What does the term "overlay" refer to in structural repair?

The term "overlay" in structural repair specifically refers to the process of adding new material over damaged areas to provide reinforcement. This technique is commonly used to enhance the strength and durability of a structure, especially in places where the original material may have degraded or been compromised due to wear, environmental factors, or mechanical stress. By applying an overlay, technicians can effectively restore the integrity of the structure without the need to completely replace damaged components. This method not only saves time and expenses but also extends the lifecycle of the existing materials.

Removing excess material, applying paint, or welding sections do not encompass the fundamental definition of "overlay" as they involve different procedures aimed at either preparation, finishing, or joining components rather than specifically enhancing structural integrity through additional material. Thus, understanding the role and definition of an overlay is crucial in structural repair practices, emphasizing its importance in maintaining safety and performance in engineering applications.