MIG WELDING TEST QUESTIONS AND ANSWERS 2025
What power source is required to perform GMAW (MIG) welding? - (ANSWER)DC constant potential -
voltage
What types of metal transfer are possible with GMAW (MIG) process when welding? - (ANSWER)Short
circuit, Globular, and Spray Transfer
List two advantages and two disadvantages of GMAW (MIG) welding. - (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? - (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? - (ANSWER)0.023, 0.030, 0.035, 0.045
What current and polarity is most commonly used when GMAW wedling? - (ANSWER)DC - direct current
reverse polarity
What type of current is not used when GMAW welding? - (ANSWER)Alternating Current (AC)
What does the term MIG stand for? - (ANSWER)Metal Inert Gas
What does the term GMAW stand for? - (ANSWER)Gas Metal Arc Welding
What is the purpose of a shielding gas when GMAW? - (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
What power source is required to perform GMAW (MIG) welding? - (ANSWER)DC constant potential -
voltage
What types of metal transfer are possible with GMAW (MIG) process when welding? - (ANSWER)Short
circuit, Globular, and Spray Transfer
List two advantages and two disadvantages of GMAW (MIG) welding. - (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? - (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? - (ANSWER)0.023, 0.030, 0.035, 0.045
What current and polarity is most commonly used when GMAW wedling? - (ANSWER)DC - direct current
reverse polarity
What type of current is not used when GMAW welding? - (ANSWER)Alternating Current (AC)
What does the term MIG stand for? - (ANSWER)Metal Inert Gas
What does the term GMAW stand for? - (ANSWER)Gas Metal Arc Welding
What is the purpose of a shielding gas when GMAW? - (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
