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I-CAR SWQT practice questions

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Question 1Collision Repair Welding Safety and Shop Practices

Before beginning any GMAW (MIG) welding on a vehicle, which fire-prevention step is required in a collision repair bay?

  1. Disconnect the vehicle battery charger and leave cables attached
  2. Open all bay doors to increase oxygen around the arc
  3. Wet down the floor beneath the work area with water
  4. Move combustible materials at least 35 feet away or protect them with welding blankets Correct answer.

Explanation

The standard hot-work rule is to clear combustibles at least 35 feet from the arc or shield them with fire-resistant covers, because sparks and slag travel well beyond the visible weld. Keeping a charged extinguisher and a fire watch nearby completes the requirement.

Question 2Collision Repair Welding Safety and Shop Practices

A technician must weld on a steel body panel near the fuel filler neck. What is the correct safety practice?

  1. Place a wet rag over the filler neck and proceed
  2. Loosen the fuel cap so pressure can escape during welding
  3. Remove the fuel tank or shield it and confirm no fuel vapor is present before welding Correct answer.
  4. Weld at reduced amperage to limit heat near the tank

Explanation

Fuel vapor is the primary explosion risk in collision welding, so the tank must be removed or effectively isolated and the area confirmed free of vapor before any arc is struck. Reducing amperage or loosening the cap does not eliminate the vapor source.

Question 3Collision Repair Welding Safety and Shop Practices

Which PPE is specifically required to protect the eyes and face during MIG welding on a vehicle?

  1. Clear safety glasses alone
  2. A welding helmet with the correct shade lens for the process and amperage Correct answer.
  3. Sunglasses with UV-rated lenses
  4. A face shield intended for grinding

Explanation

Arc welding emits intense ultraviolet and infrared radiation that can cause arc flash and retinal injury, so a welding helmet with a filter shade matched to the process and current is required. Safety glasses are worn underneath but are not sufficient alone.

Question 4Collision Repair Welding Safety and Shop Practices

Why must a vehicle's electronic control modules and battery be disconnected per OEM procedure before electric welding?

  1. To speed up the welding process by reducing electrical load
  2. To prevent welding current from damaging sensitive electronics through the body ground path Correct answer.
  3. To allow the welder to use a higher duty cycle
  4. To disable the airbag warning lamp during repairs

Explanation

Welding current seeks ground paths through the body, and sensitive modules can be damaged if that current passes through them. OEM procedures specify battery disconnection and sometimes module isolation to protect electronics.

Question 5Collision Repair Welding Safety and Shop Practices

What is the primary purpose of a fume extraction system or proper ventilation during collision welding?

  1. To remove metal fumes and shielding-gas byproducts from the technician's breathing zone Correct answer.
  2. To reduce the welder's input current
  3. To cool the weld faster for better penetration
  4. To prevent the shielding gas cylinder from overheating

Explanation

Welding produces metal fume and ozone that can cause respiratory illness, so extraction or ventilation must keep contaminants out of the breathing zone. Cooling the weld or altering current is not the function of ventilation.

Question 6Collision Repair Welding Safety and Shop Practices

A technician is using a compressed shielding-gas cylinder. Which handling practice is correct?

  1. Lay the cylinder flat on the floor to prevent tipping
  2. Store the cylinder near the welding arc to shorten hose runs
  3. Secure the cylinder upright with a chain or strap and keep the cap on when not in use Correct answer.
  4. Remove the regulator and leave the valve open between jobs

Explanation

Compressed-gas cylinders must be secured upright to prevent falling, and the protective cap should be in place whenever the regulator is removed. Storing cylinders near heat or leaving valves open creates serious hazards.

Question 7Collision Repair Welding Safety and Shop Practices

Which condition indicates that the welding cable or ground clamp needs repair before use?

  1. The cable is coiled loosely on a hanger
  2. The cable insulation shows cracks or exposed conductor Correct answer.
  3. The ground clamp is attached to clean bare metal
  4. The welder is set to the recommended voltage

Explanation

Cracked insulation or exposed conductor on a welding cable presents shock and fire hazards and must be repaired or replaced before welding. A properly attached clamp on clean metal and correct settings are normal operating conditions.

Question 8Collision Repair Welding Safety and Shop Practices

Why should the ground clamp be attached as close as possible to the weld area on the same panel?

  1. To keep welding current on a short, direct path and reduce damage to sensitive components Correct answer.
  2. To prevent the panel from warping during welding
  3. To allow the welder to run at a lower duty cycle
  4. To increase the shielding-gas flow rate

Explanation

A short ground path keeps welding current localized so it does not travel through bearings, electronics, or other paths where it can cause damage. It also improves arc stability. Warpage and gas flow are controlled by technique and settings, not clamp location.

Question 9Collision Repair Welding Safety and Shop Practices

What is the correct action when a technician notices a strong smell of shielding gas in the shop?

  1. Ignore it because shielding gas is non-toxic
  2. Increase the gas flow to clear the line
  3. Continue welding but open a window
  4. Stop work, check for leaks at the regulator and fittings, and ventilate the area Correct answer.

Explanation

A persistent gas smell usually indicates a leak at a fitting or regulator, and accumulated shielding gas can displace oxygen in a confined space. Work should stop until the leak is found and corrected.

Question 10Collision Repair Welding Safety and Shop Practices

Which practice best prevents burns from hot metal during and after collision welding?

  1. Relying on color to judge that a part is safe to touch
  2. Marking hot areas and using tongs or pliers to handle freshly welded parts Correct answer.
  3. Wearing gloves only while the arc is on
  4. Cooling parts by dipping them in a solvent bath

Explanation

Welded parts stay hot well after the arc stops, so they should be handled with tools and clearly marked as hot. Gloves should remain on during handling, and color is not a reliable indicator of temperature.

Question 11Collision Repair Welding Safety and Shop Practices

A technician is preparing to make a plug weld through a replacement panel. Which step protects adjacent interior trim and wiring?

  1. Wrap the wiring in paper towels
  2. Remove or shield trim and wiring from sparks and heat before welding Correct answer.
  3. Spray water on the interior carpet
  4. Weld quickly to minimize exposure time

Explanation

Sparks and heat can ignite or melt interior materials behind the weld zone, so trim and wiring must be removed or protected with heat-resistant shielding. Speed alone does not eliminate the risk.

Question 12Collision Repair Welding Safety and Shop Practices

What does the term duty cycle mean on a collision repair welding machine?

  1. The number of welds required per panel
  2. The ratio of shielding gas to base metal
  3. The percentage of a ten-minute period the machine can weld at a given output without overheating Correct answer.
  4. The time required for the weld to cool

Explanation

Duty cycle is the portion of a ten-minute period a welder can operate at a rated output before thermal protection engages. Exceeding it causes the machine to shut down or degrade weld quality.

Question 13Collision Repair Welding Safety and Shop Practices

Why is it important to follow OEM welding and sectioning procedures rather than shop habit?

  1. OEM procedures specify approved weld types, locations, and materials that preserve structural integrity Correct answer.
  2. Following habit reduces the need for PPE
  3. OEM procedures only apply to aluminum vehicles
  4. Shop habit is always faster and therefore preferred

Explanation

OEM procedures identify the correct weld process, joint configuration, and locations for structural repairs so crash energy management is preserved. Substituting habit can compromise occupant protection.

Question 14Collision Repair Welding Safety and Shop Practices

A technician is welding galvanized steel. What additional precaution is most important?

  1. Use respiratory protection and remove or ventilate away zinc oxide fume Correct answer.
  2. Weld without shielding gas
  3. Use a lower shade lens
  4. Increase travel speed to avoid penetration

Explanation

Galvanized coatings produce zinc oxide fume that can cause metal fume fever, so the coating should be removed from the weld zone where permitted and fume must be extracted or the technician protected with appropriate respiratory PPE.

Question 15Collision Repair Welding Safety and Shop Practices

Which statement about welding near a vehicle's high-voltage battery system on a hybrid or electric vehicle is correct?

  1. High-voltage cables can be moved aside with bare hands
  2. Welding may proceed as long as the key is off
  3. Welding current cannot affect high-voltage components
  4. The high-voltage system must be de-energized per OEM procedure and the area assessed before welding Correct answer.

Explanation

Hybrid and electric vehicles require the high-voltage system to be de-energized following OEM procedures before welding, and high-voltage components must be located and protected. Welding current and heat can damage these systems or create shock hazards.

Question 16Collision Repair Welding Safety and Shop Practices

What is the correct way to store a welding helmet between jobs to maintain protection?

  1. Store it in a clean, dry location away from spatter and chemicals Correct answer.
  2. Leave it in the weld area to stay warm
  3. Place it face down on the bench to keep dust out
  4. Hang it by the headband on the welder

Explanation

Helmets and filter lenses should be stored clean and dry away from contaminants that can scratch or degrade the lens. Placing a helmet face down or near the weld area risks damage to the filter.

Question 17Collision Repair Welding Safety and Shop Practices

A technician is welding overhead in a wheelhouse and sparks are falling toward the floor. Which control is most appropriate?

  1. Wear a second pair of gloves
  2. Turn off the fume extractor to reduce draft
  3. Use a fire-resistant blanket to catch sparks and keep a fire watch Correct answer.
  4. Weld only in short bursts without a watch

Explanation

Overhead welding sends sparks downward, so a fire-resistant blanket or shield should catch them and a fire watch should monitor for smoldering materials. PPE alone does not control where sparks land.

Question 18Collision Repair Welding Safety and Shop Practices

Which factor most directly determines the required shade number for a welding filter lens?

  1. The length of the welding cable
  2. The color of the vehicle being repaired
  3. The type of ground clamp installed
  4. The welding process and the amperage being used Correct answer.

Explanation

Filter shade selection is based on the welding process and current level, since arc intensity and radiation increase with amperage. Vehicle color, cable length, and clamp type do not affect the needed shade.

Question 19Collision Repair Welding Safety and Shop Practices

Why should a technician avoid wearing synthetic clothing with cuffs or frayed edges while welding?

  1. Synthetics interfere with shielding-gas flow
  2. Synthetics melt and can cause severe burns when exposed to sparks Correct answer.
  3. Synthetics reduce the welder's duty cycle
  4. Synthetics attract the arc and weaken the weld

Explanation

Many synthetic fabrics melt and adhere to skin when struck by sparks, producing worse burns than flame-resistant cotton or leather. Cuffs can also trap sparks, so proper welding apparel should be worn.

Question 20Collision Repair Welding Safety and Shop Practices

A technician must make a weld near a plastic bumper cover that cannot be removed. What is the best practice?

  1. Weld at a lower voltage and leave the cover in place
  2. Cut away the cover and discard it
  3. Spray the cover with solvent to keep it cool
  4. Use heat-resistant shielding and monitor the cover for heat damage during welding Correct answer.

Explanation

Plastic covers can melt or ignite from conducted heat and spatter, so heat-resistant shielding and monitoring are needed when removal is not possible. Solvents near heat create fire and fume hazards.

Question 21Collision Repair Welding Safety and Shop Practices

What is the purpose of a fire watch during and after hot work?

  1. To watch the weld pool for porosity
  2. To check the shielding-gas pressure
  3. To record the welder's duty cycle
  4. To monitor the work area for ignition and extinguish small fires during and after welding Correct answer.

Explanation

A fire watch is assigned to watch for sparks igniting materials and to respond immediately to fire during hot work and for a period afterward. Weld quality and gas pressure are separate checks.

Question 22Collision Repair Welding Safety and Shop Practices

A technician finds the welding machine's thermal overload has tripped during a long repair. What is the correct response?

  1. Increase amperage to compensate for the interruption
  2. Bypass the thermal protection to finish the job
  3. Reset immediately and continue at the same settings
  4. Allow the machine to cool, then resume within its rated duty cycle Correct answer.

Explanation

Thermal overload indicates the machine exceeded its duty cycle, so it should be allowed to cool before resuming within rated limits. Bypassing protection or raising amperage risks equipment failure and poor welds.

Question 23Collision Repair Welding Safety and Shop Practices

Which practice correctly manages weld spatter on a vehicle surface adjacent to the repair area?

  1. Wipe the area with solvent after welding only
  2. Increase wire feed speed to reduce spatter
  3. Cover glass with cardboard
  4. Apply anti-spatter compound or heat-resistant covers to protect glass and painted surfaces Correct answer.

Explanation

Spatter adheres to glass and paint and can be difficult or impossible to remove, so surfaces should be protected with anti-spatter products or heat-resistant covers before welding. Cardboard is combustible and post-weld cleaning does not undo damage.

Question 24Collision Repair Welding Safety and Shop Practices

Why should welding be performed with the vehicle properly grounded and the welder connected to a known-good earth ground?

  1. To eliminate the need for a fire watch
  2. To increase the weld penetration depth
  3. To allow welding without PPE
  4. To reduce the risk of electric shock and provide a safe return path for current Correct answer.

Explanation

Proper grounding of the welder and a good work connection provide a controlled return path for current, reducing shock and stray-current hazards. Grounding does not replace fire prevention or PPE.

Question 25Welding Symbols, Joint Design, and Vehicle Body Construction

On an AWS welding symbol, what does the tail of the reference line contain?

  1. The length of the weld in millimeters
  2. The electrode classification only
  3. The number of weld passes required
  4. The specification, process, or other reference information Correct answer.

Explanation

The tail is the optional element at the far end of the reference line and it carries supplementary reference data such as the welding process, specification, or procedure designation. When no tail is shown, that reference information is simply omitted from the symbol.

Question 26Welding Symbols, Joint Design, and Vehicle Body Construction

A welding symbol shows the weld symbol placed below the reference line, with no arrow-side distinction noted. Where is the weld applied?

  1. On the arrow side of the joint Correct answer.
  2. On the other side of the joint
  3. On the far edge of the base metal only
  4. On both sides of the joint

Explanation

The reference line divides arrow-side from other-side information. A weld symbol placed below the reference line designates the arrow side, while one above the line designates the other side, which is why the arrow's placement on the joint matters.

Question 27Welding Symbols, Joint Design, and Vehicle Body Construction

A fillet weld symbol carries a dimension of 6 with a length of 50-25. What does the 25 represent?

  1. The pitch, or center-to-center spacing of the increments Correct answer.
  2. The number of increments
  3. The weld size in millimeters
  4. The root opening in millimeters

Explanation

In a length-pitch designation, the first number is the length of each increment and the number after the dash is the pitch, the center-to-center distance between increments. The 6 preceding the length is the fillet weld leg size.

Question 28Welding Symbols, Joint Design, and Vehicle Body Construction

What does the all-around weld symbol, a circle at the junction of the reference line and arrow, indicate?

  1. The weld requires a backing strip
  2. The weld is made in the field
  3. The weld continues completely around the joint Correct answer.
  4. The weld is a tack weld only

Explanation

The circle at the elbow of the reference line and arrow signifies an all-around weld, meaning the weld extends around the entire perimeter of the joint. It is distinct from the field weld flag, which is a separate symbol element.

Question 29Welding Symbols, Joint Design, and Vehicle Body Construction

A groove weld symbol shows a V shape with the letter C placed above the weld symbol on the reference line. What does the C indicate?

  1. A concave finish contour Correct answer.
  2. A convex finish contour
  3. A chipping allowance
  4. A flush finish contour

Explanation

Contour letters are placed above or below the weld symbol to specify the finished shape. C denotes concave, X denotes convex, and F denotes flush, so the C here calls for a concave contour.

Question 30Welding Symbols, Joint Design, and Vehicle Body Construction

A groove weld symbol includes a small square placed at the root of the groove symbol, on the arrow side. What does that square indicate?

  1. The weld is to be made from the other side
  2. The joint requires a permanent backing strip
  3. A backing or root pass requirement Correct answer.
  4. The groove must be machined

Explanation

The square at the root of a groove symbol is the melt-through or backing symbol element indicating that a backing, root pass, or melt-through is specified. It is not the same as the backing strip note, which appears in the tail.

Question 31Welding Symbols, Joint Design, and Vehicle Body Construction

In a plug weld symbol, what does the dimension placed to the left of the weld symbol specify?

  1. The pitch of the holes
  2. The depth of penetration
  3. The weld length
  4. The diameter of the hole at the root Correct answer.

Explanation

For plug and slot welds, the dimension to the left of the symbol gives the hole diameter or slot width at the root. The angle and depth of fill, when specified, appear inside the symbol.

Question 32Welding Symbols, Joint Design, and Vehicle Body Construction

A welding symbol for a square groove weld shows a root opening dimension inside the groove symbol. What does this dimension control?

  1. The depth of the groove preparation
  2. The length of the weld increment
  3. The gap between the two members before welding Correct answer.
  4. The leg size of the finished weld

Explanation

The root opening dimension in a groove weld symbol specifies the gap left between the abutting members at the root before welding. Groove depth and weld size are separate dimensions that may also be shown.

Question 33Welding Symbols, Joint Design, and Vehicle Body Construction

Which joint type places two members end to end in the same plane and is commonly joined with a groove weld?

  1. Lap joint
  2. Butt joint Correct answer.
  3. T-joint
  4. Corner joint

Explanation

A butt joint brings two members together edge to edge in the same plane, which is why a groove weld is the typical choice. The other joint types involve overlapping, perpendicular, or angled member arrangement.

Question 34Welding Symbols, Joint Design, and Vehicle Body Construction

A technician must weld a bracket to a frame member where the bracket sits perpendicular to the frame face, forming a T. Which joint type and typical weld apply?

  1. Lap joint with a plug weld
  2. T-joint with fillet welds on both sides Correct answer.
  3. Butt joint with a V-groove weld
  4. Edge joint with a square groove weld

Explanation

When one member stands perpendicular to the face of another, the configuration is a T-joint, and fillet welds on each side of the standing member are the standard approach. Butt and edge joints require the members to be aligned rather than perpendicular.

Question 35Welding Symbols, Joint Design, and Vehicle Body Construction

What is the primary reason a groove weld joint is often prepared with a bevel or V shape on thick material?

  1. To eliminate the need for any root opening
  2. To allow full penetration through the thickness of the members Correct answer.
  3. To allow the weld to be made with a single pass at low current
  4. To reduce the amount of base metal required

Explanation

Groove preparation opens the joint so the arc can reach the root and fuse the full thickness of the members. Without the bevel, thick material would only permit shallow fusion at the surface.

Question 36Welding Symbols, Joint Design, and Vehicle Body Construction

Why is a lap joint often preferred over a butt joint when joining two thin sheet metal panels?

  1. It eliminates the need for any weld on the back side
  2. It requires a groove to be machined on both edges
  3. It tolerates fit-up variation and needs less edge preparation Correct answer.
  4. It provides full penetration through both members

Explanation

A lap joint only needs one member to overlap the other, so edge preparation and precise fit-up are less critical, which suits thin sheet. A butt joint on thin sheet demands closer alignment and edge preparation to avoid burn-through.

Question 37Welding Symbols, Joint Design, and Vehicle Body Construction

A fillet weld symbol shows a size of 8 mm with a length of 100 mm and no pitch. What does the absence of a pitch value indicate?

  1. The weld is continuous over the stated length Correct answer.
  2. The weld size varies along the length
  3. The weld is intermittent with equal increments
  4. The weld is a single tack at the center

Explanation

When only a length is given with no pitch after a dash, the weld is continuous for that length. A pitch value would convert the designation to an intermittent weld with spaced increments.

Question 38Welding Symbols, Joint Design, and Vehicle Body Construction

A welding symbol carries a flag at the junction of the reference line and arrow. What does the flag signify?

  1. The weld requires a backing strip
  2. The weld is to be made in the field rather than the shop Correct answer.
  3. The weld is an all-around weld
  4. The weld must be inspected by radiography

Explanation

The flag indicates a field weld, meaning the weld is performed at the installation site rather than in the fabrication shop. The all-around circle and the backing note are separate symbol elements.

Question 39Welding Symbols, Joint Design, and Vehicle Body Construction

On a welding symbol, a groove weld symbol is placed above the reference line and a fillet weld symbol below it. What does this combination specify?

  1. Both welds on the other side
  2. A groove weld on the arrow side and a fillet weld on the other side
  3. Both welds on the arrow side
  4. A groove weld on the other side and a fillet weld on the arrow side Correct answer.

Explanation

Symbols above the reference line designate the other side, and symbols below designate the arrow side. This symbol therefore calls for a groove weld on the other side and a fillet weld on the arrow side.

Question 40Welding Symbols, Joint Design, and Vehicle Body Construction

What does the tail of a welding symbol contain when the symbol is drawn with a tail and a process designation such as GMAW?

  1. Supplementary reference information such as the welding process Correct answer.
  2. The joint type
  3. The weld size
  4. The number of passes

Explanation

The tail holds reference information, and a process designation like GMAW placed there tells the welder which process to use. Size, length, and pitch dimensions belong on the weld symbol and reference line.

Question 41Welding Symbols, Joint Design, and Vehicle Body Construction

A weld symbol shows a fillet with a size of 5 and a length of 40-80. What does this designation describe?

  1. Two fillet welds each 80 mm long
  2. Continuous fillet weld 80 mm long with 40 mm legs
  3. A fillet weld with 5 mm root opening and 40 mm depth
  4. Intermittent fillet welds with 40 mm increments spaced 80 mm on center Correct answer.

Explanation

The size 5 sets the fillet leg, and the 40-80 designation gives increment length and pitch. This produces intermittent fillet welds with 40 mm increments at 80 mm center-to-center spacing.

Question 42Welding Symbols, Joint Design, and Vehicle Body Construction

Why does a square groove weld on thin material typically require a smaller root opening than a V-groove on thick plate?

  1. Thick plate is always welded with a square groove
  2. Root opening is unrelated to material thickness
  3. Thin material requires a larger bevel angle to reach the root
  4. Thin material needs less gap to achieve fusion without burn-through Correct answer.

Explanation

On thin sheet, a large root gap risks burn-through and distortion, so a small gap is sufficient for fusion. Thick plate needs a wider opening and groove preparation so the arc can penetrate the full section.

Question 43Welding Symbols, Joint Design, and Vehicle Body Construction

A welding symbol shows a slot weld symbol with a length and a pitch. What does the pitch specify in this context?

  1. The depth of fill in each slot
  2. The center-to-center distance between adjacent slots Correct answer.
  3. The width of each slot
  4. The angle of the slot preparation

Explanation

For slot welds, the pitch gives the center-to-center spacing between successive slots. Slot width and depth of fill are separate dimensions shown elsewhere in the symbol.

Question 44Welding Symbols, Joint Design, and Vehicle Body Construction

What is the function of a backing symbol placed at the root of a groove weld symbol?

  1. It indicates the weld is all-around
  2. It indicates a backing or root pass is specified at the root Correct answer.
  3. It indicates the weld must be made in the field
  4. It indicates a flush contour is required

Explanation

The backing symbol at the root of a groove weld indicates that a backing, root pass, or melt-through is specified. It is a separate element from the field flag and the all-around circle.

Question 45Welding Symbols, Joint Design, and Vehicle Body Construction

A body technician is joining two panels where one overlaps the other and both edges are accessible. Which weld and joint combination best fits this configuration?

  1. T-joint with a groove weld on the standing member
  2. Lap joint with fillet welds along the overlap edge Correct answer.
  3. Butt joint with a square groove weld
  4. Edge joint with a plug weld through both flanges

Explanation

When one panel overlaps another and the edges are accessible, a lap joint with a fillet weld along the edge is the direct fit. Butt joints require aligned edges, and T-joints involve perpendicular members.

Question 46Welding Symbols, Joint Design, and Vehicle Body Construction

On a groove weld symbol, a dimension is placed inside the groove symbol to the left of the groove shape. What does this dimension represent?

  1. The weld length
  2. The root opening
  3. The groove depth or size of the groove preparation Correct answer.
  4. The pitch of the weld

Explanation

A dimension inside the groove symbol, to the left of the shape, gives the groove depth or size of the preparation. The root opening appears as a separate dimension inside the symbol, and length and pitch appear to the right.

Question 47Welding Symbols, Joint Design, and Vehicle Body Construction

Why is a single-sided V-groove weld sometimes preferred over a double-V groove on a thick joint with access to one side only?

  1. It provides deeper penetration than a double-V from one side
  2. It allows the weld to be made in a single pass regardless of thickness
  3. It can be completed from the accessible side without back gouging the far side Correct answer.
  4. It eliminates the need for any root opening

Explanation

With access to only one side, a single-V groove allows the weld to be completed without turning the work or back gouging the far side. A double-V requires access to both sides and is used when both faces are available.

Question 48Welding Symbols, Joint Design, and Vehicle Body Construction

A welding symbol shows a fillet weld on both sides of a T-joint, each with a size of 6 mm. How is this typically shown on the symbol?

  1. A single fillet symbol above the line with size 12
  2. A groove symbol with a root opening of 6
  3. A single fillet symbol below the line with size 6
  4. A fillet symbol above and below the reference line, each with a size of 6 Correct answer.

Explanation

Welds on both sides are shown by placing a fillet symbol both above and below the reference line, each carrying its own size. A single symbol would call out only one side.

Question 49GMAW (MIG) Equipment Setup, Shielding Gas, and Consumables

On a GMAW welder, what does the wire feed speed control primarily determine?

  1. Travel speed of the torch
  2. Shielding gas flow rate
  3. Arc voltage
  4. Welding current (amperage) Correct answer.

Explanation

In constant-voltage GMAW, wire feed speed sets the burn-off rate and therefore the welding current; increasing WFS raises amperage. Arc voltage is set separately on the machine's voltage control.

Question 50GMAW (MIG) Equipment Setup, Shielding Gas, and Consumables

For short-circuit transfer GMAW on thin sheet steel, which shielding gas mix is most typical?

  1. 98% argon / 2% oxygen
  2. 75% argon / 25% CO2 Correct answer.
  3. 100% CO2 only
  4. 100% helium

Explanation

Short-circuit transfer on carbon steel commonly uses a 75% argon/25% CO2 (or similar C25) mix, which stabilizes the arc and gives good wetting at low heat input. Pure CO2 is also used but runs hotter and spatters more; helium and argon/oxygen are for other applications.