MIG Welding Questions and Answers
Already Passed
What is the primary function of the shielding gas in MIG welding?
The shielding gas protects the weld from atmospheric contamination, ensuring a clean weld
pool.
How does the wire feed speed impact the MIG welding process?
The wire feed s...
MIG Welding Questions and Answers
Already Passed
What is the primary function of the shielding gas in MIG welding?
✔✔The shielding gas protects the weld from atmospheric contamination, ensuring a clean weld
pool.
How does the wire feed speed impact the MIG welding process?
✔✔The wire feed speed controls the amount of filler metal, influencing weld penetration and
bead size.
What type of polarity is commonly used in MIG welding?
✔✔Direct Current Electrode Positive (DCEP) is commonly used, which allows for deeper
penetration and smoother welds.
What is the role of the contact tip in MIG welding?
✔✔The contact tip transfers the electrical current to the welding wire, creating the arc necessary
for welding.
1
, Why is maintaining the correct torch angle important in MIG welding?
✔✔The correct torch angle ensures proper penetration, reduces spatter, and produces a uniform
bead.
What could cause excessive spatter during MIG welding?
✔✔Excessive spatter can be caused by incorrect voltage settings, improper wire feed speed, or
poor gas coverage.
How do different shielding gases affect MIG weld quality?
✔✔Argon provides a smooth arc and is used for non-ferrous metals, while CO2 offers deeper
penetration but can create more spatter.
Why is it important to clean the base metal before MIG welding?
✔✔Cleaning the base metal removes contaminants like oil, rust, or paint, which can weaken the
weld and cause defects.
What is the function of the drive rollers in a MIG welding machine?
✔✔The drive rollers feed the wire through the gun to maintain a steady flow of filler material
into the weld pool.
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