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MIG WELDING TEST QUESTIONS AND
ANSWERS 2025
What power source is required to perform GMAW (MIG)
welding? - correct answer- DC constant potential - voltage
What types of metal transfer are possible with GMAW (MIG)
process when welding? - correct answer- Short circuit,
Globular, and Spray Transfer
List two advantages and two disadvantages of GMAW (MIG)
welding. - correct answer- Advantages: higher production rate,
faster welding speed
Disadvantages: less portable, requires more operator skills and
techniques for welding and equipment setup
What is the main function of the contact tip in a MIG welding
gun? - correct answer- Relay welding currents from the power
source to the filler metal (guide the filler metal to work piece)
Which diameters of wire sizes are most commonly used in
short circuit metal transfer when MIG circuit metal transfer
when MIG welding? - correct answer- 0.023, 0.030, 0.035,
0.045
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What current and polarity is most commonly used when GMAW
wedling? - correct answer- DC - direct current reverse polarity
What type of current is not used when GMAW welding? -
correct answer- Alternating Current (AC)
What does the term MIG stand for? - correct answer- Metal
Inert Gas
What does the term GMAW stand for? - correct answer- Gas
Metal Arc Welding
What is the purpose of a shielding gas when GMAW? - correct
answer- 1) To prevent contamination of the weld metal
2) To influence the welding arc and effects the width and depth
of weld penetration and amount of spatter
On a GMAW welding setup what causes the amperage to
increase or decrease? - correct answer- The dial on the wire
MIG WELDING TEST QUESTIONS AND
ANSWERS 2025
What power source is required to perform GMAW (MIG)
welding? - correct answer- DC constant potential - voltage
What types of metal transfer are possible with GMAW (MIG)
process when welding? - correct answer- Short circuit,
Globular, and Spray Transfer
List two advantages and two disadvantages of GMAW (MIG)
welding. - correct answer- Advantages: higher production rate,
faster welding speed
Disadvantages: less portable, requires more operator skills and
techniques for welding and equipment setup
What is the main function of the contact tip in a MIG welding
gun? - correct answer- Relay welding currents from the power
source to the filler metal (guide the filler metal to work piece)
Which diameters of wire sizes are most commonly used in
short circuit metal transfer when MIG circuit metal transfer
when MIG welding? - correct answer- 0.023, 0.030, 0.035,
0.045
, 2 | Page
What current and polarity is most commonly used when GMAW
wedling? - correct answer- DC - direct current reverse polarity
What type of current is not used when GMAW welding? -
correct answer- Alternating Current (AC)
What does the term MIG stand for? - correct answer- Metal
Inert Gas
What does the term GMAW stand for? - correct answer- Gas
Metal Arc Welding
What is the purpose of a shielding gas when GMAW? - correct
answer- 1) To prevent contamination of the weld metal
2) To influence the welding arc and effects the width and depth
of weld penetration and amount of spatter
On a GMAW welding setup what causes the amperage to
increase or decrease? - correct answer- The dial on the wire
