MIG Welding Exam Questions and
Answers 100% Pass
Incomplete fusion - ✔✔a weld discontinuity in which fusion did not occur between
weld metal and fusion faces or adjoining weld beads
Duty Cycle - ✔✔The percentage of time during an arbitrary test period that a power
source or its accessories can be operated at rated output without overheating
arc voltage - ✔✔the voltage across the welding arc
Root reinforcement - ✔✔weld reinforcement opposite the side from which welding was
done
Filler metal - ✔✔The metal or alloy to bearded in making a brazed, soldered, or welded
joint
undercut - ✔✔a groove melted into the base metal adjacent to the weld toe or weld root
and left unfilled by weld metal
crater - ✔✔a depression in the weld face at the termination of a weld bead
lap joint - ✔✔a joint between 2 overlapping members in parallel planes
complete fusion - ✔✔fusion over the entire fusion faces and between all adjoining weld
beads
COPYRIGHT © 2025 BY KATELYN WHITMAN, ALL RIGHTS RESERVED 1
, tack weld - ✔✔a weld made to hold the parts of a weldment in proper alignment until
the final welds are made
gas nozzle - ✔✔a device at the end of the torch or gun that directs shielding gas
Root opening - ✔✔a separation at the joint root between the work pieces
Reinforcement - ✔✔weld reinforcement on the side of the joint from which welding was
done
contact tube - ✔✔a device which transfers current to a continuous electrode
spatter - ✔✔the metal particles expelled during fusion welding that do not form a part
of the weld
deposited metal - ✔✔filler metal that has been added during a welding operation
porosity - ✔✔cavity type discontinuities formed by gas entrapment during
solidification
base metal - ✔✔the metal or alloy that is to be weld, brazed, soldered or cut
gas regulator - ✔✔a device for controlling the device of gas at some substantially
constant pressure
direct current electrode positive (DCEP) - ✔✔The arrangement of direct current arc
welding leads in which the electrode is the positive pole and the work piece is the
negative pole of the welding arc
inert gas - ✔✔the gas the normally does not combine chemically with materials
Drag - ✔✔the travel angle when the electrode is pointing away from the direction of
travel
Fillet weld leg - ✔✔The distance from the joint root to the tow of the fillet weld
COPYRIGHT © 2025 BY KATELYN WHITMAN, ALL RIGHTS RESERVED 2
Answers 100% Pass
Incomplete fusion - ✔✔a weld discontinuity in which fusion did not occur between
weld metal and fusion faces or adjoining weld beads
Duty Cycle - ✔✔The percentage of time during an arbitrary test period that a power
source or its accessories can be operated at rated output without overheating
arc voltage - ✔✔the voltage across the welding arc
Root reinforcement - ✔✔weld reinforcement opposite the side from which welding was
done
Filler metal - ✔✔The metal or alloy to bearded in making a brazed, soldered, or welded
joint
undercut - ✔✔a groove melted into the base metal adjacent to the weld toe or weld root
and left unfilled by weld metal
crater - ✔✔a depression in the weld face at the termination of a weld bead
lap joint - ✔✔a joint between 2 overlapping members in parallel planes
complete fusion - ✔✔fusion over the entire fusion faces and between all adjoining weld
beads
COPYRIGHT © 2025 BY KATELYN WHITMAN, ALL RIGHTS RESERVED 1
, tack weld - ✔✔a weld made to hold the parts of a weldment in proper alignment until
the final welds are made
gas nozzle - ✔✔a device at the end of the torch or gun that directs shielding gas
Root opening - ✔✔a separation at the joint root between the work pieces
Reinforcement - ✔✔weld reinforcement on the side of the joint from which welding was
done
contact tube - ✔✔a device which transfers current to a continuous electrode
spatter - ✔✔the metal particles expelled during fusion welding that do not form a part
of the weld
deposited metal - ✔✔filler metal that has been added during a welding operation
porosity - ✔✔cavity type discontinuities formed by gas entrapment during
solidification
base metal - ✔✔the metal or alloy that is to be weld, brazed, soldered or cut
gas regulator - ✔✔a device for controlling the device of gas at some substantially
constant pressure
direct current electrode positive (DCEP) - ✔✔The arrangement of direct current arc
welding leads in which the electrode is the positive pole and the work piece is the
negative pole of the welding arc
inert gas - ✔✔the gas the normally does not combine chemically with materials
Drag - ✔✔the travel angle when the electrode is pointing away from the direction of
travel
Fillet weld leg - ✔✔The distance from the joint root to the tow of the fillet weld
COPYRIGHT © 2025 BY KATELYN WHITMAN, ALL RIGHTS RESERVED 2
