GMA Welding For Collision Repair Welding Practice Test

For collision repairs, which polarity is used most often?

Reverse Straight Pulsed Neutral

Correct Answer:

Reverse

Explanation:

In MIG welding for collision repairs on steel, the common choice is reverse polarity (electrode positive). This setup drives more heat into the weld zone and base metal, which promotes better fusion and deeper penetration for joints and patch replacements. That reliable heat transfer helps ensure strong, consistent welds on automotive panels using the typical solid wire and shielding gas combinations. Straight polarity (electrode negative) is used less often for steel MIG because it produces less heat in the weld zone, which can mean shallower penetration and weaker fusion for typical repair joints. Pulsed describes a current waveform, not a polarity, and neutral isn’t a standard MIG polarity, so those options don’t reflect the usual practice.

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