What type of joint configuration forms a 90-degree angle between two pieces?

The correct choice is the one that defines a corner joint, which is formed when two pieces of material intersect at a 90-degree angle, creating a corner arrangement. This joint is commonly used in various structural and fabrication applications where parts need to be joined at right angles.

Corner joints provide strong connections in frameworks, allowing for efficient load transfer. They are typically welded at the edges where the parts meet, ensuring durability and stability. Understanding these joint configurations is crucial for achieving precise alignments and the desired mechanical characteristics in welded assemblies.

In contrast to corner joints, other joint types, such as edge joints, butt joints, and T-joints, have different configurations and applications. Edge joints involve joining two pieces along their edges, butt joints require the pieces to be aligned face-to-face, and T-joints connect one piece perpendicular to the center of another, rather than forming a clear corner. Each type serves specific purposes in welding practice, highlighting the importance of selecting the appropriate joint based on the project requirements.