CWB Level 2 Closed Book Questions
and Accurate Detailed Answers
An arc plasma consists of - Answer: free electrons and positive ions.
Which of the following welding processes is the most commonly used? - Answer: Arc Welding
The most arc efficient welding process is the _______ process. - Answer: SAW
Which two areas represent the largest voltage drop in a welding arc? - Answer: Cathode drop zone
and Anode drop zone
The pinch force that aids in droplet detachment during spray transfer is produced by - Answer: a 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 - Answer: B. 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 - Answer: C. 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 - Answer: c. Steel Wool
he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced - Answer: DCEN
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 - Answer: b. 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 - Answer: A. 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 - Answer: a.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 - Answer: b. 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 - Answer: a. 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 - Answer: d. 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 - Answer: b. 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 - Answer: d. 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
and Accurate Detailed Answers
An arc plasma consists of - Answer: free electrons and positive ions.
Which of the following welding processes is the most commonly used? - Answer: Arc Welding
The most arc efficient welding process is the _______ process. - Answer: SAW
Which two areas represent the largest voltage drop in a welding arc? - Answer: Cathode drop zone
and Anode drop zone
The pinch force that aids in droplet detachment during spray transfer is produced by - Answer: a 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 - Answer: B. 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 - Answer: C. 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 - Answer: c. Steel Wool
he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced - Answer: DCEN
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 - Answer: b. 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 - Answer: A. 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 - Answer: a.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 - Answer: b. 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 - Answer: a. 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 - Answer: d. 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 - Answer: b. 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 - Answer: d. 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
