Visual Testing (VT) Practice Exam 2025 - Free VT Exam Practice Questions and Study Guide

The discontinuity referred to, caused by the rupture of metal forged at improper temperatures, is best described as an internal burst. This phenomenon occurs when metal experiences internal stresses during forging, leading to a failure or rupture that originates from within the material. Improper temperature management can result in uneven material properties, which may cause vulnerabilities that manifest as bursts under pressure.

In contrast, the other terms have distinct meanings within the context of metal forging and defects. A pipe typically refers to a tubular defect in the material, often related to shrinkage. A seam can denote a type of defect that arises from poor welding or improper forging processes but does not specifically relate to internal ruptures. Cupping usually describes a deformation or distortion mechanism where the metal surface curves, which is not synonymous with internal ruptures or discontinuities. Therefore, ‘internal burst’ accurately captures the nature of the discontinuity resulting from inappropriate metal forging temperatures.