Visual Testing (VT) Practice Exam

What describes weld metal that completely fills the groove and is fused to the base metal throughout its total thickness?

1. Partial joint penetration

2. Plate thickness

3. Theoretical throat

4. Complete joint penetration

The correct answer is: Complete joint penetration

The description provided pertains specifically to weld metal that fills the groove entirely and is thoroughly fused with the base metal across its full thickness. This characteristic is accurately captured by the term "complete joint penetration." In welding, achieving complete joint penetration indicates that the weld has penetrated entirely through the thickness of the joint, ensuring a strong bond between the two pieces of metal. This is essential in applications where structural integrity and load-bearing capabilities are crucial. When the weld metal fills the groove and bonds perfectly with both sides, it creates a continuous, solid joint that can withstand higher stresses compared to joints that do not achieve this level of penetration. In contrast, partial joint penetration refers to scenarios where the weld does not penetrate fully through the thickness of the joint, which would not meet the criteria mentioned in the question. Similarly, terms like plate thickness and theoretical throat relate to measurements and dimensions of the weld and joint, rather than indicating the degree of penetration and the vitality of the weld joint itself. Therefore, complete joint penetration is the correct term as it decisively meets the criteria of fully filling the groove and fusing with the base metal throughout its entire thickness.