GMA Welding For Collision Repair Welding Practice Test

Which of the following is a valid visual criterion to inspect in a MIG weld on a vehicle panel?

Weld throat thickness Brand of filler wire Color of primer Vehicle model

Correct Answer:

Weld throat thickness

Explanation:

Visual checks for a MIG weld focus on the size and consistency of the weld as it appears on the panel. The throat thickness is the crucial measure—the shortest distance from the weld root to the face of the weld along the cross-section. It directly reflects how much weld metal has filled between the panels and, when compared to the specified weld size, indicates whether the joint has enough fusion and strength. The other items don’t provide a reliable visual indicator of weld quality: the brand of filler wire doesn’t tell you about the actual weld appearance or penetration, the color of primer is just a coating and can conceal issues, and the vehicle model has no bearing on how well the weld was made.

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