Visual Testing (VT) Practice Exam

A non-fusion discontinuity located at the root area of a welded joint is called what?

1. Porosity

2. Hot tear

3. Incomplete joint penetration

4. All of the above

The correct answer is: Incomplete joint penetration

The term that describes a non-fusion discontinuity located at the root area of a welded joint is 'incomplete joint penetration.' This refers specifically to a situation where the weld does not adequately fill the root area, leaving a gap or void that can compromise the strength and integrity of the weld. This condition is significant because it can lead to reduced mechanical properties and potential failure in the welded structure. It highlights the importance of ensuring that the welding process is performed correctly to achieve proper penetration into the base material. The focus on incomplete joint penetration emphasizes the need for proper welding techniques and inspections to ensure that the weld meets engineering requirements and standards. While porosity and hot tears are also types of discontinuities found in welded joints, they are not specifically related to the root area in the same way that incomplete joint penetration is. Porosity refers to gas bubbles trapped in the weld, and hot tears pertain to cracking that occurs while the weld is cooling. Therefore, these terms, while relevant to welding quality, do not apply to the specific condition of a non-fusion discontinuity at the root area like incomplete joint penetration does.