A concave root surface (suck back) occurs when the back side of the root weld is what?

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Prepare for the GTAW Advanced Welding Exam. Use flashcards and multiple choice questions, each with hints and detailed explanations. Excel in the exam!

Multiple Choice

A concave root surface (suck back) occurs when the back side of the root weld is what?

Explanation:
Suck-back shows up as a concave root surface because the molten metal in the root pool pulls away from the back side as it solidifies, leaving a dip or dish-shaped recess along the backside. That concave shape is the telltale sign of suck-back, indicating the back edge of the root weld recoils inward. If the back side were bulging outward, it would be a convex root; a perfectly balanced root would appear flat, and an angled back side would show asymmetric contour from improper travel or fit. So the characteristic concave back side corresponds to the concave root surface.

Suck-back shows up as a concave root surface because the molten metal in the root pool pulls away from the back side as it solidifies, leaving a dip or dish-shaped recess along the backside. That concave shape is the telltale sign of suck-back, indicating the back edge of the root weld recoils inward. If the back side were bulging outward, it would be a convex root; a perfectly balanced root would appear flat, and an angled back side would show asymmetric contour from improper travel or fit. So the characteristic concave back side corresponds to the concave root surface.

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