Saudi Skill Verification Program - Welder

What is the recommended filter lens shade number for Shielded Metal Arc Welding (SMAW) when using an arc current of 150 Amperes?

• AShade 5 to 7
• BShade 8 to 9
• CShade 10 to 11
• DShade 14 to 15

Welding in the presence of chlorinated degreasing solvent vapors (such as trichloroethylene) presents a severe hazard due to the potential formation of which toxic gas?

• APhosgene gas
• BCarbon monoxide
• COzone
• DHydrogen sulfide

Why must acetylene cylinders always be stored and operated in an upright (vertical) position?

• ATo prevent liquid acetone from escaping with the gas and damaging equipment
• BTo keep the cylinder safety cap from coming loose during pressure releases
• CTo allow the cylinder porous filler material to settle evenly at the bottom
• DTo maintain a higher gas pressure within the cylinder neck space

What is the only safe and approved method for testing oxy-fuel gas hoses and connections for leaks?

• AHolding a lit match or lighter near the joints to check for a flame
• BApplying a specialized oil-free soap and water solution and watching for bubbles
• CListening closely for hissing sounds while spraying WD-40 onto the fittings
• DSubmerging the entire hose assembly in a tank of mineral oil under pressure

According to standard hot work permit regulations, what is the minimum radius of the spark-containment zone that must be cleared of combustibles before welding?

• A10 feet (3 meters)
• B20 feet (6 meters)
• C35 feet (11 meters)
• D75 feet (23 meters)

Which of the following electrical terms refers to the voltage present between the electrode holder and the work lead when the welding machine is turned on but no arc is struck?

• AArc voltage
• BOpen circuit voltage (OCV)
• COperating voltage
• DSecondary circuit drop

Why is wearing synthetic clothing (such as polyester or nylon) strictly prohibited while performing welding operations?

• ASynthetics generate static electricity that can interfere with high-frequency arc starters
• BSynthetics melt when exposed to hot slag and sparks, causing severe skin burns
• CSynthetic fibers degrade rapidly when exposed to shielding gases like helium
• DSynthetic materials block heat release, leading to rapid heat exhaustion of the welder

When performing welding operations inside a confined space, where should the gas cylinders and welding power sources be located?

• AInside the confined space, close to the welder for quick emergency shutdown
• BOutside the confined space, with lines routed inside and monitored by an attendant
• CSuspended above the confined space entrance to prevent gas build-ups
• DIn a separate ventilated storage room at least 50 meters away from the area

What is the primary objective of using local exhaust ventilation (LEV) systems at the source of a welding operation?

• ATo cool down the weld metal rapidly to prevent thermal distortion
• BTo pull welding fumes and gases away from the welder's breathing zone
• CTo supply fresh oxygen to the welding arc to stabilize the plasma column
• DTo dilute the concentration of shielding gas so it does not displace oxygen in the room

Which of the following practices is correct and safe when moving high-pressure gas cylinders in a workshop?

• ARolling the cylinders horizontally along the floor using foot pressure
• BLifting cylinders by their protective valve caps using a crane magnet
• CSecuring the safety cap and moving the cylinders in an approved wheeled cart
• DDragging the cylinders by their valves to avoid lifting hazards

What is the primary function of a flashback arrestor installed in an oxy-fuel system?

• ATo prevent gas flow in the reverse direction if pressure drops in one hose
• BTo extinguish and stop a flame traveling back through the torch into the hoses and regula…
• CTo increase the pressure of the fuel gas at the nozzle tip for cleaner cuts
• DTo automatically shut off the cylinder valves in case of hose leaks

If a coworker is receiving an electric shock from an active welding circuit, what is the first step you should take?

• APull the victim away from the electrode immediately with your bare hands
• BShut off the welding power source or isolate the electrical supply line
• CThrow water on the victim to cool the current pathway and reduce burns
• DBegin cardiopulmonary resuscitation (CPR) immediately while the victim is in contact with…

After hot work welding is completed, how long must a dedicated fire watch remain at the work site to monitor for smoldering fires?

• AAt least 10 minutes
• BAt least 30 minutes
• CExactly 1 hour
• DAt least 4 hours

What is the primary danger when welding or cutting on a sealed metal drum or closed container that previously held flammable materials?

• ARapid heat transfer will melt the container bottom, causing weld spillages
• BHeat from the arc will cause chemical vapor expansion, leading to a catastrophic explosion
• CThe metal will become too hard to weld due to carburization from the residual oils
• DThe shielding gas will leak through the metal pores, creating porosity in the weld bead

Why are foam earplugs generally preferred over external earmuffs during overhead welding operations?

• AEarmuffs degrade the shielding gas envelope by creating turbulence
• BSparks and hot slag can fall behind or under earmuffs, trapping heat and causing burns
• CFoam earplugs absorb radiant ultraviolet light, protecting the inner ear canal
• DEarmuffs restrict head movement, preventing proper weld line viewing

When setting up a Shielded Metal Arc Welding (SMAW) machine for DCEP (Direct Current Electrode Positive) polarity, where are the leads connected?

• AThe electrode holder connects to the positive terminal; the work lead connects to the neg…
• BThe electrode holder connects to the negative terminal; the work lead connects to the pos…
• CBoth leads connect to the positive terminal via a heavy-duty jumper strap
• DThe leads are connected to an AC transformer terminal block to split the phase

A welding machine has a duty cycle rating of 60% at 200 Amperes. What does this rating mean for operator usage?

• AThe machine can weld continuously for 6 hours out of a 10-hour shift
• BThe machine can operate at 200 Amperes for 6 minutes out of any 10-minute period before n…
• CThe arc will lose 40% of its stable power output after 6 minutes of continuous operation
• DThe machine requires a cooling period of 60 seconds after every 100 seconds of welding

Which tungsten electrode type is traditionally recommended for welding aluminum with Alternating Current (AC) because it forms a clean, balled tip?

• APure tungsten (EWP, Green color code)
• B2% Thoriated tungsten (EWTh-2, Red color code)
• C2% Lanthanated tungsten (EWLa-2, Blue color code)
• DZirconiated tungsten (EWZr-1, Brown color code)

In Gas Metal Arc Welding (GMAW), which mode of metal transfer requires the highest current and voltage settings and an argon-rich shielding gas?

• AShort-circuiting transfer
• BGlobular transfer
• CSpray transfer
• DPulsed transfer

What is the difference between self-shielded Flux-Cored Arc Welding (FCAW-S) and gas-shielded Flux-Cored Arc Welding (FCAW-G)?

• AFCAW-S uses a solid wire, while FCAW-G uses a hollow flux-filled wire
• BFCAW-S relies solely on the internal flux core decomposition to shield the arc, while FCA…
• CFCAW-S requires DCEP polarity, while FCAW-G is operated exclusively on AC current
• DFCAW-S is used only for non-ferrous metals, whereas FCAW-G is restricted to carbon steel

What is the primary function of the high-frequency (HF) circuit setting on a Gas Tungsten Arc Welding (GTAW) machine?

• ATo increase the welding speed by oscillating the arc laterally
• BTo allow arc initiation without touching the tungsten electrode to the workpiece
• CTo convert low-voltage DC current into high-voltage AC current
• DTo preheat the filler wire before it enters the weld puddle

What is the direct operating result of increasing the arc length during Shielded Metal Arc Welding (SMAW)?

• AArc voltage increases, welding amperage decreases, and spatter increases
• BArc voltage decreases, welding amperage increases, and penetration deepens
• CBoth voltage and amperage increase, causing the electrode to freeze
• DThe shielding gas flow rate increases to compensate for atmospheric exposure

In Gas Metal Arc Welding (GMAW), adjusting the wire feed speed directly controls which electrical parameter of the welding arc?

• AArc voltage
• BWelding amperage
• COpen circuit potential
• DHigh frequency intensity

What is the purpose of adjusting the 'post-flow' gas timer on a Gas Tungsten Arc Welding (GTAW) machine?

• ATo purge the gas delivery lines of atmospheric air before striking the arc
• BTo continue shielding gas flow after the arc stops, protecting the cooling weld puddle an…
• CTo cool the internal power transformer after a long welding pass
• DTo inject additional oxygen into the weld toe to smooth the bead profile

What are the standard units of measurement used for specifying shielding gas flow rates on welding flowmeters?

• APounds per square inch (PSI) or Bar
• BCubic feet per hour (CFH) or Liters per minute (LPM)
• CGallons per minute (GPM) or Liters per hour (LPH)
• DAmperes per second (A/s) or Duty percentage

Why is Direct Current (DC) polarity generally preferred over Alternating Current (AC) for Shielded Metal Arc Welding (SMAW) with E7018 electrodes?

• ADC provides a smoother, more stable arc with less spatter and better bead control
• BAC causes the iron powder in the electrode coating to melt too quickly, causing slag runo…
• CDC prevents the workpiece from becoming magnetic during long welding passes
• DAC requires twice the voltage of DC, posing a higher electric shock risk

Which gas mixture is considered the industry standard shielding gas for short-circuit Gas Metal Arc Welding (GMAW) on carbon steel?

• A100% Helium
• B75% Argon / 25% Carbon Dioxide (C25)
• C98% Argon / 2% Oxygen
• D50% Argon / 50% Hydrogen

Why is DCEN (Direct Current Electrode Negative) polarity preferred for gas tungsten arc welding (GTAW) of carbon and stainless steels?

• AIt focuses 70% of the arc heat on the workpiece, producing deep, narrow penetration
• BIt creates an oxide-cleaning action that strips impurities off the steel surface
• CIt keeps the tungsten electrode cooler by directing all heat toward the torch handle
• DIt allows the use of pure green-coded tungsten electrodes without balling

What is Contact Tip to Work Distance (CTWD) in Gas Metal Arc Welding (GMAW), and why is it important?

• AThe physical length of the gun nozzle; it dictates the hand clearance
• BThe distance from the end of the contact tip to the workpiece; it affects wire preheating…
• CThe distance between the grounding clamp and the weld pool; it prevents electrical short-…
• DThe distance the filler wire is fed before the shielding gas flow starts

Which polarity is typically recommended for self-shielded Flux-Cored Arc Welding (FCAW-S) electrodes like E71T-8?

• ADCEP (Direct Current Electrode Positive)
• BDCEN (Direct Current Electrode Negative)
• CAC (Alternating Current)
• DHigh Frequency pulsed AC

What is the phenomenon of 'arc blow' in SMAW, and how can the welder best minimize its effects?

• AThe arc extinguishing due to high wind speeds; minimize by using wind screens
• BThe deflection of the welding arc from its normal path due to magnetic forces; minimize b…
• CThe rapid burning of the electrode coating due to high voltage; minimize by reducing volt…
• DThe shielding gas blowing away the molten metal; minimize by reducing gas pressure

Which shielding gas is recommended for Gas Tungsten Arc Welding (GTAW) of stainless steel to ensure clean welds without carbon pick-up?

• A100% Carbon Dioxide (CO2)
• B100% Argon
• C75% Argon / 25% CO2
• D95% Argon / 5% Oxygen

What is the primary cause of 'stubbing' in Gas Metal Arc Welding (GMAW)?

• AThe wire feed speed is set too high, or the welding voltage is set too low
• BThe contact tip diameter is too large for the wire size
• CThe shielding gas flow rate is exceeding 50 CFH, blowing out the arc
• DThe grounding clamp has been placed too close to the weld start point

What is the consequence of using a welding cable that has an undersized cross-sectional area (too thin) or is excessively long?

• AThe welding machine will automatically increase voltage to prevent resistance
• BIt will cause a significant voltage drop at the arc and cause the cable to overheat
• CThe welding polarity will automatically reverse from DCEP to DCEN
• DThe electrode coating will burn off more slowly due to electromagnetic drag

What is the primary function of introducing a purging gas (usually Argon) inside a pipe during GTAW root welding?

• ATo cool the inside of the pipe to prevent the weld metal from sagging
• BTo displace oxygen on the backside of the joint, preventing weld oxidation and 'sugaring'
• CTo increase the internal pressure to force the root bead flush with the pipe wall
• DTo chemically clean the internal pipe wall of scale and rust during heating

What is the effect of an excessively fast travel speed on the characteristics of a weld bead?

• AThe bead becomes wide with deep penetration and excessive reinforcement
• BThe bead becomes narrow and high, with reduced penetration and potential undercut
• CThe slag becomes thicker and impossible to remove from the weld face
• DThe arc voltage increases automatically to maintain deposition volume

During multi-pass Flux-Cored Arc Welding (FCAW-G), what is the most common cause of slag inclusion defects?

• AFailing to clean the slag off the previous weld bead before depositing the next pass
• BUsing a shielding gas flow rate that is too high, freezing the slag in the metal
• CUsing DCEN polarity instead of DCEP, which draws slag into the root
• DThe wire feeding too slowly, allowing the slag to run ahead of the weld pool

Which machine parameter is directly adjusted by the operator on a Shielded Metal Arc Welding (SMAW) power source to control heat input?

• AVoltage (Volts)
• BCurrent (Amperes)
• CWire feed speed (IPM)
• DGas flow rate (CFH)

What is the primary cause of tungsten electrode contamination during Gas Tungsten Arc Welding (GTAW)?

• AAllowing the tungsten to contact the molten weld pool or the filler rod
• BUsing high-frequency arc starting on stainless steel
• COperating with too much post-flow gas time after the weld ends
• DWelding with DCEN polarity instead of AC on carbon steel

What is the purpose of adjusting the 'inductance' control on a Gas Metal Arc Welding (GMAW) machine during short-circuit transfer?

• ATo increase the speed at which the shielding gas flow is initiated
• BTo control the rate of current rise during the short-circuit phase, reducing weld spatter
• CTo increase the high frequency voltage for starting the arc
• DTo adjust the physical thickness of the copper wire insulation inside the torch

Why does Shielded Metal Arc Welding (SMAW) require a constant current (CC) power source instead of constant voltage (CV)?

• ATo ensure the welding voltage remains completely flat regardless of arc length
• BTo keep the amperage stable when the welder's hand movements cause small changes in arc l…
• CTo allow the machine to run without a ground clamp connection
• DTo automatically feed the electrode at a constant rate

Why does Gas Metal Arc Welding (GMAW) utilize a constant voltage (CV) power source?

• ATo allow the welder to adjust the amperage dial on the torch handle while welding
• BTo maintain a constant arc length by automatically adjusting the current to melt the wire…
• CTo prevent the welding leads from overheating during high duty cycle runs
• DTo eliminate the need for a shielding gas regulator valve

Why is Alternating Current (AC) required when performing Gas Tungsten Arc Welding (GTAW) on aluminum alloys?

• AAluminum is non-magnetic and will repel DC arc currents
• BThe positive half-cycle cleans the tough oxide layer from the aluminum surface, while the…
• CAC current prevents the aluminum workpiece from melting too quickly due to its high therm…
• DAC allows the filler metal to be pre-deposited in the joint before starting the arc

Which gas mixture is typically required to transition into and maintain a stable 'spray transfer' mode during GMAW on carbon steels?

• A100% Carbon Dioxide (CO2)
• B95% Argon / 5% Oxygen or Carbon Dioxide
• C50% Nitrogen / 50% Argon
• D75% Helium / 25% Carbon Dioxide

Why must a wire feeder be equipped with knurled U-groove drive rolls when welding with Flux-Cored (FCAW) wires?

• AKnurled rolls help preheat the wire as it passes through the feeder
• BFlux-cored wire is tubular and soft; smooth V-groove rolls would require too much pressur…
• CKnurled rolls scrape the copper coating off the wire to improve electrical contact
• DU-groove knurled rolls prevent the internal flux powder from settling inside the wire cas…

In the AWS classification for SMAW carbon steel electrodes (e.g., E6010), what does the third digit '1' represent?

• AThe electrode can be used in the flat welding position only
• BThe electrode can be used in all welding positions (flat, horizontal, vertical, and overh…
• CThe electrode is designed for flat and horizontal fillet positions only
• DThe electrode must be operated using AC current only

What type of flux coating is applied to an AWS E7018 SMAW electrode, and what are its key characteristics?

• ACellulosic coating; high penetration, rapid freezing slag, high hydrogen content
• BRutile coating; medium penetration, smooth arc, easy slag removal
• CLow-hydrogen, iron powder coating; moderate penetration, high deposition rate, low weld m…
• DAcid-type silica coating; high speed, used only in flat groove positions