Visual Testing (VT) Practice Exam

What is a folded thin flap of metal usually referred to in the context of a forging?

1. Forging porosity.

2. A cold shut.

3. A crack.

4. A surface lap.

The correct answer is: A surface lap.

In the context of forging, a folded thin flap of metal is best described as a surface lap. A surface lap occurs when the metal surfaces do not fully fuse during the forging process, resulting in overlapping layers. This phenomenon can compromise the integrity of the forged piece, making it crucial to identify and address. By understanding the characteristics of a surface lap, one can effectively differentiate it from other issues that may arise during forging. Forging porosity refers to voids or cavities within the metal that may affect its strength, while a cold shut describes a non-fusion area where the metal cools before the two sections completely join, resulting in a flaw but not necessarily a folded flap. Cracks indicate structural failure, which is more severe than simply having a fold of metal. Recognizing these distinctions is essential in quality control and ensuring that forged components are reliable and meet required standards.