MIG Welding Test Questions and Answers Already Passed
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Course
MIG Welding
Institution
MIG Welding
MIG Welding Test Questions and
Answers Already Passed
What is the primary shielding gas used in MIG welding?
Argon or a mixture of Argon and Carbon Dioxide is commonly used for shielding in MIG
welding.
Why is the wire feed speed critical in MIG welding?
The wire feed speed controls the a...
MIG Welding Test Questions and
Answers Already Passed
What is the primary shielding gas used in MIG welding?
✔✔Argon or a mixture of Argon and Carbon Dioxide is commonly used for shielding in MIG
welding.
Why is the wire feed speed critical in MIG welding?
✔✔The wire feed speed controls the amount of filler material deposited and directly impacts the
weld’s quality and penetration.
How does improper voltage affect a MIG weld?
✔✔Too high voltage can cause excessive spatter and a flat bead, while too low voltage can result
in poor penetration and an inconsistent weld.
What is the significance of maintaining a proper work angle in MIG welding?
✔✔The correct work angle ensures even heat distribution and prevents weld defects like
undercut or poor penetration.
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, How does wire diameter influence the weld outcome in MIG welding?
✔✔A larger diameter wire deposits more material and requires higher amperage, while a smaller
wire is suited for thinner materials and finer welds.
What causes porosity in a MIG weld?
✔✔Porosity is caused by gas entrapment due to contamination, improper gas flow, or drafts in
the welding environment.
Why is it important to clean the base metal before starting a MIG weld?
✔✔Removing contaminants like rust, oil, and paint prevents weld defects such as porosity and
poor fusion.
How does travel speed affect the MIG welding process?
✔✔Too fast travel speed can cause poor penetration, while too slow can lead to excessive heat
input and a wide, flat bead.
What is the purpose of the contact tip in MIG welding?
✔✔The contact tip delivers the welding current to the wire, which creates the arc needed for
welding.
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