DCEN is used for most GMAW applications.

• A. True
• B. False
• C. Depends on current
• D. Depends on arc length

Answer: (B)

Polarity in GMAW affects where heat is concentrated and how the metal transfers across the arc. For most MIG welding with solid wire and shielding gas, the electrode is positive (DCEP), which gives a stable arc, good penetration, and compatibility with the common transfer modes used in typical applications. That’s why the statement is not correct. There are situations where electrode negative is chosen to alter heat input or transfer behavior for thin materials or specific wire types, but those are exceptions rather than the norm.