AIT First Year Weld Exam – Welding Fundamentals and Practical Skills
Assessment Review
What forms ozone? - correct answer ✔✔When oxygen and atmospheric air comes in contact
with ultraviolet light
Chlorinated solvents such as brake clean combined with ultraviolet light create? - correct
answer ✔✔Phosgene gas
dizziness and euphoria are signs of? - correct answer ✔✔Oxygen difficiency
Most wire fed applications use what type of current - correct answer ✔✔Direct current reverse
polarity, DCRP
A wire feeder system includes what? - correct answer ✔✔Drive roll system, variable speed
motor
Gun and cable assemblies are rated by what? - correct answer ✔✔Current carrying capacity
What is the purpose of a shielding gas - correct answer ✔✔Protect weld metal from
atmospheric air
The regulator does what? - correct answer ✔✔reduces gas source pressure to a working
pressure
What do flow metres do? - correct answer ✔✔Indicate volumetric flow rate in liters, per minute
or cubic feet per hour
,Construction of power sources and duty cycles are meant to specification of who? - correct
answer ✔✔NEMA
What type of volt amp curve does CV machines have? - correct answer ✔✔Relatively flat volt
amp curve
What type of volt amp curved do cc machines have - correct answer ✔✔Drooping volt amp
curve
Filler wires must be manufactured to? - correct answer ✔✔Match the chemistry of base metal
and mechanical properties such as tensile strength, ductility and impact strength
What csa specification covers filler metals - correct answer ✔✔Csa w48
What three types of wire drive systems are there - correct answer ✔✔Push, pull and push pull
Where are the drive rolls located in a push system - correct answer ✔✔In the wire feed unit
In a push system what is the max distance of cable - correct answer ✔✔15ft
Where are the drive rolls located in a pull system - correct answer ✔✔Mounted in the gun close
to the contact tip
What problem does the pull system overcome - correct answer ✔✔Wire hang ups with soft
wires
What type of wire is used in a pull system - correct answer ✔✔Small diameter or soft electrode
wires such as aluminum wires
, What is a pull system also known as - correct answer ✔✔Spool on gun
Push pull system has drive rolls where - correct answer ✔✔The gun and wire feeder
A push system is normally used for what types of welding? - correct answer ✔✔Gmaw, fcaw
and mcaw
Constant speed wire feeders use what power source - correct answer ✔✔CV
Voltage sensing wire feeders use what power source - correct answer ✔✔CC
CV power sources automatically adjust what - correct answer ✔✔Amperage output as the stick
out changes
Voltage sensing wire feeders set speed according to what - correct answer ✔✔Arc voltage
V groove and u groove drive rolls are used for what types of wires - correct answer ✔✔Solid
wire, as they provide a 3 point contact to grip the wire with minimum pressure while
maintaining the wires shape
Serrated or knurled drive rolls used for what type of wires? - correct answer ✔✔Flux cored and
metal cored wires (hollow wires)
When you change wire size what should you also change - correct answer ✔✔Drive rolls
Contact tubes do what? - correct answer ✔✔Transfer electrical current to the electrode and
direct wire to weld zone.
Assessment Review
What forms ozone? - correct answer ✔✔When oxygen and atmospheric air comes in contact
with ultraviolet light
Chlorinated solvents such as brake clean combined with ultraviolet light create? - correct
answer ✔✔Phosgene gas
dizziness and euphoria are signs of? - correct answer ✔✔Oxygen difficiency
Most wire fed applications use what type of current - correct answer ✔✔Direct current reverse
polarity, DCRP
A wire feeder system includes what? - correct answer ✔✔Drive roll system, variable speed
motor
Gun and cable assemblies are rated by what? - correct answer ✔✔Current carrying capacity
What is the purpose of a shielding gas - correct answer ✔✔Protect weld metal from
atmospheric air
The regulator does what? - correct answer ✔✔reduces gas source pressure to a working
pressure
What do flow metres do? - correct answer ✔✔Indicate volumetric flow rate in liters, per minute
or cubic feet per hour
,Construction of power sources and duty cycles are meant to specification of who? - correct
answer ✔✔NEMA
What type of volt amp curve does CV machines have? - correct answer ✔✔Relatively flat volt
amp curve
What type of volt amp curved do cc machines have - correct answer ✔✔Drooping volt amp
curve
Filler wires must be manufactured to? - correct answer ✔✔Match the chemistry of base metal
and mechanical properties such as tensile strength, ductility and impact strength
What csa specification covers filler metals - correct answer ✔✔Csa w48
What three types of wire drive systems are there - correct answer ✔✔Push, pull and push pull
Where are the drive rolls located in a push system - correct answer ✔✔In the wire feed unit
In a push system what is the max distance of cable - correct answer ✔✔15ft
Where are the drive rolls located in a pull system - correct answer ✔✔Mounted in the gun close
to the contact tip
What problem does the pull system overcome - correct answer ✔✔Wire hang ups with soft
wires
What type of wire is used in a pull system - correct answer ✔✔Small diameter or soft electrode
wires such as aluminum wires
, What is a pull system also known as - correct answer ✔✔Spool on gun
Push pull system has drive rolls where - correct answer ✔✔The gun and wire feeder
A push system is normally used for what types of welding? - correct answer ✔✔Gmaw, fcaw
and mcaw
Constant speed wire feeders use what power source - correct answer ✔✔CV
Voltage sensing wire feeders use what power source - correct answer ✔✔CC
CV power sources automatically adjust what - correct answer ✔✔Amperage output as the stick
out changes
Voltage sensing wire feeders set speed according to what - correct answer ✔✔Arc voltage
V groove and u groove drive rolls are used for what types of wires - correct answer ✔✔Solid
wire, as they provide a 3 point contact to grip the wire with minimum pressure while
maintaining the wires shape
Serrated or knurled drive rolls used for what type of wires? - correct answer ✔✔Flux cored and
metal cored wires (hollow wires)
When you change wire size what should you also change - correct answer ✔✔Drive rolls
Contact tubes do what? - correct answer ✔✔Transfer electrical current to the electrode and
direct wire to weld zone.
