In a groove weld, which term describes the minimum distance between the weld face and the root?

In a groove weld, which term describes the minimum distance between the weld face and the root?

• A. Root opening
• B. Groove width
• C. Throat
• D. Weld toe

Answer: (C)

In groove welds, the essential dimension is the throat—the minimum distance from the weld face to the root. This thickness is the critical cross-section that carries shear and determines the weld’s strength, so it’s the defining measure of the weld’s effective size. This is different from the root opening (the gap at the root), groove width (the mouth size of the groove at the surface), and the weld toe (where the weld face meets the base metal).

In groove welds, the essential dimension is the throat—the minimum distance from the weld face to the root. This thickness is the critical cross-section that carries shear and determines the weld’s strength, so it’s the defining measure of the weld’s effective size. This is different from the root opening (the gap at the root), groove width (the mouth size of the groove at the surface), and the weld toe (where the weld face meets the base metal).