What is a butt joint?

A butt joint is correctly defined as two ends joined together, which means that the edges of two pieces of material are aligned and connected without any overlap. This type of joint is commonly used in various construction and engineering applications, especially in the assembly of structural components.

In contrast to the other types of joints mentioned, a butt joint does not involve overlapping plates or rivets, nor does it rely on welding. Each of those alternative methods serves specific purposes in different contexts, such as providing additional strength or resisting forces in a structure. However, the distinct characteristic of a butt joint is its simplicity, where the pieces are placed end-to-end, making it a foundational technique in many piping and structural assemblies. This helps to understand its straightforward use in scenarios where a smooth, flush finish is desired.