CWB Level 2 Closed Book
1. An arc plasma consists of: free electrons and positive ions.
2. Which of the following welding processes is the most
commonly used?: Arc
Welding
3. The most arc efficient welding process is the
process.: SAW
4. Which two areas represent the largest voltage drop in a
welding arc?: Cath- ode drop zone and Anode drop zone
5. The pinch force that aids in droplet detachment during
spray transfer is produced by: a self—induced magnetic field
6. Which of the following welding processes produces the
least hydrogen weld metal content?
a. SMAW b. GTAW c. SAW
d. FCAW: B. GTAW
7. he majority of the arc energy is transferred to the work when
the GTAW
process is operated inpolarity. a. AC
b. DCEP
c. DCEN: C. DCEN
,8. Modern inverter GTAW power sources use all methods for
arc starting, except for?
a. Scratch
b. High Frequency c. Steel Wool
d. Electronic Touch: c. Steel Wool
9. he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced: DCEN
10. 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: b. increase the penetration of the weld when the arc
length is decreased
,11. 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: A. Provide gas
shielding, provide slag cover, scavenge impurities, stabilize the
arc and adding alloy elements
12. The electrodes represented by EXX15, EXX16, and EXX18
have
as a major ingredient in the coating. a. limestone
b. cellulose
c. titania: a.limestone
13. 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: b. Constant voltage power source and constant speed
wire feeder
14. 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: a. Wire feed speed
15. 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: d. inductance and static
characteristic
16. 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: b. Short circuit and pulsed
17. The shielding gas used in the GMAW process to produce
short circuit transfer is
a. argon
1. An arc plasma consists of: free electrons and positive ions.
2. Which of the following welding processes is the most
commonly used?: Arc
Welding
3. The most arc efficient welding process is the
process.: SAW
4. Which two areas represent the largest voltage drop in a
welding arc?: Cath- ode drop zone and Anode drop zone
5. The pinch force that aids in droplet detachment during
spray transfer is produced by: a self—induced magnetic field
6. Which of the following welding processes produces the
least hydrogen weld metal content?
a. SMAW b. GTAW c. SAW
d. FCAW: B. GTAW
7. he majority of the arc energy is transferred to the work when
the GTAW
process is operated inpolarity. a. AC
b. DCEP
c. DCEN: C. DCEN
,8. Modern inverter GTAW power sources use all methods for
arc starting, except for?
a. Scratch
b. High Frequency c. Steel Wool
d. Electronic Touch: c. Steel Wool
9. he highest deposition rate in the SMAW process occurs in
a. DCEN
b. DCEP
c. AC
d. AC unbalanced: DCEN
10. 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: b. increase the penetration of the weld when the arc
length is decreased
,11. 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: A. Provide gas
shielding, provide slag cover, scavenge impurities, stabilize the
arc and adding alloy elements
12. The electrodes represented by EXX15, EXX16, and EXX18
have
as a major ingredient in the coating. a. limestone
b. cellulose
c. titania: a.limestone
13. 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: b. Constant voltage power source and constant speed
wire feeder
14. 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: a. Wire feed speed
15. 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: d. inductance and static
characteristic
16. 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: b. Short circuit and pulsed
17. The shielding gas used in the GMAW process to produce
short circuit transfer is
a. argon
