrication shop?

  1. The welding inspector who witnessed the test
  2. The shop's authorized representative responsible for welding Correct answer.
  3. The independent third-party inspector
  4. The welder who deposited the test coupon

Explanation

Section IX requires the PQR to be certified as accurate by the manufacturer or contractor, meaning an authorized representative of the organization that performed the qualification. The certifying signature attests that the record accurately reflects the variables and test results obtained.

Question 43Procedure Qualification (WPS/PQR)

A WPS is being written for shielded metal arc welding of carbon steel pipe. Which of the following is classified as an essential variable for procedure qualification?

  1. Joint design details
  2. Welding position progression
  3. Base metal thickness range qualified Correct answer.
  4. Electrode diameter

Explanation

Base metal thickness is an essential variable because it governs the range of production thicknesses the qualification supports and affects heat input and cooling rate. Changing to a thickness outside the qualified range requires requalification.

Question 44Procedure Qualification (WPS/PQR)

Which mechanical test is required on a procedure qualification coupon to demonstrate joint tensile strength for a groove weld?

  1. Reduced-section tensile test Correct answer.
  2. Macro etch
  3. Face bend
  4. Charpy V-notch impact test

Explanation

The reduced-section tensile test is used to confirm that the welded joint achieves the required tensile strength specified for the base metal. The specimen is pulled to failure and the measured strength must meet or exceed the minimum specified tensile strength of the base metal.

Question 45Procedure Qualification (WPS/PQR)

For welder performance qualification, which variable is essential and would require requalification if changed?

  1. Change from vertical uphill to flat position Correct answer.
  2. Change in electrode diameter
  3. Change in preheat temperature
  4. Change from one brand of electrode to another within the same classification

Explanation

Welding position, including progression for vertical welding, is an essential variable for welder performance qualification because it changes the skill demands and deposition control. A welder qualified in the flat position is not qualified to weld vertical uphill without additional testing.

Question 46Procedure Qualification (WPS/PQR)

What is the purpose of the supplementary essential variables in ASME Section IX?

  1. They replace the essential variables for pipe welding
  2. They must be addressed whenever notch toughness requirements apply Correct answer.
  3. They apply only to welder performance qualification
  4. They apply only to nonferrous base metals

Explanation

Supplementary essential variables become mandatory when the applicable construction code imposes notch toughness requirements on the weld. They address factors such as heat input, filler metal classification, and preheat that influence toughness of the completed joint.

Question 47Procedure Qualification (WPS/PQR)

A PQR documents a test coupon welded with a single-pass-per-side technique. For which production condition does this qualification typically NOT support the procedure?

  1. Welding with the same process and filler classification
  2. Welding with multiple passes per side where toughness is required Correct answer.
  3. Welding in the qualified position
  4. Welding base metal within the qualified thickness range

Explanation

When notch toughness is a requirement, the number of passes per side is a supplementary essential variable, and a single-pass-per-side coupon does not qualify multiple-pass-per-side production welding. Without toughness requirements, passes per side is generally nonessential.

Question 48Procedure Qualification (WPS/PQR)

Which organization's authorization is normally required before a Canadian nuclear fabrication shop may weld on a BWR pressure boundary component?

  1. The Canadian Welding Bureau only
  2. The filler metal manufacturer
  3. The provincial labour ministry only
  4. The authority having jurisdiction and the applicable nuclear code stamp authorization Correct answer.

Explanation

Nuclear pressure boundary welding requires authorization from the authority having jurisdiction and the applicable code stamp holder, such as the appropriate nuclear quality program. The welding procedures and personnel must be qualified under a documented quality program accepted by that authority.

Question 49Procedure Qualification (WPS/PQR)

A procedure qualification coupon is 10 mm thick and is qualified without impact testing. What production base metal thickness range does this coupon typically support under ASME Section IX groove weld rules?

  1. 10 mm to 20 mm
  2. 3 mm to 10 mm
  3. 1.5 mm to 20 mm Correct answer.
  4. 1.5 mm to 10 mm

Explanation

For a groove weld test coupon without impact testing, the qualified thickness range is typically 1.5 mm minimum up to twice the coupon thickness, so a 10 mm coupon supports production thickness from 1.5 mm to 20 mm. This rule reflects the reduced risk of incomplete fusion in thinner sections and the need to limit upper thickness without toughness data.

Question 50Procedure Qualification (WPS/PQR)

A welder qualified on pipe in the 6G position using SMAW is assigned to weld plate in the flat position with the same process. Which statement is correct?

  1. The welder must requalify because the electrode classification differs
  2. The welder must requalify because plate and pipe are different product forms
  3. The welder is qualified only if impact testing is performed
  4. The welder is qualified because 6G covers all positions and the plate thickness is within range Correct answer.

Explanation

A welder qualified in the 6G pipe position has demonstrated the most restrictive position and is qualified for all positions on both pipe and plate, provided thickness and other essential variables remain within the qualified ranges. Product form change alone does not require requalification.