The backside of a fillet weld should show evidence of penetration in the form of what term?

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Study for the GMA Welding for Collision Repair. Prepare with multiple-choice questions, flashcards, hints, and detailed explanations. Enhance your skills and confidently tackle your exam!

Multiple Choice

The backside of a fillet weld should show evidence of penetration in the form of what term?

Explanation:
Melt-through is the signal that penetration has reached through the joint. When the weld metal has fused completely through to the opposite side, you can see or feel that material on the backside, indicating through-thickness penetration. Cracks, porosity, and undercut are different defects: cracks are fractures, porosity are gas pockets in the weld, and undercut is a groove along the weld toe that weakens the joint but doesn’t prove penetration through the joint.

Melt-through is the signal that penetration has reached through the joint. When the weld metal has fused completely through to the opposite side, you can see or feel that material on the backside, indicating through-thickness penetration. Cracks, porosity, and undercut are different defects: cracks are fractures, porosity are gas pockets in the weld, and undercut is a groove along the weld toe that weakens the joint but doesn’t prove penetration through the joint.

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