Gas Metal Arc Welding Exam Questions and Answers Latest Update 2025 Rated 100%
What does the term GMAW identify? - Answers Gas metal arc welding
Why is the term GMAW preferred over MIG or MAG? - Answers These terms are quite restrictive and
often technically incorrect
Give a brief description of the GMAW process: - Answers Welding process that joins metals by heating
them with an electric arc
What is the purpose of the shielding gas used in GMAW? - Answers Shielding the molten weld metal
from atmospheric contamination
What current and polarity is generally used with GMAW? - Answers DCEP (Direct Current Electrode
Positive)
Reverse Polarity
List several industries that would use GMAW: - Answers Pressure vessels and the piping industry
List the basic equipment requirements for the GMAW process: - Answers Power source, wire feeder,
welding gun,
Spooled filler wire, Shielding gas, and a ground
What power sources are used with the GMAW Process? - Answers Motor driven generators
Transformer rectifiers
and Inverter designs
What does the wire feeder control? - Answers speed of the feed motor and,
starting / stopping electrode feed
What is another term for electrode holders for GMAW? - Answers Guns
What 2 organizations designate specifications for GMAW wires? - Answers AWS and CSA
What is the purpose of a regulator and what does it indicate on its gauges? - Answers Reducing the gas
source pressure to a constant working pressure
What does a flowmeter do and what does it measure? - Answers controls the rate of flow of a shielding
gas to the gun nozzle
List the three methods of metal transfer with GMAW: - Answers Short-circuiting transfer
Globular transfer
, Spray transfer
List the factors that determine the mode of metal transfer: - Answers Welding Current
Filler wire diameter
arc length
type of shielding
position of the weld
Give a description of "pinch effect": - Answers Molten metal is separated from the end of the filler wire
by a squeezing force created by a magnetic field
What is the required arc voltage used for short circuit transfer? - Answers 12 to 22 arc volts
When is the metal transferred with short circuit transfer? - Answers When the filler wire is in direct
contract with the base metal
How many times per second does short circuiting take place? - Answers 20 to 200 times per second
What is the key advantage of short circuiting transfer? - Answers Minimum distortion due to low heat
input
Why is globular transfer generally avoided with GMAW? - Answers Spatter problems and poor weld
appearance
What is the minimum % value of argon that must be present to use the spray
transfer method of GMAW? - Answers 85%
Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer? - Answers
Higher
26 to 35 arc volts
What is an advantage of pulsed arc transfer with GMAW? - Answers Heat input is less than spray
transfer, resulting in less distortion
Used in all positions due to controlling the weld metal freeze
Describe spray transfer: - Answers ...
What does the abbreviation NEMA stand for? - Answers National Electrical Manufactures Association
Explain the term "duty cycle" and how does it relate to welding power sources? - Answers Duty cycle is a
10 minute cycle of welding time vs cooling time a given machine can handle.
What does the term GMAW identify? - Answers Gas metal arc welding
Why is the term GMAW preferred over MIG or MAG? - Answers These terms are quite restrictive and
often technically incorrect
Give a brief description of the GMAW process: - Answers Welding process that joins metals by heating
them with an electric arc
What is the purpose of the shielding gas used in GMAW? - Answers Shielding the molten weld metal
from atmospheric contamination
What current and polarity is generally used with GMAW? - Answers DCEP (Direct Current Electrode
Positive)
Reverse Polarity
List several industries that would use GMAW: - Answers Pressure vessels and the piping industry
List the basic equipment requirements for the GMAW process: - Answers Power source, wire feeder,
welding gun,
Spooled filler wire, Shielding gas, and a ground
What power sources are used with the GMAW Process? - Answers Motor driven generators
Transformer rectifiers
and Inverter designs
What does the wire feeder control? - Answers speed of the feed motor and,
starting / stopping electrode feed
What is another term for electrode holders for GMAW? - Answers Guns
What 2 organizations designate specifications for GMAW wires? - Answers AWS and CSA
What is the purpose of a regulator and what does it indicate on its gauges? - Answers Reducing the gas
source pressure to a constant working pressure
What does a flowmeter do and what does it measure? - Answers controls the rate of flow of a shielding
gas to the gun nozzle
List the three methods of metal transfer with GMAW: - Answers Short-circuiting transfer
Globular transfer
, Spray transfer
List the factors that determine the mode of metal transfer: - Answers Welding Current
Filler wire diameter
arc length
type of shielding
position of the weld
Give a description of "pinch effect": - Answers Molten metal is separated from the end of the filler wire
by a squeezing force created by a magnetic field
What is the required arc voltage used for short circuit transfer? - Answers 12 to 22 arc volts
When is the metal transferred with short circuit transfer? - Answers When the filler wire is in direct
contract with the base metal
How many times per second does short circuiting take place? - Answers 20 to 200 times per second
What is the key advantage of short circuiting transfer? - Answers Minimum distortion due to low heat
input
Why is globular transfer generally avoided with GMAW? - Answers Spatter problems and poor weld
appearance
What is the minimum % value of argon that must be present to use the spray
transfer method of GMAW? - Answers 85%
Is the arc voltage for spray transfer higher or lower than that used for short circuit transfer? - Answers
Higher
26 to 35 arc volts
What is an advantage of pulsed arc transfer with GMAW? - Answers Heat input is less than spray
transfer, resulting in less distortion
Used in all positions due to controlling the weld metal freeze
Describe spray transfer: - Answers ...
What does the abbreviation NEMA stand for? - Answers National Electrical Manufactures Association
Explain the term "duty cycle" and how does it relate to welding power sources? - Answers Duty cycle is a
10 minute cycle of welding time vs cooling time a given machine can handle.
