CWB LEVEL 2 CLOSED BOOK
QUESTION EXAM WITH ANSWER
An arc plasma consists of - ANSWERSfree electrons and positive ions.
Which of the following welding processes is the most commonly used? - ANSWERSArc
Welding
The most arc efficient welding process is the _______ process. - ANSWERSSAW
Which two areas represent the largest voltage drop in a welding arc? -
ANSWERSCathode drop zone and Anode drop zone
The pinch force that aids in droplet detachment during spray transfer is produced by -
ANSWERSa self—induced magnetic field
Which of the following welding processes produces the least hydrogen weld metal
content?
a. SMAW
b. GTAW
c. SAW
d. FCAW - ANSWERSB. GTAW
he majority of the arc energy is transferred to the work when the GTAW process is
operated inpolarity.
a. AC
b. DCEP
c. DCEN - ANSWERSC. DCEN
Modern inverter GTAW power sources use all methods for arc starting, except for?
a. Scratch
b. High Frequency
c. Steel Wool
d. Electronic Touch - ANSWERSc. Steel Wool
he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced - ANSWERSDCEN
,The arc force control in CC welding power sources is used to ___________ in the
SMAW process.
a. reduce the penetration of the weld when the arc length is decreased
b. increase the penetration of the weld when the arc length is decreased
c. reduce the penetration of the weld when the arc length is increased
d. increase the penetration of the weld when the arc length is increased - ANSWERSb.
increase the penetration of the weld when the arc length is decreased
The function of the ingredients within the electrode coating of SMAW electrodes is to:
a. provide gas shielding, provide slag cover, scavenge impurities, stabilize the arc and
adding alloy elements
b. aid in the weld metal wetting the base metal
c. reduce arc blow
d. conduct a portion of the arc current - ANSWERSA. Provide gas shielding, provide
slag cover, scavenge impurities, stabilize the arc and adding alloy elements
The electrodes represented by EXX15, EXX16, and EXX18 have _________as a major
ingredient in the coating.
a. limestone
b. cellulose
c. titania - ANSWERSa.limestone
The GMAW, FCAW and MCAW processes have these features in common.
a. Constant current power source and constant speed wire feeder
b. Constant voltage power source and constant speed wire feeder
c. Constant current power source and variable speed wire feeder
d. Constant voltage power source and variable speed wire feeder - ANSWERSb.
Constant voltage power source and constant speed wire feeder
The welding current in the GMAW process is determined by which of the following
variables?
a. Wire feed speed
b. Voltage
c. Contact tube to work distance
d. Arc travel speed - ANSWERSa. Wire feed speed
What are the two power source variables that can be used to control spatter in GMAW
short circuit transfer.
a. Voltage and current
b. Input voltage and number of phases
c. Arc force and static characteristic
d. Inductance and static characteristic - ANSWERSd. inductance and static
characteristic
Which of the GMAW metal transfer modes can be used to weld out of position?
a. Globular and spray
, b. Short circuit and pulsed
c. Short circuit and globular
d. Spray and pulsed - ANSWERSb. Short circuit and pulsed
The shielding gas used in the GMAW process to produce short circuit transfer is
a. argon
b. argon with 15% carbon dioxide
c. helium
d. carbon dioxide - ANSWERSd. Carbon dioxide
Which shielding gas produces the most pronounced finger penetration for the GMAW
process?
a. Argon with 2% oxygen
b. Argon with 5% carbon dioxide
c. Argon with 25% carbon dioxide
d. Carbon dioxide - ANSWERSa. Argon with 2% oxygen
Which of the following statements is INCORRECT?
a. At a specific welding current and wire size the FCAW process has a higher deposition
rate than the GMAW process.
b. It is easier to change the chemical composition of the weld with the FCAW process
compared to the GMAW process
c. Just a) above
d. a) and b) above - ANSWERSD
Which type of weld metal transfer is produced using 75% argon and 25% carbon
dioxide shielding gas using high currents and basic fluxed cored wires?
a. Spray
b. Globular
c. Short circuit
d. Dip - ANSWERSa. Spray
Compared with the FCAW process the MCAW process has the following features.
a. Higher deposition rates for the same electrode size and current
b. Typically only used in the flat and horizontal position
c. Higher productivity because there is only islanding slag produced
d. All of the above - ANSWERSd. All of the above
Worm tracks produced using the FCAW process can be avoided by
a. using carbon dioxide shielding gas
b. increasing the contact tube to work distance
c. decreasing current and voltage
d. all of the above - ANSWERSd. all of the above
The submerged arc welding process incorporates
a. a continuously fed tubular wire and a constant current power source and a buried arc
QUESTION EXAM WITH ANSWER
An arc plasma consists of - ANSWERSfree electrons and positive ions.
Which of the following welding processes is the most commonly used? - ANSWERSArc
Welding
The most arc efficient welding process is the _______ process. - ANSWERSSAW
Which two areas represent the largest voltage drop in a welding arc? -
ANSWERSCathode drop zone and Anode drop zone
The pinch force that aids in droplet detachment during spray transfer is produced by -
ANSWERSa self—induced magnetic field
Which of the following welding processes produces the least hydrogen weld metal
content?
a. SMAW
b. GTAW
c. SAW
d. FCAW - ANSWERSB. GTAW
he majority of the arc energy is transferred to the work when the GTAW process is
operated inpolarity.
a. AC
b. DCEP
c. DCEN - ANSWERSC. DCEN
Modern inverter GTAW power sources use all methods for arc starting, except for?
a. Scratch
b. High Frequency
c. Steel Wool
d. Electronic Touch - ANSWERSc. Steel Wool
he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced - ANSWERSDCEN
,The arc force control in CC welding power sources is used to ___________ in the
SMAW process.
a. reduce the penetration of the weld when the arc length is decreased
b. increase the penetration of the weld when the arc length is decreased
c. reduce the penetration of the weld when the arc length is increased
d. increase the penetration of the weld when the arc length is increased - ANSWERSb.
increase the penetration of the weld when the arc length is decreased
The function of the ingredients within the electrode coating of SMAW electrodes is to:
a. provide gas shielding, provide slag cover, scavenge impurities, stabilize the arc and
adding alloy elements
b. aid in the weld metal wetting the base metal
c. reduce arc blow
d. conduct a portion of the arc current - ANSWERSA. Provide gas shielding, provide
slag cover, scavenge impurities, stabilize the arc and adding alloy elements
The electrodes represented by EXX15, EXX16, and EXX18 have _________as a major
ingredient in the coating.
a. limestone
b. cellulose
c. titania - ANSWERSa.limestone
The GMAW, FCAW and MCAW processes have these features in common.
a. Constant current power source and constant speed wire feeder
b. Constant voltage power source and constant speed wire feeder
c. Constant current power source and variable speed wire feeder
d. Constant voltage power source and variable speed wire feeder - ANSWERSb.
Constant voltage power source and constant speed wire feeder
The welding current in the GMAW process is determined by which of the following
variables?
a. Wire feed speed
b. Voltage
c. Contact tube to work distance
d. Arc travel speed - ANSWERSa. Wire feed speed
What are the two power source variables that can be used to control spatter in GMAW
short circuit transfer.
a. Voltage and current
b. Input voltage and number of phases
c. Arc force and static characteristic
d. Inductance and static characteristic - ANSWERSd. inductance and static
characteristic
Which of the GMAW metal transfer modes can be used to weld out of position?
a. Globular and spray
, b. Short circuit and pulsed
c. Short circuit and globular
d. Spray and pulsed - ANSWERSb. Short circuit and pulsed
The shielding gas used in the GMAW process to produce short circuit transfer is
a. argon
b. argon with 15% carbon dioxide
c. helium
d. carbon dioxide - ANSWERSd. Carbon dioxide
Which shielding gas produces the most pronounced finger penetration for the GMAW
process?
a. Argon with 2% oxygen
b. Argon with 5% carbon dioxide
c. Argon with 25% carbon dioxide
d. Carbon dioxide - ANSWERSa. Argon with 2% oxygen
Which of the following statements is INCORRECT?
a. At a specific welding current and wire size the FCAW process has a higher deposition
rate than the GMAW process.
b. It is easier to change the chemical composition of the weld with the FCAW process
compared to the GMAW process
c. Just a) above
d. a) and b) above - ANSWERSD
Which type of weld metal transfer is produced using 75% argon and 25% carbon
dioxide shielding gas using high currents and basic fluxed cored wires?
a. Spray
b. Globular
c. Short circuit
d. Dip - ANSWERSa. Spray
Compared with the FCAW process the MCAW process has the following features.
a. Higher deposition rates for the same electrode size and current
b. Typically only used in the flat and horizontal position
c. Higher productivity because there is only islanding slag produced
d. All of the above - ANSWERSd. All of the above
Worm tracks produced using the FCAW process can be avoided by
a. using carbon dioxide shielding gas
b. increasing the contact tube to work distance
c. decreasing current and voltage
d. all of the above - ANSWERSd. all of the above
The submerged arc welding process incorporates
a. a continuously fed tubular wire and a constant current power source and a buried arc
